nagendra babu - Academia.edu (original) (raw)
Papers by nagendra babu
RSC Advances, 2015
nZVI (11.8 ± 0.2% w/w) immobilized on microcrystalline cellulose (C-nZVI) shows unusual Cr(vi) ad... more nZVI (11.8 ± 0.2% w/w) immobilized on microcrystalline cellulose (C-nZVI) shows unusual Cr(vi) adsorption (562.8 mg g−1of nZVI) as a consequence ofin situregeneration of nZVI upon oxidation of cellulose to cellulose dialdehyde.
Journal of Soils and Sediments, 2015
Purpose Arsenic (As) contamination of groundwater has received significant attention recently in ... more Purpose Arsenic (As) contamination of groundwater has received significant attention recently in district Bathinda, due to consequent health risk in this region. Soil is the one of the primary medium for arsenic transport to groundwater. Thus, there is an essential requirement for understanding the retention capacity and mobility of arsenic in the soils to ensure sustainability of the groundwater in the locality. Arsenic interaction with various physicochemical properties of soil would provide a better understanding of its leaching from the soil. Materials and methods Fifty-one soil samples were collected from two regions of Bathinda district with extensive agricultural practices, namely, Talwandi Sabo and Goniana. The soils were analyzed for arsenic content and related physicochemical characteristic of the soil which influence arsenic mobility in soil. Adsorption studies were carried out to identify the arsenic mobilization characteristic of the soil. SEM-EDX and sequential extraction of arsenic adsorbed soil samples affirmed the arsenic adsorption and its mobility in soil, respectively. Multiple regression models have been formulated for meaningful soil models for the prediction of arsenic transport behavior and understand the adsorption and mobilization of arsenic in the soil matrices. Results and discussion Region-wise analysis showed elevated levels of arsenic in the soil samples from Goniana region (mean 9.58 mg kg −1) as compared to Talwandi Sabo block (mean 3.38 mg kg −1). Selected soil samples were studied for As(V) and As(III) adsorption behavior. The characteristic arsenic adsorption by these soil samples fitted well with Langmuir, Freundlich, Temkin, and D-R isotherm with a q max in the range of 45 to 254 mg kg −1 and 116 to 250 mg kg −1 for As(III) and As(V), respectively. Adsorption isotherms indicate weak arsenic retention capacity of the soil, which is attributed to the sandy loam textured soil and excessive fertilizer usage in this region. PCM and MLR analysis of the soil arsenic content and its adsorption strongly correlated with soil physicochemical parameters, namely, Mn, Fe, total/available phosphorus, and organic matter. Conclusions Manganese and iron content were firmly established for retention of arsenic in soil, whereas its mobility was influenced by organic matter and total/ available phosphorus. The poor adsorptive characteristic of these soils is the primary cause of higher arsenic concentration in groundwater of this region. A strong correlation between monitored arsenic and adsorbed As(III) with manganese suggests As(III) as the predominant species present in soil environment in this region.
Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ... more Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ionic liquid is currently being studied for future bioethanol from lignocellulosic biomass. Studies in the hydrolysis of cellulose in ionic liquid in binary mixture with water showed inhibitory effect of ionic liquid traces present in pretreated cellulose, on the biocatalytic hydrolysis by cellulase. Apart from this, biocatalytic hydrolysis had been studied in ionic liquid solution as a homogeneous conditions as a one-pot process for simultaneous pretreatment & hydrolysis. These process involved the study of biocatalytic hydrolysis in imidazolium based ionic liquids namely, [EMIM]OAc & [BMIM]Cl, as hydrophilic solvents. These solvents have anions with predominantly strong hydrogen bond acceptor groups. The study reveals the deactivation of the enzyme in presence of ionic liquids. Bose et al. (2010) have reported very good activity of cellulase in various ionic liquid including HEMA, but ...
