期刊
POLYHEDRON
卷 22, 期 7, 页码 975-979出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0277-5387(03)00022-6
关键词
cadmium(II) azido and thiocyanato complexes; pyridine derivative complexes; preparation; spectra; crystal structures
Two new polymeric cadmium(II) complexes; [Cd(3,5-DMP)(2)(N-3)(2)] (1) and [Cd(4-Brpy)(2)(NCS)(2)] (2), where 3,5-DMP = 3,5-dimethylpyridine and 4-Brpy = 4-bromopyridine, have been synthesized and characterized. IR spectral data suggest end-to-end bridging azido and thiocyanato ligands. X-ray crystal structure determination has shown the I-D complex 1 to contain each cadmium octahedrally coordinated by two double g(1,3)-bridging azides and the other two sites are occupied by two pyridine ligands in a cis-arrangement. The Cd-Cd distances in the Cd-2(N-3)(2) eight membered rings are 5.142(2) and 5.152(2) Angstrom, the azide ligands are almost symmetrical and linear [N-N distances: 1.167(5) -1.182(5) Angstrom; angle NNN = 176.7(4)degrees and 177.6(4)degrees]. In complex 2 each octahedrally cadmium atom is coordinated by two trans pyridine ligands and two trans nitrogen or sulfur atoms from four mu(N,S) bridging thiocyanato groups. The other end atoms of these four thiocyanato ligands bind four different cadmium atoms giving a 2-D layer structure. (C) 2003 Published by Elsevier Science Ltd.
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