Author:
Choong W,Stephenson NC,Ali MA,Malik MA,Phillips DJ
Abstract
The crystal structure of
Ni(dapsm)(NCS)2 [dapsm
is 2,6-bis(1-methyl-4-methylthio-5-thia-2,3-diazahexa-1,3-dienyl)pyridinel has been determined from three-dimensional
single-crystal diffractometer X-ray data. Structure refinement was carried out
by least-squares methods to a final R value of 0.059. The ligand dapsm is a potential N3S2
pentadentate, but it coordinates as a tetradentate,
giving a planar N3S donor grouping. Rotation occurs about an N-N
bond in dapsm, moving a potential donor sulfur atom
away from the nickel(II) ion. The pyridine ring of the ligand, and the N3S
donor grouping, are approximately coplanar. Two thiocyanate
groups are coordinated to the nickel, giving a distorted octahedral structure.
The structure and electronic spectrum of Ni(dapsm)-
(NCS)2 are compared with those for seven-coordinate complexes with
the related N3O2 ligand, 2,6-diacetylpyridine bissemicarbazone.
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