Biosensors and Bioelectronics, 2015
Biosensors are analytical devices having high sensitivity, portability, small sample requirement ... more Biosensors are analytical devices having high sensitivity, portability, small sample requirement and ease of use for qualitative and quantitative monitoring of various analytes of human importance. Arsenic (As), owing to its widespread presence in nature and high toxicity to living creatures, requires frequent determination in water, soil, agricultural and food samples. The present review is an effort to highlight the various advancements made so far in the development of arsenic biosensors based either on recombinant whole cells or on certain arsenic-binding oligonucleotides or proteins. The role of futuristic approaches like surface plasmon resonance (SPR) and aptamer technology has also been discussed. The biomethods employed and their general mechanisms, advantages and limitations in relevance to arsenic biosensors developed so far are intended to be discussed in this review.
Ecological Engineering, 2015
ABSTRACT Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its mult... more ABSTRACT Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on- and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a by- product of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemicals and improves essential nutrient dynamics. Since the potential benefits of biochar in soil are governed by initial pyrolysis conditions and soil types; therefore, its wider utilization potential as suitable tool in sustainable agriculture and climate change mitigation needs to be critically analyzed before its specific recommendation to an agroecosystem. The present review provides a critical insight on current research on various aspects, particularly ecological, of crop residue biochar starting from the feedstock sources, pyrolysis conditions and changes after application. Additionally, a brief account is given on the agronomic relevance and major constraints of biochar amendment as an ecological engineering tool for sustainable agriculture. After reviewing various aspects of crop residue as feedstock, we recommend its use as a blend, rather than sole use, along with several other lignocellulosic materials under pyrolysis process as well as ameliorating agent.
Http Dx Doi Org 10 1080 19443994 2013 833554, Dec 1, 2014
Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 2010
Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformatio... more Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformation possessing imine units and bearing anthracene moieties have been synthesized by a 1 ? 2 Schiff base condensation in good yields and examined for their cation recognition abilities ...
Desalination and Water Treatment, Apr 22, 2015
Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ... more Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ionic liquid is currently being studied for future bioethanol from lignocellulosic biomass. Studies in the hydrolysis of cellulose in ionic liquid in binary mixture with water showed inhibitory effect of ionic liquid traces present in pretreated cellulose, on the biocatalytic hydrolysis by cellulase. Apart from this, biocatalytic hydrolysis had been studied in ionic liquid solution as a homogeneous conditions as a one-pot process for simultaneous pretreatment & hydrolysis. These process involved the study of biocatalytic hydrolysis in imidazolium based ionic liquids namely, [EMIM]OAc & [BMIM]Cl, as hydrophilic solvents. These solvents have anions with predominantly strong hydrogen bond acceptor groups. The study reveals the deactivation of the enzyme in presence of ionic liquids. Bose et al. (2010) have reported very good activity of cellulase in various ionic liquid including HEMA, but ...
Ecological Engineering, 2015
Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted ... more Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on-and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a byproduct of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemicals and improves essential nutrient dynamics. Since the potential benefits of biochar in soil are governed by initial pyrolysis conditions and soil types; therefore, its wider utilization potential as suitable tool in sustainable agriculture and climate change mitigation needs to be critically analyzed before its specific recommendation to an agroecosystem. The present review provides a critical insight on current research on various aspects, particularly ecological, of crop residue biochar starting from the feedstock sources, pyrolysis conditions and changes after application. Additionally, a brief account is given on the agronomic relevance and major constraints of biochar amendment as an ecological engineering tool for sustainable agriculture. After reviewing various aspects of crop residue as feedstock, we recommend its use as a blend, rather than sole use, along with several other lignocellulosic materials under pyrolysis process as well as ameliorating agent.
