Tris-chelate complexes of cobalt(III) with N-[di(alkyl/aryl)carbamothioyl] benzamide derivatives: Synthesis, crystallography and catalytic activity in TBHP oxidation of alcohols
作者:N. Gunasekaran、P. Jerome、Seik Weng Ng、Edward R.T. Tiekink、R. Karvembu
DOI:10.1016/j.molcata.2011.11.019
日期:2012.2
New six coordinated tris-chelate cobalt(III) complexes of the type [Co(L)(3)] (1-4) where HL = N-[di(alkyl/aryl)carbamothioyl]benzamide derivatives} were prepared from the reaction between CoCl2 center dot 6H(2)O and N-[di(alkyl/aryl)carbamothioyl]benzamide in ethanol and characterized by elemental analysis and spectral data (UV/Vis, IR,H-1 & (CNMR)-C-13). The molecular structure of a representative complex [Co(L1)(3)] (1) [where HL1 = N-(diisopropylcarbamothioyl)benzamide], was determined by single crystal X-ray diffraction method and reveals a distorted octahedral geometry and a facial configuration of S atoms around the Co(III) center. These complexes act as efficient catalysts for the oxidation of alcohols to their corresponding aldehydes or ketones in presence of tert-butyl hydroperoxide (TBHP) at 80 degrees C. (C) 2011 Elsevier B.V. All rights reserved.