Biraj Kumar barman - Academia.edu (original) (raw)
Uploads
Papers by Biraj Kumar barman
Synthesis and characterization of an industrially significant ionic liquid and its inclusion complex with β-cyclodextrin and its soluble derivative for their advanced applications
Chemical Physics Letters, 2021
Abstract Thermochromic also solvatochromic ionic liquid surfactant was synthesized and characteri... more Abstract Thermochromic also solvatochromic ionic liquid surfactant was synthesized and characterised. The surface activity, size and stability were estimated by surface tension, SEM and DLS techniques. Inclusion complexes construction of the synthesized compound with the β-cyclodextrin and derivative was explored by various techniques. Conductance, surface tension trial & Jobs obtained from the UV-vis spectra proved the formation of 1:1 inclusion complexes between the surfactant and cyclodextrins. Binding constants and thermodynamic parameters of the inclusion of the guest DMPI with both hosts were determined with UV-vis and sophisticated fluorimetric analysis. Anti bacterial properties of DMPI and its both inclusion complexes were analyzed.
Electrolytic conductivities, densities, viscosities, and Fourier transform infrared (FTIR) studie... more Electrolytic conductivities, densities, viscosities, and Fourier transform infrared (FTIR) studies of 1-buty-1-methyl pyrrolidiniumbromide ([BMPyrr][Br]) and 1-butyl-1-methylpyrrolidiniumchloride ([BMPyrr][Cl]) have been studied in methanol at different temperatures. The limiting molar conductivities, association constants, and the distance of closest approach of the ions have been analyzed using the Fuoss conductance equation (1978) for ionpair formation. Ion-solvent interactions have been interpreted in terms of apparent molar volumes and viscosity B-coefficients which are obtained from the results of density and viscosity measurements. The limiting apparent molar volumes, experimental slopes derived from the Masson equation and viscosity A and B coefficients using the Jones–Dole equation have been interpreted in terms of ion-ion and ion-solvent interactions respectively. The FTIR spectra for the methanol, as well as the ionic liquids in methanol have also been recorded. The exper...
Journal of Molecular Structure, 2018
The formation of the host-guest inclusion complexes of ionic liquids namely [BMIm]Cl and [HMIm]Cl... more The formation of the host-guest inclusion complexes of ionic liquids namely [BMIm]Cl and [HMIm]Cl with a-CD and b-CD were studied by means of physicochemical and spectroscopic methods. Conductivity and surface tension study were in good agreement with the 1H NMR and FT-IR studies which confirm the formation of the inclusion complexes. The Density and viscosity study also supported the formation of the ICs. Further the stoichiometry was determined 1:1 for each case and the association constants and thermodynamic parameters derived supported the most feasible formation of the [BMIm]Cl-b-CD inclusion complex.
Chemical Physics Letters, 2018
Inclusion complex formation of 3-octyl-1-methylimidazolium bromide (OMImBr) into αand βcyclodextr... more Inclusion complex formation of 3-octyl-1-methylimidazolium bromide (OMImBr) into αand βcyclodextrins has been investigated with physicochemical methods and spectroscopic techniques. Spectroscopic studies like FT-IR, UV and Visible and 1 H NMR, 2D ROESY NMR were carried out to confirm the formation of inclusion complexes. The surface tension and conductivity measurements reveal the 1:1 stoichiometry of the inclusion complex. The well-known Job's method and Benesi-Hildebrand method from UV study was also applied for confirmation the host-guest stoichiometry.
ChemistrySelect, 2018
The water soluble inclusion complexes of pyridinium based hydrophobic ionic liquid (IL) were prep... more The water soluble inclusion complexes of pyridinium based hydrophobic ionic liquid (IL) were prepared and characterised successfully. The inclusion complexes of sparingly soluble IL prepared with aand b-cyclodextrin in the mixed solvent medium and in solid state were studied by different physicochemical methodologies. Comparison of the chemical shift of the pure CDs, guest and complexes formed in 1-H NMR spectra, appearance of the cross peaks in 2D-ROESY spectra and shift in the band positions in FT-IR spectra confirmed the formation of inclusion complexes. Surface tension and con-ductance studies in the mixed solvent system indicated the 1:1 stoichiometric ratio of inclusion complex. Job's plot obtained from UV-Vis study and the spectra obtained from mass spectrometric study supported the formation as well as the stoichiometry of inclusion complexes. The high binding constant values and calculated values of thermodynamic parameters such as Gibb's free energy, enthalpy and entropy supported the high stability and feasibility of formation of the inclusion complex.
