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Structures and UV‐Visible Absorption Properties of Unsymmetrical Bisdithiolene Nickel Complexes
Author(s) -
Wang ChihChieh,
Wu WeiChing,
Lee GeneHsiang,
Chen ChinTi
Publication year - 2002
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200200115
Subject(s) - chemistry , nickel , solvatochromism , crystallography , absorption (acoustics) , moiety , ligand (biochemistry) , absorption spectroscopy , crystal structure , piperazine , stereochemistry , photochemistry , molecule , organic chemistry , optics , biochemistry , physics , receptor
A new unsymmetrical bisdithiolene nickel complex Ni(Et 2 dazdt)(mnt) was synthesized and structurally characterized, where Et 2 dazdt and mnt denote 1,4‐diethyl‐perhydrodiazepine‐2,3‐dithione and maleonitrildithiolate, respectively. Its crystal structure and absorption spectrum were determined and compared to those of Ni(Et 2 pipdt)(mnt), where Et 2 pipdt is 1,4‐diethyl‐piperazine‐2,3‐dithione. X‐ray diffraction analysis reveals that the Ni(S 2 C 2 ) 2 moiety of Ni(Et 2 dazdt)(mnt) is not planar due to the twist conformation of a seven‐member ring of Et 2 dazdt ligand. The twisting of Et 2 pipdt is less severe and NiS 4 center of Ni(Et 2 pipdt)(mnt) possesses a closer to planar conformation than that of Ni(Et 2 dazdt)(mnt). Unlike Ni(Et 2 pipdt)(mnt), Ni(dazdt)(mnt) shows two major separated absorption bands in the visible and near‐IR region, although both absorption bands show negative solvatochromism similar to that of Ni(Et 2 pipdt)(mnt).