Issue 8, 1989

Stacked planar molecules in antiferromagnetic di-isothiocyanato-bis(thiourea)chromium(II), a new structural type for chromium(II)

Abstract

The Structure of [Cr(NCS)2(tu)2] where tu is thiourea, comprises trans-planar units stacked along the a axis in infinite parallel chains with a Cr ⋯ Cr separation of 3.97 Å. The separation between sulphur atoms in neighbouring chains is less than a van der walls diameter, and so S ⋯ S interactions may contribute to the stack formation. Other bond lengths in the co-ordination sphere are Cr–NCS 2.026(3)Å and Cr–S(tu) 2.486(1)Å. The temperature dependent magnetic behaviour (µeff.= 453 at 291 K and 4.05 at 90 K) can be reproduced by substituion of J=–2.7 cm–1 and g= 1.96 in Smith and Friedberg's expression for antiferromagnetism in a chain of interacting spin with S= 2. The weak interaction probably arises from direct Cr ⋯ Cr interaction but weak interchain interaction cannot be excluded.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1989, 1631-1633

Stacked planar molecules in antiferromagnetic di-isothiocyanato-bis(thiourea)chromium(II), a new structural type for chromium(II)

J. Jubb, L. F. Larkworthy, G. A. Leonard, D. C. Povey and B. J. Tucker, J. Chem. Soc., Dalton Trans., 1989, 1631 DOI: 10.1039/DT9890001631

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