Journal of Molecular Liquids, 2018
Inclusion complexation between tetrabutylphosphonium methanesulfonate as guest and αand β-cyclode... more Inclusion complexation between tetrabutylphosphonium methanesulfonate as guest and αand β-cyclodextrin as hosts investigated by physicochemical methodology. The address for the corresponding author was captured as affiliation for all authors. Please check if appropriate. Molliq(2017),
Journal of Molecular Structure, 2018
The supramolecular interaction of metoclopramide hydrochloride (MP) with α-cyclodextrin (α-CD) an... more The supramolecular interaction of metoclopramide hydrochloride (MP) with α-cyclodextrin (α-CD) and β-cyclodextrin (β-CD) has been inspected by ultravioletvisible (UV-vis) light, infra-red (IR) light, fluorescence and 1 H NMR spectroscopy. The formation of an inclusion complex greatly affects the physical-chemical properties of the guest molecules, such as solubility, chemical reactivity and the spectroscopic and electrochemical properties. Thus the changes in the spectral properties and physicochemical properties confirm the inclusion complex formation. Surface tension, conductivity studies and Job's plot indicate a 1 : 1 stoichiometry of the MP:CD hostguest inclusion complexes. The binding/association constants have been evaluated by both UV-Vis and fluorescence spectroscopic study indicating a higher degree of encapsulation for β-cyclodextrin (β-CD). Furthermore, the negative value of thermodynamic parameter (ΔG°) of the host-guest system suggests that the inclusion process proceeded spontaneously at 298.15 K. Based on the NMR data, the plausible mode of interaction of MP:α-CD and MP:β-CD complexes were proposed, which suggested that lipophilic aromatic ring of the MP entered into the cavity of CDs from the wider side, with the amide (-CONH) and methoxy (-OMe) residues inside the CD cavity.
Zeitschrift für Physikalische Chemie, 2018
Structurally different Molecules namely Pentoxifylline and Pralidoxim were chosen along with α-cy... more Structurally different Molecules namely Pentoxifylline and Pralidoxim were chosen along with α-cyclodextrin and β-cyclodextrin to study host-guest inclusion phenomena. The formations of host guest inclusion complexes were confirmed by studying 1H-NMR spectra, FT-IR spectra, apparent molar volume and viscosity co-efficient. The stabilities of inclusion complexes were compared calculating the binding constant from UV-VIS spectroscopic study. The 1:1 stoichiometry of the inclusion complexes were also determined by analysing the Jobs plot and surface tension data. The values for Gibbs’ free energy were found negative for both the processes. Based on all the above experiments the inclusion processes were found feasible for both the compounds. These types of inclusion complexes are of high interest in the field of research and industry as these are used as drug delivery systems.
Journal of Molecular Liquids, 2018
Investigation of diverse interactions of amino acids (Asp and Glu) in aqueous Dopamine Hydrochlor... more Investigation of diverse interactions of amino acids (Asp and Glu) in aqueous Dopamine Hydrochloride with the manifestation of the catecholamine molecule recognition tool in solution phase. Molliq (2018),
Scientific reports, Jan 29, 2018
Host-guest interaction of two significant drugs, phenylephrine hydrochloride and synephrine with ... more Host-guest interaction of two significant drugs, phenylephrine hydrochloride and synephrine with α and β-cyclodextrins were studied systematically. Initially two simple but reliable physicochemical techniques namely conductance and surface tension were employed to find out saturation concentration for the inclusion and its stoichiometry. The obtained 1:1 stoichiometry was further confirmed by two spectrometric methods, UV-Vis study and spectrofluorimetry. Significant shifts in IR stretching frequency also support the inclusion process. Relative stabilities of the inclusion complexes were established by the association constants obtained from UV-Vis spectroscopic measurements, program based mathematical calculation of conductivity data. Calculations of the thermodynamic parameters dictates thermodynamic feasibility of the inclusion process. Spectrofluorometric measurement scaffolds the UV-Vis spectroscopic measurement validating stability of the ICs once again. Mass spectroscopic mea...
Journal of Molecular Liquids, 2016
This work has been focused on the characteristics of green solvent i.e. 1-butyl-4-methylpyridiniu... more This work has been focused on the characteristics of green solvent i.e. 1-butyl-4-methylpyridinium iodide and some organic oligosaccharides, αand β-cyclodextrins in aqueous media. In aqueous solution, hydrophobic butyl side chain of the ionic liquid has been inserted into the hollow space of cyclodextrin. The selective formation of 1:1 inclusion complexes has been established here. Surface tension values, conductivity trends, and thermodynamic and spectroscopic study reveal that formations of inclusion complexes are more favorable and efficient for β-CD than α-CD.
