http://nopr.niscpr.res.in/handle/123456789/58300 2026-10-10T20:39:16Z 2026-10-10T20:39:16Z Alam, Md Mahbub Islam, Fahima Abedin, Tareque SM Kabir, Shariff E Azam, Kazi A http://nopr.niscpr.res.in/handle/123456789/58301 2021-10-14T11:46:39Z 2021-10-01T00:00:00Z

Title: Dirhenium carbonyl compounds bearing cis-1,2-bis(diphenylphosphino)ethylene and cis-1,2-bis(diphenylphosphino)ethylene oxide ligands Authors: Alam, Md Mahbub; Islam, Fahima; Abedin, Tareque SM; Kabir, Shariff E; Azam, Kazi A Abstract: Reaction of [Re2(CO)9(MeCN)] with cis-1,2-bis(diphenylphosphino)ethylene (cis-Ph2PCH=CHPPh2) in boiling benzene (80 °C) afforded two compounds, ax-[Re2(CO)9(κ1-cis-Ph2PCH=CHPPh2)] (1) and ax-[Re2(CO)9{κ1-cis- Ph2PCH=CHPh2P(O)}] (2) where the ligand is axially coordinated in a κ1 monodentate fashion through phosphorus. The close-bridged compound eq-[Re2(CO)8(μ-κ2-cis-Ph2PCH=CHPPh2)] (3) is obtained from a similar reaction of the same ligand with [Re2(CO)8(NCMe)2] in refluxing benzene. In this case the diphosphine is equatorially coordinated to two Re atoms in a symmetrical bridging fashion. Compounds 1−3 have been characterized by IR, 1H NMR, 31P{1H} NMR spectroscopy and single crystal X-ray diffraction analyses. Page(s): 1289-1295

2021-10-01T00:00:00Z Patyar, Poonam Kaur, Gurpreet http://nopr.niscpr.res.in/handle/123456789/58305 2021-10-14T11:49:24Z 2021-10-01T00:00:00Z

Title: Thermophysical studies of protonated and deprotonated glycine in aqueous sodium acetate buffer solutions at different temperatures Authors: Patyar, Poonam; Kaur, Gurpreet Abstract: Interactions of glycine in water and in (0.10, 0.50 and 1.00) mol kg−1 aqueous sodium acetate buffer solutions of pH(1.00 and 12.40) have been investigated at different temperatures, T(K) = (298.15-318.15). Densities, 𝜌 and viscosities, 𝜂 of glycine in water and in aqueous sodium acetate buffer solutions have been measured. The obtained density data have been used to calculate apparent molar volume, 𝜙𝑣, limiting partial molar volume, 𝜙𝑣𝑜, limiting partial molar volumes of transfer,Δ𝑡𝑟𝜙𝑣. Viscosity B-coefficient, viscosity B-coefficient of transfer, Δ𝑡𝑟𝐵, activation free energies per mole of the solute,Δ𝜇2𝑜# and solvent, Δ𝜇1𝑜# have been calculated from viscosity data. Further, second order derivative of partial molarexpansion coefficient and dependence of 𝑑𝐵𝑑𝑇 coefficients on temperature is useful in measuring the structure making and breaking behaviour of solute in these systems. Pair and triplet interaction coefficients for both the properties were also calculated. Thus, the results obtained from volumetric and viscometric studies are of considerable importance to identify different type of interactions (i.e. H-bonding, van der Waals interactions) in these systems. Page(s): 1317-1328

2021-10-01T00:00:00Z Lal, Basant http://nopr.niscpr.res.in/handle/123456789/58303 2021-10-14T11:48:32Z 2021-10-01T00:00:00Z

Title: Elctrocatalytic oxygen evolution reaction on Mg, Al and Fe doped spinel oxides Authors: Lal, Basant Abstract: Metal doped cobalt-based spinel type catalysts prepared by co-precipitation route are considered as suitable candidates for OER, ORR, metal air batteries, fuel cells, detoxification of water, etc. For the purpose, metal doped oxides with formula MCo2O4 (M= Mg, Al and Fe) have been prepared by thermal decomposition of their metal carbonate precipitates and characterized by IR, XRD, CV, EIS and Tafel polarization techniques. The FTIR spectra of oxides show absorption bands ~ 650 cm-1 and ~ 560 cm-1 for respective stretching and bending modes of vibration of Co-O bond at octahedral sites and formation of nano-size (~ 18 nm) single phase cubical crystal with spinel geometry is confirmed by powder XRD patterns. The cyclic voltammetric curves of oxide electrodes in 1 M KOH solution showed a redox peak at Eo = 434 -516 mV for Co2+/Co3+ reactions. The electrocatalytic activity of oxide electrodes for oxygen evolution reaction in 1 M KOH at 25 °C was also studied by Tafel polarization technique and polarization curve of each oxides showed two Tafel slopes and order of OER is unity. Page(s): 1303-1308

2021-10-01T00:00:00Z Sharma, Vinita Sanwaria, Anita Raj Sharma, Nikita http://nopr.niscpr.res.in/handle/123456789/58304 2021-10-14T11:49:08Z 2021-10-01T00:00:00Z

Title: Synthesis and characterization of some binuclear alkylene dithiophosphate complexes of bis(acetylacetonato)aluminium(III)-di-(μ-isopropoxo)di-isopropoxoaluminium(III) and sol-gel synthesis of nanosized θ-alumina Authors: Sharma, Vinita; Sanwaria, Anita Raj; Sharma, Nikita Abstract: Reactions of bis(acetylacetonato)aluminum(III)-di-(μ–isopropoxo)-di-isopropoxoaluminum(III) (A) with a variety of alkylenedithiophosphoric acids in different molar ratio yield products of the type [(CH3COCHCOCH3)2Al(μ-OPri)2Al{S(S)P(O-G-O)n(OPri)2-n] (1-9) {where G = C(CH3)2C(CH3)2, n=1[1], n=2[2]; -CH2CH(C2H5), n=1[3], n=2[4];CH2CH(CH3), n=1[5], n=2[6];C(CH3)2CH2CH(CH3), n=1[7]; CH(CH3)CH(CH3) n=1[8], n=2[9]}. Progress of the reaction is monitored by estimating liberated 2-propanol in benzene-2-propanol azeotrope by oxidimetric method. All pale coloured viscous products were soluble in common organic solvents and are characterized by elemental analyses, FT-IR and NMR (1H and 13C{1H} NMR) spectral studies. Molecular weight measurements in refluxing anhydrous benzene indicated binuclear nature of the complexes. 27Al NMR spectra of two of the derivatives, (1) and (2), suggested the presence of aluminium(III) atoms in different coordination states. 31P NMR spectra of the representative derivatives (1) and (2) exhibited only a single peak at 95.71 and 90.59 ppm, respectively, suggesting tetra-coordination around phosphorus atom and a bidentate mode of chelation of the dithio ligand. Sol-gel transformation of Al(OPri)3 and [(CH3COCHCOCH3)2Al(μ-OPri)2Al(OPri)2] (A) followed by sintering at ~850 °C yield alumina (a) and (b), respectively. The powder X-ray diffractionpatterns, SEM images and FT-IR spectral studies of (a) and (b) has indicated formation of nano-crystallites of θ -Al2O3 [PDF # 110517] in both the cases. The energy band gaps of 4.78 eV and 5.01 eV for (a) and (b), respectively are obtained from the absorption spectra. Page(s): 1309-1316

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