Biosensors and Bioelectronics, 2015
Talanta, 2010
Iminoazophenol appended calix[4]arene/thiacalix[4]arene derivatives 1 and 2 of cone and 3 of 1,3-... more Iminoazophenol appended calix[4]arene/thiacalix[4]arene derivatives 1 and 2 of cone and 3 of 1,3-alternate conformation have been synthesized and examined for their chromogenic anion recognition abilities towards different anions like fluoride, chloride, bromide, iodide, acetate, dihydrogenphosphate, nitrate and hydrogensulphate by UV-vis spectroscopy. Receptors 1-3 show an unusual red shift in UV-vis spectra upon binding with these anions, with a colour change visible to naked eye in case of fluoride, acetate and dihydrogenphosphate ions at lower concentration of anions. This red shift in the absorption spectra is accounted by anion complexation induced sigma-extended conjugation.
![Research paper thumbnail of Ratiometric/‘On–Off’ sensing of Pb2+ ion using pyrene-appended calix[4]arenes](https://attachments.academia-assets.com/53558975/thumbnails/1.jpg)
](Sensors and Actuators B: Chemical, 2010
New fluorescent sensors 6, 7 and 9 based on calix[4]arenes have been synthesized and examined for... more New fluorescent sensors 6, 7 and 9 based on calix[4]arenes have been synthesized and examined for their binding abilities towards different metal ions (Li + , Na + , K + , Pb 2+ , Zn 2+ , Hg 2+ and Ag + ) by UV and fluorescence spectroscopy. Two of these receptors (6 and 7) show ratiometric sensing while the third receptor (9) shows 'On-Off' signaling of Pb 2+ ion among the various metal ions tested. The stoichiometry of the complexation was found to be 1:1 as established by Job's plot.
Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2010
Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformatio... more Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformation possessing imine units and bearing anthracene moieties have been synthesized by a 1 ? 2 Schiff base condensation in good yields and examined for their cation recognition abilities ...
Dalton Transactions, 2010
Synthetic strategies are described to synthesize the calix[4]arene diamine 4 of partial cone (pac... more Synthetic strategies are described to synthesize the calix[4]arene diamine 4 of partial cone (paco) conformation, which on condensation with 9-anthracene carbaldehyde forms the chemosensor 5 in paco conformation. The chemosensor 5 undergoes fluorescence enhancement in the presence of Ni(2+) ions.
Journal of Inclusion Phenomena and …, 2002
... Printed in the Netherlands. 247 Synthesis of New Cryptands Containing 3,5-Disubstituted-1-Met... more ... Printed in the Netherlands. 247 Synthesis of New Cryptands Containing 3,5-Disubstituted-1-Methyl or 1-Hexadecyl-Pyrazole by [3+2] Condensation and Reduction MANOJ KUMAR1,VANDANA SHARMA (NEE Bhalla)2,∗ and J. NAGENDRA BABU1 ...
Applied Surface Science, 2014
Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted ... more Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on- and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a by- product of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemical...
Supramolecular Chemistry, Jan 1, 2007
A new chromogenic receptor based on 1, 2-phenylene derivative containing thiourea moieties is syn... more A new chromogenic receptor based on 1, 2-phenylene derivative containing thiourea moieties is synthesized and examined for its anion binding ability by UVVis and 1H NMR studies. The results show that the receptor has selective colorimetric sensing of fluoride ...
Cheminform, Jan 1, 2004
A facile synthesis of symmetrical and unsymmetrical ethers is achieved by reductive coupling of c... more A facile synthesis of symmetrical and unsymmetrical ethers is achieved by reductive coupling of carbonyl compounds with alkoxysilanes. This reaction is performed using inert polymethylhydrosiloxane as the hydride source and B(C 6 F 5 ) 3 as the catalytic activator of the PMHS.
RSC Advances, 2015
nZVI (11.8 ± 0.2% w/w) immobilized on microcrystalline cellulose (C-nZVI) shows unusual Cr(vi) ad... more nZVI (11.8 ± 0.2% w/w) immobilized on microcrystalline cellulose (C-nZVI) shows unusual Cr(vi) adsorption (562.8 mg g−1of nZVI) as a consequence ofin situregeneration of nZVI upon oxidation of cellulose to cellulose dialdehyde.
