aswini kalita | Indian Institute of Technology Guwahati (original) (raw)
Papers by aswini kalita
Inorganica Chimica Acta, Jun 1, 2011
Polyoxometallate (POM) clusters represent an interesting choice of building blocks for the constr... more Polyoxometallate (POM) clusters represent an interesting choice of building blocks for the construction of inorganicorganic hybrid materials. The supramolecular aggregation of several iso-and heteropolymetallate anions in presence of various organoamino ...
Department of Chemistry, Sipajhar College, Darrang-784 145, Assam, India <em>E-mail</em&... more Department of Chemistry, Sipajhar College, Darrang-784 145, Assam, India <em>E-mail</em>: aswinikalita2012@gmail.com <em>Manuscript received online 30 December 2019, revised 01 February 2020, accepted 29 April 2020</em> A copper(II) complex with bidentate ligand L [L, N-4-(phenylimino)pent-2-en-2-yl)benzenamine] was synthesized as its perchlorate salt. The single crystal structure for ligand L was determined as its chloride salt. The nitric oxide reactivity of the complex was studied in acetonitrile solvent. The formation of thermally unstable [Cu(II)-NO] intermediate on reaction of the complex with nitric oxide in acetonitrile solution was observed prior to the reduction of copper(II) centres to copper(I). The reduction was found to result with a mono nitrosation at the secondary amine site as well as C=C bond breaking of the ligand leads to the formation of an amide product. All the products were isolated and characterized spectroscopically. The X-ray singl...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DESCRIPTION Two iron(III) complexes, 1 and 2 with L1 and L2 [ L1 = N,N'-bis(2-hydroxybenzyl)-... more DESCRIPTION Two iron(III) complexes, 1 and 2 with L1 and L2 [ L1 = N,N'-bis(2-hydroxybenzyl)-1,2-diaminobenzene; L2 = N,N'-bis(2-hydroxybenzyl)ethylenediamine], respectively, were synthesized and characterized. In methanol solution of the complexes, the Fe(III) centre was found to reduce in presence of NO gas. The formation of [FeIII-NO] intermediate prior to the reduction of Fe(III) center was evidenced by UV-visible, solution FT-IR, X-band EPR studies. The presence of excess NO gas leads to the reductive nitrosylation of the complexes leading to the formation of corresponding Fe(II)-nitrosyl complexes, 3 and 4, respectively. The Fe(II)-nitrosyls were isolated as solid and characterized spectroscopically. DFT calculations were performed to optimize the structures of all the complexes.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Inorganica Chimica Acta, 2015
Manganese(II) complexes, [Mn(L)(Cl) 2 ], 1 and [Mn(L)(H 2 O) 2 ](ClO 4) 2 , 2 {L = N 1 ,N 2-bis((... more Manganese(II) complexes, [Mn(L)(Cl) 2 ], 1 and [Mn(L)(H 2 O) 2 ](ClO 4) 2 , 2 {L = N 1 ,N 2-bis((pyridine-2yl)methyl)ethane-1,2-diamine} were prepared and characterized. In acetonitrile solution, complex 1 did not react with nitric oxide gas. However, addition of nitric oxide gas to the acetonitrile solution of complex 2 resulted in unstable Mn(II)-nitrosyl intermediate. The formation of nitrosyl intermediate was evidenced by UV-Vis, solution FT-IR, 1 H NMR spectral studies. Subsequently, Mn(II) center in the complex 2 was undergone reduction to Mn(I) with a simultaneous N-nitrosation of the ligand. The N-nitrosated ligand was isolated and characterized. It should be noted that the corresponding Cu(II) complex of the same ligand in presence of nitric oxide was not found to yield Cu(II)-nitrosyl.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Inorganica Chimica Acta, Jun 1, 2011
Polyoxometallate (POM) clusters represent an interesting choice of building blocks for the constr... more Polyoxometallate (POM) clusters represent an interesting choice of building blocks for the construction of inorganicorganic hybrid materials. The supramolecular aggregation of several iso-and heteropolymetallate anions in presence of various organoamino ...
Department of Chemistry, Sipajhar College, Darrang-784 145, Assam, India <em>E-mail</em&... more Department of Chemistry, Sipajhar College, Darrang-784 145, Assam, India <em>E-mail</em>: aswinikalita2012@gmail.com <em>Manuscript received online 30 December 2019, revised 01 February 2020, accepted 29 April 2020</em> A copper(II) complex with bidentate ligand L [L, N-4-(phenylimino)pent-2-en-2-yl)benzenamine] was synthesized as its perchlorate salt. The single crystal structure for ligand L was determined as its chloride salt. The nitric oxide reactivity of the complex was studied in acetonitrile solvent. The formation of thermally unstable [Cu(II)-NO] intermediate on reaction of the complex with nitric oxide in acetonitrile solution was observed prior to the reduction of copper(II) centres to copper(I). The reduction was found to result with a mono nitrosation at the secondary amine site as well as C=C bond breaking of the ligand leads to the formation of an amide product. All the products were isolated and characterized spectroscopically. The X-ray singl...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DESCRIPTION Two iron(III) complexes, 1 and 2 with L1 and L2 [ L1 = N,N'-bis(2-hydroxybenzyl)-... more DESCRIPTION Two iron(III) complexes, 1 and 2 with L1 and L2 [ L1 = N,N'-bis(2-hydroxybenzyl)-1,2-diaminobenzene; L2 = N,N'-bis(2-hydroxybenzyl)ethylenediamine], respectively, were synthesized and characterized. In methanol solution of the complexes, the Fe(III) centre was found to reduce in presence of NO gas. The formation of [FeIII-NO] intermediate prior to the reduction of Fe(III) center was evidenced by UV-visible, solution FT-IR, X-band EPR studies. The presence of excess NO gas leads to the reductive nitrosylation of the complexes leading to the formation of corresponding Fe(II)-nitrosyl complexes, 3 and 4, respectively. The Fe(II)-nitrosyls were isolated as solid and characterized spectroscopically. DFT calculations were performed to optimize the structures of all the complexes.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Inorganica Chimica Acta, 2015
Manganese(II) complexes, [Mn(L)(Cl) 2 ], 1 and [Mn(L)(H 2 O) 2 ](ClO 4) 2 , 2 {L = N 1 ,N 2-bis((... more Manganese(II) complexes, [Mn(L)(Cl) 2 ], 1 and [Mn(L)(H 2 O) 2 ](ClO 4) 2 , 2 {L = N 1 ,N 2-bis((pyridine-2yl)methyl)ethane-1,2-diamine} were prepared and characterized. In acetonitrile solution, complex 1 did not react with nitric oxide gas. However, addition of nitric oxide gas to the acetonitrile solution of complex 2 resulted in unstable Mn(II)-nitrosyl intermediate. The formation of nitrosyl intermediate was evidenced by UV-Vis, solution FT-IR, 1 H NMR spectral studies. Subsequently, Mn(II) center in the complex 2 was undergone reduction to Mn(I) with a simultaneous N-nitrosation of the ligand. The N-nitrosated ligand was isolated and characterized. It should be noted that the corresponding Cu(II) complex of the same ligand in presence of nitric oxide was not found to yield Cu(II)-nitrosyl.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.