555-06-6Relevant articles and documents
Yeast supported gold nanoparticles: an efficient catalyst for the synthesis of commercially important aryl amines
Krishnan, Saravanan,Patel, Paresh N.,Balasubramanian, Kalpattu K.,Chadha, Anju
supporting information, p. 1915 - 1923 (2021/02/06)
Candida parapsilosisATCC 7330 supported gold nanoparticles (CpGNP), prepared by a simple and green method can selectively reduce nitroarenes and substituted nitroarenes with different functional groups like halides (-F, -Cl, -Br), olefins, esters and nitriles using sodium borohydride. The product aryl amines which are useful for the preparation of pharmaceuticals, polymers and agrochemicals were obtained in good yields (up to >95%) using CpGNP catalyst under mild conditions. The catalyst showed high recyclability (≥10 cycles) and is a robust free flowing powder, stored and used after eight months without any loss in catalytic activity.
Silver nanoparticles stabilized by a polyaminocyclodextrin as catalysts for the reduction of nitroaromatic compounds
Russo, Marco,Armetta, Francesco,Riela, Serena,Chillura Martino, Delia,Meo, Paolo Lo,Noto, Renato
, p. 250 - 261 (2015/09/01)
Silver nanoparticles stabilized by means of poly-(6-N,N-dimethyl-propylenediamino)-(6-deoxy)-β-cyclodextrin were synthesized, characterized by different techniques (UV-vis spectroscopy, Dynamic Light Scattering, High Resolution Transmission Electron Microscopy, Fourier-transform IR Spectroscopy) and used as catalysts for the reduction of various nitrobenzene derivatives with sodium borohydride. The nanocomposites obtained appear to have an organized structure, with a metal core surrounded by a layer-structured coating shell. Kinetic data, rationalized in terms of a modified Langmuir-Hinshelwood model, evidenced a non-linear dependence of the reaction rate on the concentration of the catalyst. This was explained on the grounds of the catalytic activity of differently covered catalyst areas. Careful analysis of kinetic data, in particular the effect of the para substituent on the nitroarene structure and the trends of the induction period observed at the beginning of the reaction, provided with interesting insights on the reaction course, and brought us to critically reconsider several mechanistic ideas reported in previous literature.
A light-powered stretch-contraction supramolecular system based on cobalt coordinated [1]rotaxane
Gao, Chao,Ma, Xiang,Zhang, Qiong,Wang, Qiaochun,Qu, Dahui,Tian, He
supporting information; experimental part, p. 1126 - 1132 (2011/04/15)
A mechanically switchable bistable [1]rotaxane, constituted of azobenzene modified cyclodextrins (CyDs) and a Schiff base bridged by a metallosalen unit, was designed and synthesized. 1H NOESY NMR and ICD spectra were investigated to characterize the movement process of this stretch-contraction supramolecular system. The geometries of [1]rotaxane before and after irradiation by UV light were optimized and calculated. Coordinated with cobalt(iii) ion, the rotaxane becomes more rigid and linear, which is seen from the more obvious signals in the induced circular dichroism (ICD) and 1H NMR spectra. This type of light-powered [1]rotaxane has favourable repeatability and exhibits a novel approach to elaborate the transformation of a light-driven molecular machine.