http://nopr.niscair.res.in/handle/123456789/13613 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/13657 Title: Coordination chemistry of the multi-funtionalized 3-(diphenylphosphino)-1-propylamine ligand with ruthenium(II) <br/> <br/>Authors: Borah, Geetika; Boruah, Devajani <br/> <br/>Abstract: The reaction of RuCl₂(PPh₃)₃ with two molar equivalents of a multi-functionalized ligand, 3-diphenylphosphino-1-propylamine (DPPA) yields two mononuclear, low spin, diamagnetic, octahedral neutral complexes, [RuCl₂(η²-P,N-DPPA)₂] (<b style="">1</b>) and [RuCl₂(η²-P,N-DPPA)(PPh₃)₂] (<b style="">2</b>). The complexes have been characterized by conductivity measurements, FTIR, UV-vis, ¹H and variable temperature ³¹P{¹H} NMR, ESI(+)MS, TGA-DTG and cyclic voltammetry. The ESI(+) mass spectrogram of (<b style="">1)</b> shows molecular ion peak at <i style="">m/z</i> 658[M]⁺, indicating mononuclear nature of the complex . No fluxional behavior is observed from the variable temperature (200-300 K) ³¹P{¹H} NMR spectra. The complexes (<b style="">1) </b>and (<b style="">2) </b>upon treatment with CH₃CN in 1:1 molar ratio in the presence of NH₄PF₆ in dichloromethane solution afford the six-coordinate cationic complexes [RuCl(η²-P,N-DPPA)₂(CH₃CN)](PF₆) (<b style="">3</b>) and [RuCl(η²-P,N-DPPA)(CH₃CN)(PPh₃)₂](PF₆) (<b style="">4</b>), respectively. The complexes (<b style="">3)</b> and<b style=""> (4) </b>have also been characterized by FTIR, ESI(+)MS,¹H and ³¹P{¹H} NMR spectra at room temperature. The complexes (<b style="">1)</b> and (<b style="">2) </b>are found to<b style=""> </b>have high catalytic activity towards the oxidation of aromatic alcohols with H₂O₂/NaOCl as oxidant. Maximum conversion of 95% can be achieved under mild reaction conditions. <br/> <br/>Page(s): 444-452 http://nopr.niscair.res.in/handle/123456789/13656 Title: Photocatalytic degradation of an azo dye, Acid Red 27, in aqueous solution using nano ZnO <br/> <br/>Authors: Shanthi, M; Kuzhalosai, V <br/> <br/>Abstract: Photocatalytic degradation of Acid Red 27 by nano ZnO has been investigated under different conditions. Optimum experimental conditions on catalyst amount, <i style="">p</i>H and dye concentration have been determined. Addition of some inorganic oxidizing species such as H₂O₂, K₂S₂O₈ and KBrO₃ up to a certain concentration increases the rate of degradation. The photodecolourisation and degradation kinetics are discussed in terms of Langmuir-Hinshelwood kinetic model. <br/> <br/>Page(s): 428-434 http://nopr.niscair.res.in/handle/123456789/13655 Title: Synergetic influence of mercaptoacetic acid on the reaction of thiourea with methylene blue in acidic medium <br/> <br/>Authors: Mishra, K K; Dwivedi, Upasana <br/> <br/>Abstract: Thiourea and methylene blue interact in a mole ratio of 2:1 in the presence of HCl forming the corresponding disulphide and leucomethylene blue. The order in thiourea is unity while that in methylene blue is zero at higher concentrations (<i style="">ca</i>.>2.5×10^-5<i style="">M</i>). At lower concentrations, the order in methylene blue is -1/2; this kinetic deviation depends on the nature of the thiol acid exhibiting synergetic effect. Mercaptoacetic acid does not react with methylene blue under the prevailing conditions; however it exerts a synergetic effect on the reaction. The rate increases linearly on increasing [H⁺] with the reaction having a large negative entropy of activation. Electrospray induced mass spectrometry, ¹H NMR and FTIR data indicate the participation of a persulphide-like species formed due to thiourea–mercaptoacetic acid interaction, which is perhaps responsible for the synergetic effect of mercaptoacetic acid. <br/> <br/>Page(s): 458-463 http://nopr.niscair.res.in/handle/123456789/13654 Title: Selective oxidation of cyclohexane to KA-oil with oxygen over active Co₃O₄in a solvent-free system <br/> <br/>Authors: Lu, X-H; Yuan, H-X; Lei, J; Zhang, J-L; Yu, A-A; Zhou, D; Xia, Q-H <br/> <br/>Abstract: Heterogeneous oxidation of liquid cyclohexane with molecular oxygen was carried out in a solvent-free system initiated by various catalysts and additives. Among those catalysts tested, the Co₃O₄ catalyst prepared by a simple calcination at 550 °C was relatively active for the oxidation of cyclohexane to KA-oil (a mixture of cyclohexanone and cyclohexanol), and could achieve about 9.2 mol% conversion of cyclohexane and 92.7 % selectivity of KA-oil at 130 °C under the pressure of 1.0 MPa O₂ for 2 h, comparable to those of Co₃O₄ nanocrystals and Co/ZSM-5. This would help to widen the scope of the catalysts available for the titled oxidation. The use of peroxides and NHPI as the initiators without any catalyst could lead to the occurrence of non-catalytic oxidation of cyclohexane as well. <br/> <br/>Page(s): 420-427