Journal of Soils and Sediments, 2015
Purpose Arsenic (As) contamination of groundwater has received significant attention recently in ... more Purpose Arsenic (As) contamination of groundwater has received significant attention recently in district Bathinda, due to consequent health risk in this region. Soil is the one of the primary medium for arsenic transport to groundwater. Thus, there is an essential requirement for understanding the retention capacity and mobility of arsenic in the soils to ensure sustainability of the groundwater in the locality. Arsenic interaction with various physicochemical properties of soil would provide a better understanding of its leaching from the soil. Materials and methods Fifty-one soil samples were collected from two regions of Bathinda district with extensive agricultural practices, namely, Talwandi Sabo and Goniana. The soils were analyzed for arsenic content and related physicochemical characteristic of the soil which influence arsenic mobility in soil. Adsorption studies were carried out to identify the arsenic mobilization characteristic of the soil. SEM-EDX and sequential extraction of arsenic adsorbed soil samples affirmed the arsenic adsorption and its mobility in soil, respectively. Multiple regression models have been formulated for meaningful soil models for the prediction of arsenic transport behavior and understand the adsorption and mobilization of arsenic in the soil matrices. Results and discussion Region-wise analysis showed elevated levels of arsenic in the soil samples from Goniana region (mean 9.58 mg kg −1) as compared to Talwandi Sabo block (mean 3.38 mg kg −1). Selected soil samples were studied for As(V) and As(III) adsorption behavior. The characteristic arsenic adsorption by these soil samples fitted well with Langmuir, Freundlich, Temkin, and D-R isotherm with a q max in the range of 45 to 254 mg kg −1 and 116 to 250 mg kg −1 for As(III) and As(V), respectively. Adsorption isotherms indicate weak arsenic retention capacity of the soil, which is attributed to the sandy loam textured soil and excessive fertilizer usage in this region. PCM and MLR analysis of the soil arsenic content and its adsorption strongly correlated with soil physicochemical parameters, namely, Mn, Fe, total/available phosphorus, and organic matter. Conclusions Manganese and iron content were firmly established for retention of arsenic in soil, whereas its mobility was influenced by organic matter and total/ available phosphorus. The poor adsorptive characteristic of these soils is the primary cause of higher arsenic concentration in groundwater of this region. A strong correlation between monitored arsenic and adsorbed As(III) with manganese suggests As(III) as the predominant species present in soil environment in this region.
Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ... more Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ionic liquid is currently being studied for future bioethanol from lignocellulosic biomass. Studies in the hydrolysis of cellulose in ionic liquid in binary mixture with water showed inhibitory effect of ionic liquid traces present in pretreated cellulose, on the biocatalytic hydrolysis by cellulase. Apart from this, biocatalytic hydrolysis had been studied in ionic liquid solution as a homogeneous conditions as a one-pot process for simultaneous pretreatment & hydrolysis. These process involved the study of biocatalytic hydrolysis in imidazolium based ionic liquids namely, [EMIM]OAc & [BMIM]Cl, as hydrophilic solvents. These solvents have anions with predominantly strong hydrogen bond acceptor groups. The study reveals the deactivation of the enzyme in presence of ionic liquids. Bose et al. (2010) have reported very good activity of cellulase in various ionic liquid including HEMA, but ...
Biosensors and Bioelectronics, 2015
Biosensors are analytical devices having high sensitivity, portability, small sample requirement ... more Biosensors are analytical devices having high sensitivity, portability, small sample requirement and ease of use for qualitative and quantitative monitoring of various analytes of human importance. Arsenic (As), owing to its widespread presence in nature and high toxicity to living creatures, requires frequent determination in water, soil, agricultural and food samples. The present review is an effort to highlight the various advancements made so far in the development of arsenic biosensors based either on recombinant whole cells or on certain arsenic-binding oligonucleotides or proteins. The role of futuristic approaches like surface plasmon resonance (SPR) and aptamer technology has also been discussed. The biomethods employed and their general mechanisms, advantages and limitations in relevance to arsenic biosensors developed so far are intended to be discussed in this review.