Study on Solvation Consequences of 1-Butyl-1-Methylpyrrolidium Bromide and Chloride Prevailing in Protic Solvent System
Synthesis and characterization of an industrially significant ionic liquid and its inclusion complex with β-cyclodextrin and its soluble derivative for their advanced applications
Chemical Physics Letters, 2021
Abstract Thermochromic also solvatochromic ionic liquid surfactant was synthesized and characteri... more Abstract Thermochromic also solvatochromic ionic liquid surfactant was synthesized and characterised. The surface activity, size and stability were estimated by surface tension, SEM and DLS techniques. Inclusion complexes construction of the synthesized compound with the β-cyclodextrin and derivative was explored by various techniques. Conductance, surface tension trial & Jobs obtained from the UV-vis spectra proved the formation of 1:1 inclusion complexes between the surfactant and cyclodextrins. Binding constants and thermodynamic parameters of the inclusion of the guest DMPI with both hosts were determined with UV-vis and sophisticated fluorimetric analysis. Anti bacterial properties of DMPI and its both inclusion complexes were analyzed.
Electrolytic conductivities, densities, viscosities, and Fourier transform infrared (FTIR) studie... more Electrolytic conductivities, densities, viscosities, and Fourier transform infrared (FTIR) studies of 1-buty-1-methyl pyrrolidiniumbromide ([BMPyrr][Br]) and 1-butyl-1-methylpyrrolidiniumchloride ([BMPyrr][Cl]) have been studied in methanol at different temperatures. The limiting molar conductivities, association constants, and the distance of closest approach of the ions have been analyzed using the Fuoss conductance equation (1978) for ionpair formation. Ion-solvent interactions have been interpreted in terms of apparent molar volumes and viscosity B-coefficients which are obtained from the results of density and viscosity measurements. The limiting apparent molar volumes, experimental slopes derived from the Masson equation and viscosity A and B coefficients using the Jones–Dole equation have been interpreted in terms of ion-ion and ion-solvent interactions respectively. The FTIR spectra for the methanol, as well as the ionic liquids in methanol have also been recorded. The exper...
Journal of Molecular Structure, 2018
The formation of the host-guest inclusion complexes of ionic liquids namely [BMIm]Cl and [HMIm]Cl... more The formation of the host-guest inclusion complexes of ionic liquids namely [BMIm]Cl and [HMIm]Cl with a-CD and b-CD were studied by means of physicochemical and spectroscopic methods. Conductivity and surface tension study were in good agreement with the 1H NMR and FT-IR studies which confirm the formation of the inclusion complexes. The Density and viscosity study also supported the formation of the ICs. Further the stoichiometry was determined 1:1 for each case and the association constants and thermodynamic parameters derived supported the most feasible formation of the [BMIm]Cl-b-CD inclusion complex.
Chemical Physics Letters, 2018
Inclusion complex formation of 3-octyl-1-methylimidazolium bromide (OMImBr) into αand βcyclodextr... more Inclusion complex formation of 3-octyl-1-methylimidazolium bromide (OMImBr) into αand βcyclodextrins has been investigated with physicochemical methods and spectroscopic techniques. Spectroscopic studies like FT-IR, UV and Visible and 1 H NMR, 2D ROESY NMR were carried out to confirm the formation of inclusion complexes. The surface tension and conductivity measurements reveal the 1:1 stoichiometry of the inclusion complex. The well-known Job's method and Benesi-Hildebrand method from UV study was also applied for confirmation the host-guest stoichiometry.
ChemistrySelect, 2018
The water soluble inclusion complexes of pyridinium based hydrophobic ionic liquid (IL) were prep... more The water soluble inclusion complexes of pyridinium based hydrophobic ionic liquid (IL) were prepared and characterised successfully. The inclusion complexes of sparingly soluble IL prepared with aand b-cyclodextrin in the mixed solvent medium and in solid state were studied by different physicochemical methodologies. Comparison of the chemical shift of the pure CDs, guest and complexes formed in 1-H NMR spectra, appearance of the cross peaks in 2D-ROESY spectra and shift in the band positions in FT-IR spectra confirmed the formation of inclusion complexes. Surface tension and con-ductance studies in the mixed solvent system indicated the 1:1 stoichiometric ratio of inclusion complex. Job's plot obtained from UV-Vis study and the spectra obtained from mass spectrometric study supported the formation as well as the stoichiometry of inclusion complexes. The high binding constant values and calculated values of thermodynamic parameters such as Gibb's free energy, enthalpy and entropy supported the high stability and feasibility of formation of the inclusion complex.
