Susmita Roy - Academia.edu (original) (raw)

Papers by Susmita Roy

Research paper thumbnail of CO2 fixation at atmospheric pressure: porous ZnSnO3 nanocrystals as a highly efficient catalyst for the synthesis of cyclic carbonates

RSC Advances, 2016

Self-assembled, ultra small, porous zinc stannate nanocrystals have been synthesized, which catal... more Self-assembled, ultra small, porous zinc stannate nanocrystals have been synthesized, which catalyzes the formation of cyclic carbonates from various epoxide and CO2 under very mild reaction conditions.

Research paper thumbnail of Mesoporous polyacrylic acid supported silver nanoparticles as an efficient catalyst for reductive coupling of nitrobenzenes and alcohols using glycerol as hydrogen source

Journal of colloid and interface science, Jan 15, 2016

Silver nanoparticle immobilized mesoporous cross-linked polyacrylic acid (Ag-MCP-1) has been synt... more Silver nanoparticle immobilized mesoporous cross-linked polyacrylic acid (Ag-MCP-1) has been synthesized via aqueous-phase polymerization of acrylic acid followed by the surface immobilization with silver nanoparticles. The nanocomposite material has been characterized by different spectroscopic techniques. Powder X-ray diffraction patterns revealed the formation of silver nanoparticles, while transmission electron microscope image showed that Ag nanoparticles are formed and uniformly dispersed in the mesoporous polyacrylic acid. The Ag-MCP-1 nanocomposite can be used as an efficient heterogeneous catalyst in the reductive coupling of nitrobenzenes and alcohols using glycerol as hydrogen source. This nanocomposite can be reused more than five times without any significant decrease in its catalytic activity.

Research paper thumbnail of A new chiral Fe(iii)–salen grafted mesoporous catalyst for enantioselective asymmetric ring opening of racemic epoxides at room temperature under solvent-free conditions

Chemical Communications, 2016

A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the... more A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the enantioselective (ee > 99%) ARO reaction of racemic epoxides with aromatic amine under solvent-free conditions.

Research paper thumbnail of Mesoporous Titania-Iron(III) Oxide with Nanoscale Porosity and High Catalytic Activity for the Synthesis of β-Amino Alcohols and Benzimidazole Derivatives

ChemCatChem, 2015

for funding. We acknowledge DST for providing supportt ot he University of Kalyani under Purse an... more for funding. We acknowledge DST for providing supportt ot he University of Kalyani under Purse and FIST programme. B.B. acknowledges the Council of Scientific and Industrial Research (CSIR) for aS PM research fellowship.N .S. acknowledges UGC, New Delhi for providing his senior research fellowship. A.B. wishes to thank DST-SERB, New Delhi for ae xtramural project grant and DST Unit on Nanoscience for providing instrumentalf acilities at IACS.

Research paper thumbnail of Silver nanoparticles embedded over mesoporous organic polymer as highly efficient and reusable nanocatalyst for the reduction of nitroarenes and aerobic oxidative esterification of alcohols

Silver nanoparticles (Ag-NPs) have been finely dispersed at the mesoporous organic polymer via po... more Silver nanoparticles (Ag-NPs) have been finely dispersed at the mesoporous organic polymer via postsynthetic chemical grafting over mesoporous poly-triallylamine (MPTA-1). The resulting Ag-MPTA-1 nanomaterial has been characterized by elemental analysis, powder x-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS), thermogravimetric analysis (TGA), EPR spectroscopy and AAS elemental analysis. The Ag-MPTA-1 acts as an efficient heterogeneous nanocatalyst in the reduction of substituted nitrobenzenes via transfer hydrogenation. The material also showed excellent catalytic activity in one-step catalytic oxidative esterification of primary alcohols using molecular oxygen as a green oxidant. The catalyst is air-stable, inexpensive, easy to prepare and reused several times without significant decrease in activity and selectivity.

Research paper thumbnail of Cu-grafted mesoporous organic polymer: a new recyclable nanocatalyst for multi-component, N-arylation and S-arylation reactions

Catalysis Science & Technology, 2013

Figure S1. HR TEM image of Cu-MPTA-1 catalyst after the catalytic reaction.

Research paper thumbnail of Solvent selective phenyl selenylation and phenyl tellurylation of aryl boronic acids catalyzed by Cu(II) grafted functionalized polystyrene

Tetrahedron Letters, 2015

A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boro... more A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boronic acids has been developed for the first time using a polymer supported Cu(II) catalyst. The catalyst was synthesized by anchoring Cu(OAc) 2 onto a functionalized polystyrene with pyridine thiosemicarbazone ligand. It was then characterized properly by SEM, EDAX, FT-IR, TGA, and EPR experiments. The catalyst smoothly catalyzes phenyl selenylation of aryl boronic acids in water and phenyl tellurylation of aryl boronic acids in PEG-600, selectively. Thus a wide variety of unsymmetrical organodiaryl or aryl-heteroaryl selenides and tellurides has been synthesized by this protocol. The catalyst was recycled upto six runs without any appreciable loss of catalytic activity.

