Synthesis and characterization of chromium(III) complexes derived from tridentate ligands: Generation of phenoxyl radical and catalytic oxidation of olefins

被引:15
作者
Ghosh, Kaushik [1 ]
Kumar, Pramod [1 ]
Goyal, Isha [1 ]
机构
[1] Indian Inst Technol, Dept Chem, Roorkee 247667, Uttar Pradesh, India
关键词
Chromium complexes; Electrochemistry; Phenoxyl radical complexes; Oxidation catalyst; SCHIFF-BASE LIGANDS; ASYMMETRIC EPOXIDATION; SELECTIVE OXIDATION; GALACTOSE-OXIDASE; NUCLEASE ACTIVITY; METAL-COMPLEXES; COPPER(II); ALCOHOLS; METALLOPORPHYRINS; DERIVATIVES;
D O I
10.1016/j.inoche.2012.07.028
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The mononuclear chromium complexes [Cr(Phimp)(2)](ClO4) (1), [Cr(N-Phimp)(2)](ClO4) (2), and [Cr( Me-Phimp)(2)](ClO4) (3) (where PhimpH= (2-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)phenol), N-PhimpH=(2-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)napthalen-1-ol). Me-PhimpH=(2-(1-(2-phenyl-2-(pyridine-2-yl)hydrazono)ethyl)phenol) where H stands for dissociable proton) were synthesized and characterized spectroscopically. Electrochemical studies were investigated for the stabilization of Cr(III) complexes and electrochemically generation of phenoxyl radical complexes. Phenoxyl radical complexes were also generated by ceric ammonium nitrate (CAN) and characterized by UV-visible spectra. The complexes were evaluated for their activity as catalysts for the epoxidation of olefins. The chromium complexes catalyzed epoxidation of olefins, viz. styrene, cis-cyclooctene and trans-stilbene with hydrogen peroxide (H2O2) as terminal oxidant, to give corresponding epoxides and oxidative products at ambient temperature. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:81 / 86
页数:6
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