Affiliation:
1. Al-zahra University, Faculty of Physics and Chemistry, Department of Chemistry, Tehran, Iran
Abstract
A Schiff base ligand (H2L) derived from 2?-hydroxypropiophenone and
(?)trans-1,2-cyclohexanediamine was synthesized. The reactions of MCl2.xH2O
(M =Cu(II), Co(II), Zn(II) and Mn(II))with the di-Schiff base ligand (H2L)
were studied. This ligand when stirred with 1 equivalent of CuCl2.2H2O in
the solution of ethanol and chloroform undergoes partial hydrolysis of the
imino bond and the resultant tridentate ligand (HL?)immediately forms
complex[CuL?Cl]?3/2CHCl3(1)with N2O coordination sphere. Under the same
condition, the reaction of H2L with MCl2.xH2O (M = Co(II) (3), Zn(II) (4)
and Mn(II) (5)) gave complexes[ML]?1/2CHCl3?3/2H2O (3-5)with N2O2
coordination sphere and no hydrolytic cleavage was occurred. Also, the
reaction of H2L with CuCl2.2H2O in THF gave the complex CuL (2)with N2O2
coordination sphere. The ligand and complexes were characterized by FTIR,
UV-Vis, 1H NMRand elemental analysis. The homogeneous catalytic activity of
the complexes1, 3 and 5wasevaluated for the oxidation of styrene using
tert-butyl hydroperoxide (TBHP) as oxidant. Finally, the copper(II)
complex(1)encapsulated in the nanopores of zeolite-Y by flexible ligand
method (CuL?-Y)and its encapsulation was ensured by different studies. The
catalytic performance of heterogeneous catalyst in the styrene oxidation
with TBHP was investigated. The catalytic tests showed that the homogenous
and heterogeneous catalysts were active in the oxidation of styrene.
Publisher
National Library of Serbia