Research paper thumbnail of Cu(II)-anchored functionalized mesoporous SBA-15: An efficient and recyclable catalyst for the one-pot Click reaction in water

Journal of Molecular Catalysis A: Chemical, 2014

A new pyridine-imine functionalized mesoporus silica (SBA-15) has been synthesized through the Sc... more A new pyridine-imine functionalized mesoporus silica (SBA-15) has been synthesized through the Schiff-base condensation of 3-aminopropyl functionalized SBA-15 with 2-pyridinecarboxaldehyde followed by the grafting of Cu(II) onto it resulting a new Cu@PyIm-SBA-15 material. 2D-hexagonally ordered mesophases of the material are analyzed by small-angle powder X-ray diffractions (PXRD) and transmission electron microscopic (TEM) image analyses. The Cu(II)-anchored mesoporous material, Cu@PyIm-SBA-15 showed excellent catalytic activity towards the one pot click reaction between azides formed in situ from the corresponding amines and acetylenes in water at 0 • C to room temperature resulting a wide variety of 1,4-disubstituted 1,2,3-triazoles. The catalyst has been recycled for five cycles without any appreciable loss of catalytic activity and also without any appreciable Cu-leaching, suggesting a future potential of this novel mesoporous catalyst for the synthesis of 1,4-disubstituted 1,2,3-triazoles.

Research paper thumbnail of Miltefosine Effectively Modulates the Cytokine Milieu in Indian Post Kala-Azar Dermal Leishmaniasis

The Journal of Infectious Diseases, 2011

Research paper thumbnail of Polymer anchored Cu(ii) complex: an efficient and recyclable catalytic system for the one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles starting from anilines in water

Green Chemistry, 2013

Table of content Pages Copies of 1 H and 13 C NMR of all the products listed in Table 2 2-8 Copie... more Table of content Pages Copies of 1 H and 13 C NMR of all the products listed in Table 2 2-8 Copies of 1 H and 13 C NMR of all the products listed in Table 3 9-14

Research paper thumbnail of Cu(ii) anchored nitrogen-rich covalent imine network (CuII-CIN-1): an efficient and recyclable heterogeneous catalyst for the synthesis of organoselenides from aryl boronic acids in a green solvent

RSC Adv., 2014

A Cu(ii)-grafted covalent imine framework material has been designed, which catalyzes the C–Se cr... more A Cu(ii)-grafted covalent imine framework material has been designed, which catalyzes the C–Se cross-coupling reactions to obtain a library of organoselenides.

Research paper thumbnail of CO2 fixation at atmospheric pressure: porous ZnSnO3 nanocrystals as a highly efficient catalyst for the synthesis of cyclic carbonates

RSC Advances, 2016

Self-assembled, ultra small, porous zinc stannate nanocrystals have been synthesized, which catal... more Self-assembled, ultra small, porous zinc stannate nanocrystals have been synthesized, which catalyzes the formation of cyclic carbonates from various epoxide and CO2 under very mild reaction conditions.

Research paper thumbnail of Mesoporous polyacrylic acid supported silver nanoparticles as an efficient catalyst for reductive coupling of nitrobenzenes and alcohols using glycerol as hydrogen source

Journal of colloid and interface science, Jan 15, 2016

Silver nanoparticle immobilized mesoporous cross-linked polyacrylic acid (Ag-MCP-1) has been synt... more Silver nanoparticle immobilized mesoporous cross-linked polyacrylic acid (Ag-MCP-1) has been synthesized via aqueous-phase polymerization of acrylic acid followed by the surface immobilization with silver nanoparticles. The nanocomposite material has been characterized by different spectroscopic techniques. Powder X-ray diffraction patterns revealed the formation of silver nanoparticles, while transmission electron microscope image showed that Ag nanoparticles are formed and uniformly dispersed in the mesoporous polyacrylic acid. The Ag-MCP-1 nanocomposite can be used as an efficient heterogeneous catalyst in the reductive coupling of nitrobenzenes and alcohols using glycerol as hydrogen source. This nanocomposite can be reused more than five times without any significant decrease in its catalytic activity.

Research paper thumbnail of A new chiral Fe(iii)–salen grafted mesoporous catalyst for enantioselective asymmetric ring opening of racemic epoxides at room temperature under solvent-free conditions

Chemical Communications, 2016

A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the... more A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the enantioselective (ee > 99%) ARO reaction of racemic epoxides with aromatic amine under solvent-free conditions.

Research paper thumbnail of Mesoporous Titania-Iron(III) Oxide with Nanoscale Porosity and High Catalytic Activity for the Synthesis of β-Amino Alcohols and Benzimidazole Derivatives

ChemCatChem, 2015

for funding. We acknowledge DST for providing supportt ot he University of Kalyani under Purse an... more for funding. We acknowledge DST for providing supportt ot he University of Kalyani under Purse and FIST programme. B.B. acknowledges the Council of Scientific and Industrial Research (CSIR) for aS PM research fellowship.N .S. acknowledges UGC, New Delhi for providing his senior research fellowship. A.B. wishes to thank DST-SERB, New Delhi for ae xtramural project grant and DST Unit on Nanoscience for providing instrumentalf acilities at IACS.

