期刊
POLYHEDRON
卷 23, 期 18, 页码 3081-3085出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2004.09.024
关键词
copper(II) complex; Schiff base; X-ray structure; imine activation; coordination polymer
A new copper(II) complex [Cu(HL)(ClO4)](ClO4) (1), where HL is a multidentate Schiff base N,N'-(2-hydroxypropane-1,3-diyl)bis(pyridine-2-aldimine), is prepared, structurally characterized by X-ray crystallography and its spectral and electrochemical properties studied. The complex forms a one-dimensional chain in the solid state structure in which the monomeric {Cu(HL)} units are linked by the perchlorate ligand. The complex has an axially elongated six coordinate geometry (4+2) with a CuN4O2 core in which the Schiff base ligand displays a tetradentate mode of bonding in the basal plane. The axial ligand is perchlorate with a significantly long Cu-O bond of ca. 2.6 Angstrom. The one-electron paramagnetic complex displays a cyclic voltammetric response for the Cu(II)/Cu(I) couple at 0.01 V versus SCE in MeCN-0.1 M TBAP. The azomethine bond of the Schiff base in 1 on treatment with H2O2 undergoes oxidative conversion to form a bis(picolinato)copper(II)-dihydrate species through the formation of an amido intermediate as evidenced from the solution infrared spectral studies. (C) 2004 Published by Elsevier Ltd.
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