http://nopr.niscair.res.in/handle/123456789/519 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/640 Title: Photocatalytic degradation of sunset yellow FCF in presence of some transition metal complexes and hydrogen peroxide <br/> <br/>Authors: Lodha, Savitri; Jain, Abhilasha; Sharma, VK; Punjabi, Pinki B <br/> <br/>Abstract: The photocatalytic degradation of sunset yellow FCF by thiocyanate complexes of iron, copper and cobalt and hydrogen peroxide is reported here. The effect of different parameters, such as the pH, concentration of the complexes and dye, amount of H₂O₂ and light intensity on the rate of photocatalytic degradation has also been studied. The mechanism for degradation of the dye is also proposed. <br/> <br/>Page(s): 397-400 http://nopr.niscair.res.in/handle/123456789/638 Title: Vitamin K₃ encapsulated poly(vinylpyrrolidone) film modified glassy carbon electrode for studying the vitamin K₃ – caffeine interaction <br/> <br/>Authors: Das, Diganta Kumar; Bhattacharjya, Rimki <br/> <br/>Abstract: The cathodic and anodic peak currents in cyclic voltammogram of vitamin K₃ encapsulated polyvinyl pyrollidone film modified glassy carbon electrode decrease with addition of caffeine (from 0.02 μM to 0.2 μM) in the electrolytic solution. Caffeine converts vitamin K₃ into diphenylenetetranol, which is electrochemically inactive. This interaction between vitamin K₃ and caffeine is not observed when both are in solution. <br/> <br/>Page(s): 394-396 http://nopr.niscair.res.in/handle/123456789/637 Title: Proton transfer equilibria between o-substituted benzoic acids and the carbinol base of crystal violet in apolar aprotic solvents: Chemometric analysis of ortho effect <br/> <br/>Authors: Sengupta, Susanta K; Mishra, Sangeeta <br/> <br/>Abstract: Toluene-phase reaction equilibria between a set of o-substituted benzoic acids and crystal violet carbinol base producing a coloured ion-pair have been studied spectrophoto-metrically at 28±1ºC. Chemometric analysis on the basis of both Charton’s and Fujita-Nishioka’s multiparameter approaches for o-substituent effects on the equilibrium constants show that proximity electronic effect of an o-substituent is the main intrinsic contribution to the anomalous ortho effect with its steric factor contributing merely a minor effect. However, in the aqueous phase the steric contribution becomes significant due to hydration induced substantial enhancement in the bulk of the COOH group and the o-substituent. <br/> <br/>Page(s): 390-393 http://nopr.niscair.res.in/handle/123456789/635 Title: Cyclohexylation of phenol over a solid acid catalyst comprising 12-tungstophosphoric acid and hydrous zirconia <br/> <br/>Authors: Bhatt, Nikunj; Patel, Anjali <br/> <br/>Abstract: The Friedel-Crafts alkylation (cyclohexylation of phenol with cyclohexene) has been carried out over 12-tungstophosphoric acid supported on hydrous zirconia under mild conditions. The catalyst shows high activity and selectivity for 2-cyclohexyl phenol, an important product used as intermediate in dyestuff preparation as well as in preparation of 2-phenyl phenol which is used as disinfectant and fungicide. In addition, the catalyst can be recycled and reused. <br/> <br/>Page(s): 387-389