Research paper thumbnail of Silver nanoparticles embedded over mesoporous organic polymer as highly efficient and reusable nanocatalyst for the reduction of nitroarenes and aerobic oxidative esterification of alcohols

Silver nanoparticles (Ag-NPs) have been finely dispersed at the mesoporous organic polymer via po... more Silver nanoparticles (Ag-NPs) have been finely dispersed at the mesoporous organic polymer via postsynthetic chemical grafting over mesoporous poly-triallylamine (MPTA-1). The resulting Ag-MPTA-1 nanomaterial has been characterized by elemental analysis, powder x-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS), thermogravimetric analysis (TGA), EPR spectroscopy and AAS elemental analysis. The Ag-MPTA-1 acts as an efficient heterogeneous nanocatalyst in the reduction of substituted nitrobenzenes via transfer hydrogenation. The material also showed excellent catalytic activity in one-step catalytic oxidative esterification of primary alcohols using molecular oxygen as a green oxidant. The catalyst is air-stable, inexpensive, easy to prepare and reused several times without significant decrease in activity and selectivity.

Research paper thumbnail of Cu-grafted mesoporous organic polymer: a new recyclable nanocatalyst for multi-component, N-arylation and S-arylation reactions

Catalysis Science & Technology, 2013

Figure S1. HR TEM image of Cu-MPTA-1 catalyst after the catalytic reaction.

Research paper thumbnail of Solvent selective phenyl selenylation and phenyl tellurylation of aryl boronic acids catalyzed by Cu(II) grafted functionalized polystyrene

Tetrahedron Letters, 2015

A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boro... more A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boronic acids has been developed for the first time using a polymer supported Cu(II) catalyst. The catalyst was synthesized by anchoring Cu(OAc) 2 onto a functionalized polystyrene with pyridine thiosemicarbazone ligand. It was then characterized properly by SEM, EDAX, FT-IR, TGA, and EPR experiments. The catalyst smoothly catalyzes phenyl selenylation of aryl boronic acids in water and phenyl tellurylation of aryl boronic acids in PEG-600, selectively. Thus a wide variety of unsymmetrical organodiaryl or aryl-heteroaryl selenides and tellurides has been synthesized by this protocol. The catalyst was recycled upto six runs without any appreciable loss of catalytic activity.

Research paper thumbnail of Cu(II)-anchored functionalized mesoporous SBA-15: An efficient and recyclable catalyst for the one-pot Click reaction in water

Journal of Molecular Catalysis A: Chemical, 2014

A new pyridine-imine functionalized mesoporus silica (SBA-15) has been synthesized through the Sc... more A new pyridine-imine functionalized mesoporus silica (SBA-15) has been synthesized through the Schiff-base condensation of 3-aminopropyl functionalized SBA-15 with 2-pyridinecarboxaldehyde followed by the grafting of Cu(II) onto it resulting a new Cu@PyIm-SBA-15 material. 2D-hexagonally ordered mesophases of the material are analyzed by small-angle powder X-ray diffractions (PXRD) and transmission electron microscopic (TEM) image analyses. The Cu(II)-anchored mesoporous material, Cu@PyIm-SBA-15 showed excellent catalytic activity towards the one pot click reaction between azides formed in situ from the corresponding amines and acetylenes in water at 0 • C to room temperature resulting a wide variety of 1,4-disubstituted 1,2,3-triazoles. The catalyst has been recycled for five cycles without any appreciable loss of catalytic activity and also without any appreciable Cu-leaching, suggesting a future potential of this novel mesoporous catalyst for the synthesis of 1,4-disubstituted 1,2,3-triazoles.

Research paper thumbnail of Miltefosine Effectively Modulates the Cytokine Milieu in Indian Post Kala-Azar Dermal Leishmaniasis

The Journal of Infectious Diseases, 2011

Research paper thumbnail of Polymer anchored Cu(ii) complex: an efficient and recyclable catalytic system for the one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles starting from anilines in water

Green Chemistry, 2013

Table of content Pages Copies of 1 H and 13 C NMR of all the products listed in Table 2 2-8 Copie... more Table of content Pages Copies of 1 H and 13 C NMR of all the products listed in Table 2 2-8 Copies of 1 H and 13 C NMR of all the products listed in Table 3 9-14

Research paper thumbnail of Cu(ii) anchored nitrogen-rich covalent imine network (CuII-CIN-1): an efficient and recyclable heterogeneous catalyst for the synthesis of organoselenides from aryl boronic acids in a green solvent

RSC Adv., 2014

A Cu(ii)-grafted covalent imine framework material has been designed, which catalyzes the C–Se cr... more A Cu(ii)-grafted covalent imine framework material has been designed, which catalyzes the C–Se cross-coupling reactions to obtain a library of organoselenides.