Abstract
It is not possible to isolate phenylantimony dithiocyanate from phenylantimony dichloride (1 mol) and 2 equivalents of potassium thiocyanate in acetonitrile and a salt, K[SbPh(SCN)3], is isolated instead. A tetrathiocyanate salt, K2[SbPh(SCN)4], has also been isolated and K[SbPh2(SCN)2] can be obtained from SbPh2(SCN) and K(SCN). In K[SbPh(SCN)3], X-ray diffraction shows that all the thiocyanate groups are S-bonded and the compound has an unusual polymeric structure in which the sulfur atom of one thiocyanate group bridges between pairs of antimony atoms. Co-ordination about antimony is square pyramidal with an apical phenyl group and sulfur atoms of two terminal (Sb–S 2.573, 2.595 Å) and two cis 1,1-sulfur bridging thiocyanate groups (Sb–S 2.938, 2.999 Å) forming the basal plane. All thiocyanate groups are oriented in the same fashion leading to distorted octahedral co-ordination about potassium.
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