Ecological Engineering, 2015
ABSTRACT Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its mult... more ABSTRACT Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on- and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a by- product of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemicals and improves essential nutrient dynamics. Since the potential benefits of biochar in soil are governed by initial pyrolysis conditions and soil types; therefore, its wider utilization potential as suitable tool in sustainable agriculture and climate change mitigation needs to be critically analyzed before its specific recommendation to an agroecosystem. The present review provides a critical insight on current research on various aspects, particularly ecological, of crop residue biochar starting from the feedstock sources, pyrolysis conditions and changes after application. Additionally, a brief account is given on the agronomic relevance and major constraints of biochar amendment as an ecological engineering tool for sustainable agriculture. After reviewing various aspects of crop residue as feedstock, we recommend its use as a blend, rather than sole use, along with several other lignocellulosic materials under pyrolysis process as well as ameliorating agent.
Http Dx Doi Org 10 1080 19443994 2013 833554, Dec 1, 2014
Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 2010
Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformatio... more Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformation possessing imine units and bearing anthracene moieties have been synthesized by a 1 ? 2 Schiff base condensation in good yields and examined for their cation recognition abilities ...
Desalination and Water Treatment, Apr 22, 2015
Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ... more Ionic liquids have found many applications in biofuel strategy. The cellulose pretreatment using ionic liquid is currently being studied for future bioethanol from lignocellulosic biomass. Studies in the hydrolysis of cellulose in ionic liquid in binary mixture with water showed inhibitory effect of ionic liquid traces present in pretreated cellulose, on the biocatalytic hydrolysis by cellulase. Apart from this, biocatalytic hydrolysis had been studied in ionic liquid solution as a homogeneous conditions as a one-pot process for simultaneous pretreatment & hydrolysis. These process involved the study of biocatalytic hydrolysis in imidazolium based ionic liquids namely, [EMIM]OAc & [BMIM]Cl, as hydrophilic solvents. These solvents have anions with predominantly strong hydrogen bond acceptor groups. The study reveals the deactivation of the enzyme in presence of ionic liquids. Bose et al. (2010) have reported very good activity of cellulase in various ionic liquid including HEMA, but ...
Ecological Engineering, 2015
Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted ... more Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on-and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a byproduct of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemicals and improves essential nutrient dynamics. Since the potential benefits of biochar in soil are governed by initial pyrolysis conditions and soil types; therefore, its wider utilization potential as suitable tool in sustainable agriculture and climate change mitigation needs to be critically analyzed before its specific recommendation to an agroecosystem. The present review provides a critical insight on current research on various aspects, particularly ecological, of crop residue biochar starting from the feedstock sources, pyrolysis conditions and changes after application. Additionally, a brief account is given on the agronomic relevance and major constraints of biochar amendment as an ecological engineering tool for sustainable agriculture. After reviewing various aspects of crop residue as feedstock, we recommend its use as a blend, rather than sole use, along with several other lignocellulosic materials under pyrolysis process as well as ameliorating agent.
Biosensors and Bioelectronics, 2015
Talanta, 2010
Iminoazophenol appended calix[4]arene/thiacalix[4]arene derivatives 1 and 2 of cone and 3 of 1,3-... more Iminoazophenol appended calix[4]arene/thiacalix[4]arene derivatives 1 and 2 of cone and 3 of 1,3-alternate conformation have been synthesized and examined for their chromogenic anion recognition abilities towards different anions like fluoride, chloride, bromide, iodide, acetate, dihydrogenphosphate, nitrate and hydrogensulphate by UV-vis spectroscopy. Receptors 1-3 show an unusual red shift in UV-vis spectra upon binding with these anions, with a colour change visible to naked eye in case of fluoride, acetate and dihydrogenphosphate ions at lower concentration of anions. This red shift in the absorption spectra is accounted by anion complexation induced sigma-extended conjugation.