Journal of Molecular Liquids, 2018
Inclusion complexation between tetrabutylphosphonium methanesulfonate as guest and αand β-cyclode... more Inclusion complexation between tetrabutylphosphonium methanesulfonate as guest and αand β-cyclodextrin as hosts investigated by physicochemical methodology. The address for the corresponding author was captured as affiliation for all authors. Please check if appropriate. Molliq(2017),
Journal of Molecular Structure, 2018
The supramolecular interaction of metoclopramide hydrochloride (MP) with α-cyclodextrin (α-CD) an... more The supramolecular interaction of metoclopramide hydrochloride (MP) with α-cyclodextrin (α-CD) and β-cyclodextrin (β-CD) has been inspected by ultravioletvisible (UV-vis) light, infra-red (IR) light, fluorescence and 1 H NMR spectroscopy. The formation of an inclusion complex greatly affects the physical-chemical properties of the guest molecules, such as solubility, chemical reactivity and the spectroscopic and electrochemical properties. Thus the changes in the spectral properties and physicochemical properties confirm the inclusion complex formation. Surface tension, conductivity studies and Job's plot indicate a 1 : 1 stoichiometry of the MP:CD hostguest inclusion complexes. The binding/association constants have been evaluated by both UV-Vis and fluorescence spectroscopic study indicating a higher degree of encapsulation for β-cyclodextrin (β-CD). Furthermore, the negative value of thermodynamic parameter (ΔG°) of the host-guest system suggests that the inclusion process proceeded spontaneously at 298.15 K. Based on the NMR data, the plausible mode of interaction of MP:α-CD and MP:β-CD complexes were proposed, which suggested that lipophilic aromatic ring of the MP entered into the cavity of CDs from the wider side, with the amide (-CONH) and methoxy (-OMe) residues inside the CD cavity.
Zeitschrift für Physikalische Chemie, 2018
Structurally different Molecules namely Pentoxifylline and Pralidoxim were chosen along with α-cy... more Structurally different Molecules namely Pentoxifylline and Pralidoxim were chosen along with α-cyclodextrin and β-cyclodextrin to study host-guest inclusion phenomena. The formations of host guest inclusion complexes were confirmed by studying 1H-NMR spectra, FT-IR spectra, apparent molar volume and viscosity co-efficient. The stabilities of inclusion complexes were compared calculating the binding constant from UV-VIS spectroscopic study. The 1:1 stoichiometry of the inclusion complexes were also determined by analysing the Jobs plot and surface tension data. The values for Gibbs’ free energy were found negative for both the processes. Based on all the above experiments the inclusion processes were found feasible for both the compounds. These types of inclusion complexes are of high interest in the field of research and industry as these are used as drug delivery systems.
Journal of Molecular Liquids, 2018
Investigation of diverse interactions of amino acids (Asp and Glu) in aqueous Dopamine Hydrochlor... more Investigation of diverse interactions of amino acids (Asp and Glu) in aqueous Dopamine Hydrochloride with the manifestation of the catecholamine molecule recognition tool in solution phase. Molliq (2018),
Scientific reports, Jan 29, 2018
Host-guest interaction of two significant drugs, phenylephrine hydrochloride and synephrine with ... more Host-guest interaction of two significant drugs, phenylephrine hydrochloride and synephrine with α and β-cyclodextrins were studied systematically. Initially two simple but reliable physicochemical techniques namely conductance and surface tension were employed to find out saturation concentration for the inclusion and its stoichiometry. The obtained 1:1 stoichiometry was further confirmed by two spectrometric methods, UV-Vis study and spectrofluorimetry. Significant shifts in IR stretching frequency also support the inclusion process. Relative stabilities of the inclusion complexes were established by the association constants obtained from UV-Vis spectroscopic measurements, program based mathematical calculation of conductivity data. Calculations of the thermodynamic parameters dictates thermodynamic feasibility of the inclusion process. Spectrofluorometric measurement scaffolds the UV-Vis spectroscopic measurement validating stability of the ICs once again. Mass spectroscopic mea...
Journal of Molecular Liquids, 2016
This work has been focused on the characteristics of green solvent i.e. 1-butyl-4-methylpyridiniu... more This work has been focused on the characteristics of green solvent i.e. 1-butyl-4-methylpyridinium iodide and some organic oligosaccharides, αand β-cyclodextrins in aqueous media. In aqueous solution, hydrophobic butyl side chain of the ionic liquid has been inserted into the hollow space of cyclodextrin. The selective formation of 1:1 inclusion complexes has been established here. Surface tension values, conductivity trends, and thermodynamic and spectroscopic study reveal that formations of inclusion complexes are more favorable and efficient for β-CD than α-CD.
Study on Solvation Consequences of 1-Butyl-1-Methylpyrrolidium Bromide and Chloride Prevailing in Protic Solvent System