http://nopr.niscpr.res.in/handle/123456789/59335 Sun, 11 Oct 2026 07:52:05 GMT 2026-10-11T07:52:05Z http://nopr.niscpr.res.in/handle/123456789/59347 Title: Ion association and solvation characteristics of Li+, Na+ and K+ ions in binary mixtures of 2-Aminoethanol + N,N-Dimethylacetamide probed by conductometry study at 298.15 K and 308.15 K Authors: Kumar, Suresh; Anand, Hardeep Abstract: Molar conductances (Λ) of LiClO4, NaClO4, KSCN, Bu4NSCN, Bu4NClO4 and Bu4NBPh4 in binary solvent mixtures of 2-aminoethanol (AE) and N,N-dimethylacetamide (DMA) containing 25, 50, 60, 80 and 100 mol% DMA have been measured at 298.15 K and 308.15 K in the concentration range of (30-500) × 10-3 mol kg-1. The conductance data of the electrolytes in the binary mixtures of AE+DMA are analyzed using Shedlovsky’s equation to evaluate limiting molar conductances (Λo), association constants (KA), Walden products (Λoηo), hydrodynamic radii (RH) and the standard free energies of association (ΔGA0). The individual limiting ionic molar conductances are obtained using the reference electrolyte tetrabutylammonium perchlorate (Bu4NClO4) and tetrabutylammonium tetraphenylborate (Bu4NBPh4). A modified form of Stokes’ law helped to determine the solvated ionic radii (ri) in solutions and are assessed in the facet of ion-ion, ion-solvent interactions and show structural changes in the binary mixtures. The results has revealed that the solvated radii (ri) values of Li+, Na+ and K+ ionsshow preferential solvation of these ions by DMA in AE+DMA binary mixtures and these interactions get weaker with the increase in temperature. Also, the preferential solvation and ion-solvent interactions of these ions in binary mixtures are proved by the analysis of Walden products (Λoηo) and the standard free energies of association (ΔGA0) with the effect of temperature. Page(s): 245-253 Tue, 01 Mar 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59347 2022-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59346 Title: Syntheses, spectral characterization and antidiabetic activities of oxidovanadium(V) complexes with bi-and tridentate ligands Authors: Patel, Neetu; Patel, A K; Prajapati, A K; Jadeja, R N Abstract: Four new oxidovanadium(V) complexes [VO(L1)(Mol)] (1), [VO(L2)(Mol)] (2), [VO(L3)(Mol)] (3) and [VO(L4)(Mol)] (4)(where L1-L4 = aroylhydrazones and Mol = maltol) have been synthesized with different ligands. The complexes havebeen characterized using microanalysis, spectral fab mass, UV-visible, electrochemical (cyclic voltammetry and differentialpulse voltammetry), density functional theory calculations have been performed to predict the optimized geometry, globalreactivity parameters and electron density. In these complexes, the d-d absorption band is not observed as being d0 vanadiumcentres in these complexes. The electrochemical behaviour of these complexes are explored by cyclic voltammetry anddifferential pulse voltammetry (DPV). All complexes exhibit one electron transfer i.e., reduction of vanadium(V) tovanadium(IV). These complexes are screened for in vitro α-glucosidase and α-amylase inhibition study. Complex 3 has aninteresting insulin-like activity. Page(s): 254-262 Tue, 01 Mar 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59346 2022-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59345 Title: Heterocyclic ligated Co(II), Ni(II), Cu(II) and Zn(II) complexes for efficient photocatalytic and biological applications Authors: Joseyphus, R Selwin; R, Reshma; Arish, D Abstract: We report the synthesis and characterization techniques of mononuclear, heterocyclic ligated Co(II), Ni(II), Cu(II) and Zn(II) complexes. These heterocyclic derivatives, Schiff base (indal-2-abu), are obtained from the reaction between indole- 3-carboxaldehyde (indal) and 2-aminobutyric acid (2-abu). From the fundamental analysis, it has been found that the Schiff base with the aforementioned metal ions forms four coordinated mononuclear complexes on 1:2 (metal:ligand) stoichiometry. The structural changes of the complexes are analyzed by FT-IR, electronic and magnetic analysis. The photocatalytic dye degradation activity study of the compounds is performed under UV-light using methylene blue (MB) dye. All the complexes are found to be excellent catalysts for the degradation of MB. Molecular docking is used to recognize the energetic site of the receptor, and attain the finest geometry of the ligand-receptor complex. Furthermore, antimicrobial investigations of Schiff base and its complexes are tested and the results are discussed in detail. Page(s): 263-277 Tue, 01 Mar 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59345 2022-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59344 Title: Hydrothermal synthesis of graphene oxide/NiO and its influence on the thermal decomposition of ammonium perchlorate Authors: Jebraeil, Seyed Mohammad; Eslami, Abbas Abstract: Graphene oxide/nickel oxide (GO/NiO) nanocomposite has been successfully synthesized through a one-step hydrothermal procedure. The GO/NiO nanocomposite is characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray analysis. The influence of GO/NiO nanocomposites on the thermal decomposition of ammonium perchlorate (AP) is investigated by thermogravimetry, and differential scanning calorimetry analysis. The results reveal two stages thermal decomposition of pure AP changed to a one-stage highly exothermic process at much lower temperatures in the presence of GO/NiO nanocomposites. The released heat of AP thermal decomposition is increased from 649 J g-1 for pure AP (AP0) to 1259 and 2195 J.g-1, for AP:GO/NiO 97:3 (AP3) and 95:5 (AP5) mixtures, respectively. Furthermore, decomposition temperature of AP significantly has decreased from 419 °C (AP0) to 307 °C (AP3) and 287 °C (AP5). The kinetic parameters are calculated by Kissinger equation for thermal decomposition of AP0 and AP5. The catalytic activity of GO/NiO nanocomposite is revealed by pre-exponential factor and the calculated activation energy, also the decomposition rate constant is increased from 4.2 × 10-3 s-1 at 419 °C (pure AP) to 1.04 × 10-2 s-1 at 287 °C (peak temperature of AP5 sample). Page(s): 278-284 Tue, 01 Mar 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59344 2022-03-01T00:00:00Z