Sensors and Actuators B: Chemical, 2010
New fluorescent sensors 6, 7 and 9 based on calix[4]arenes have been synthesized and examined for... more New fluorescent sensors 6, 7 and 9 based on calix[4]arenes have been synthesized and examined for their binding abilities towards different metal ions (Li + , Na + , K + , Pb 2+ , Zn 2+ , Hg 2+ and Ag + ) by UV and fluorescence spectroscopy. Two of these receptors (6 and 7) show ratiometric sensing while the third receptor (9) shows 'On-Off' signaling of Pb 2+ ion among the various metal ions tested. The stoichiometry of the complexation was found to be 1:1 as established by Job's plot.
Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2010
Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformatio... more Abstract Calix[4]arene based podands 1a of cone con-formation and 1b of 1,3-alternate conformation possessing imine units and bearing anthracene moieties have been synthesized by a 1 ? 2 Schiff base condensation in good yields and examined for their cation recognition abilities ...
Dalton Transactions, 2010
Synthetic strategies are described to synthesize the calix[4]arene diamine 4 of partial cone (pac... more Synthetic strategies are described to synthesize the calix[4]arene diamine 4 of partial cone (paco) conformation, which on condensation with 9-anthracene carbaldehyde forms the chemosensor 5 in paco conformation. The chemosensor 5 undergoes fluorescence enhancement in the presence of Ni(2+) ions.
Journal of Inclusion Phenomena and …, 2002
... Printed in the Netherlands. 247 Synthesis of New Cryptands Containing 3,5-Disubstituted-1-Met... more ... Printed in the Netherlands. 247 Synthesis of New Cryptands Containing 3,5-Disubstituted-1-Methyl or 1-Hexadecyl-Pyrazole by [3+2] Condensation and Reduction MANOJ KUMAR1,VANDANA SHARMA (NEE Bhalla)2,∗ and J. NAGENDRA BABU1 ...
Applied Surface Science, 2014
Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted ... more Lignocellulosic crop residue biomass, in surplus, is of vital importance due to its multifaceted utilization potential on- and off-site to agricultural systems; therefore, its management is essential for sustainable agriculture. The malpractice of open crop residue burning leading to the brown cloud phenomenon and contributing significantly to atmospheric heterogeneity through enhanced gaseous and particulate emissions is of greater off-late concern. Available traditional crop residue management (CRM) technologies have not achieved wider adaptation; therefore, recently thermochemical conversion has been foreseen as an interesting tool for potential CRM under changing climate scenario. Biochar, a by- product of thermochemical processes, has been evaluated as a potential soil ameliorant and C sequestration agent. As soil ameliorant, it improves soil basic properties directly along with subdued release of greenhouse gases from agroecosystems, provides adsorption surface to agrochemical...
Supramolecular Chemistry, Jan 1, 2007
A new chromogenic receptor based on 1, 2-phenylene derivative containing thiourea moieties is syn... more A new chromogenic receptor based on 1, 2-phenylene derivative containing thiourea moieties is synthesized and examined for its anion binding ability by UVVis and 1H NMR studies. The results show that the receptor has selective colorimetric sensing of fluoride ...
Cheminform, Jan 1, 2004
A facile synthesis of symmetrical and unsymmetrical ethers is achieved by reductive coupling of c... more A facile synthesis of symmetrical and unsymmetrical ethers is achieved by reductive coupling of carbonyl compounds with alkoxysilanes. This reaction is performed using inert polymethylhydrosiloxane as the hydride source and B(C 6 F 5 ) 3 as the catalytic activator of the PMHS.