Crystal and molecular structures of the antiferromagnetic linear chain halide-bridged complexes [CrX2(MeCN)2](X = Cl or Br)
Abstract
Single-crystal X-ray analysis has shown that the acetonitrile complex [CrBr2(MeCN)2] is a bromide-bridged linear polymer in which the metal atom is in distorted octahedral co-ordination, with metal–ligand bond distances Cr–N 2.066(4), Cr–Br, two at 2.545(0) and two at 2.976(1)Å. The Cr … Cr separation is 4.054(4)Å. The complexes [CrBr2(MeCN)2] and [CrCl2(MeCN)2] are isomorphous, and both are antiferromagnetic (J≈– 1.5 cm–1g= 2.0).
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