Journal
INORGANICA CHIMICA ACTA
Volume 394, Issue -, Pages 247-254Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2012.07.007
Keywords
Nickel(II); Cadmium(II); Hetero-metallic complexes; Crystal structure; Polymorphism; Isomorphism
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Funding
- CSIR, India [09/028 (0805)/2010-EMR-I]
- EPSRC
- University of Reading
- DST-FIST, India
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Four new trinuclear hetero-metallic nickel(II)-cadmium(II) complexes [(NiL)(2)Cd(NCS)(2)] (1A and 1B), [(NiL)(2)Cd(NCO)(2)] (2) and [(NiL)(2)Cd(N-3)(2)] (3) have been synthesized using [NiL] as a so-called ligand complex (where H2L = N,N'-bis(salicylidene)-1,3-propanediamine) and structurally characterized. Crystal structure analyses reveal that all four complexes contain a trinuclear moiety in which two square planar [NiL] units are bonded to a central cadmium(II) ion through double phenoxido bridges. The Cd(II) is in a six-coordinate distorted octahedral environment being bonded additionally to two mutually cis nitrogen atoms of terminal thiocyanate (in 1A and 1B), cyanate (in 2) and azide (in 3). Complexes 1A and 1B have the same molecular formula but crystallize in very different monoclinic unit cells and can be considered as polymorphs. On the other hand, the two isoelectronic complexes 2 and 3 are indeed isomorphous and crystallize only in one form. Their conformation is similar to that observed in 1A. (C) 2012 Elsevier B. V. All rights reserved.
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