NOPR Collection:

Zeolite-encapsulated Cu(II)-salen complex as a catalyst for oxidation of cyclohexanol

2017-04-13T11:25:38Z

Title: Zeolite-encapsulated Cu(II)-salen complex as a catalyst for oxidation of cyclohexanol Authors: Ratnasamy, Chandra; Murugkar, Anupa; Padhye, Subhash; Pardhy, S A Abstract: Cu (salen) complex encapsulated in zeolite Y is characterized by elemental analysis, IR, UV-vis and ESR spectroscopy and is shown to be a catalyst for the selective oxidation of cyclohexanol to cyclohexanone in the presence of H₂O₂ under much milder conditions (80°C) than those in current practice. Page(s): 1-3

Ab initio MO studies of nuclear spin-spin coupling constants in PH, PH₃ and PH systems

2017-04-13T11:20:19Z

Title: Ab initio MO studies of nuclear spin-spin coupling constants in PH, PH₃ and PH systems Authors: Chandak, Madhulika; Chandra, P Abstract: Ab initio molecular orbital calculations of electron coupled nuclear spin-spin coupling constants are performed for PH, PH₃ and PH systems using the SCF perturbation theory. This study deals with the basis set dependence and relative importance of the major contributing terms such as orbital diamagnetic, orbital paramagnetic, spin dipolar and Fermi contact terms. In all calculations, basis sets have been augmented with bond centered functions or nuclear centered higher angular momentum functions or both. Basis sets having uncontracted 's' functions along with bond centered functions and/or polarization functions predict most of these couplings fairly satisfactorily with their experimental counterparts. Page(s): 4-11

Gamma ray induced decomposition of barium and strontium nitrates dispersed in sulphate and carbonate matrices in solid state

2017-04-13T09:28:51Z

Title: Gamma ray induced decomposition of barium and strontium nitrates dispersed in sulphate and carbonate matrices in solid state Authors: Joshi, N G; Garg, A N Abstract: The G(NO) values in gamma radiolytic decomposition of barium and strontium nitrates are enhanced by their respective sulphate and carbonate additives, their concentration and the absorbed dose. The enhancement is more significant at >95 mol % of the additive after which the increasing trend is not so significant. Thermoluminescence and ESR spectral studies suggest the formation of radical species such as SO, SO, O, CO, CO, etc. which may interact with the radical species of nitrates (NO, 'NO₂ etc). causing enhanced decomposition by energy transfer. A comparison of the carbonate and sulphate additives shows the former to be more efficient medium of energy transfer. Page(s): 12-17

Thermal and spectral studies on cellulose arylthiophosphates in air

2017-04-13T09:23:31Z

Title: Thermal and spectral studies on cellulose arylthiophosphates in air Authors: Singh, Ranbir; Arora, Sanjiv; Lal, Krishan Abstract: The thermal behaviour of cellulose and cellulose arylthiophosphate samples have been studied using DTA and TG techniques from ambient temperature to 600°C in static air atmosphere. First exotherm in DTA curves of cellulose arylthiophosphate samples caused by the decomposition process has been found to be lower than that of pure cellulose. Broido method is used to obtained various kinetic and thermodynamic parameters from TG curves. For the decomposition stage of cellulose arylthiophosphate samples, the values of the activation energies are found to be in the range of 59.10-80.77 kJ mol^-1 and are lower than that of cellulose (218.73 kJ mol^-1). The EPR signals indicate the formation of very few free radicals during the thermal degradation of cellulose and cellulose arylthiophosphate samples. Higher char yield of cellulose arylthiophosphate samples as compared to cellulose lead to the conclusion that cellulose arylthiophophates are good flame retardants. Page(s): 18-24

NOPR Collection:

Zeolite-encapsulated Cu(II)-salen complex as a catalyst for oxidation of cyclohexanol

Ab initio MO studies of nuclear spin-spin coupling constants in PH, PH3 and PH systems

Gamma ray induced decomposition of barium and strontium nitrates dispersed in sulphate and carbonate matrices in solid state

Thermal and spectral studies on cellulose arylthiophosphates in air

Ab initio MO studies of nuclear spin-spin coupling constants in PH, PH₃ and PH systems