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[Cr$_{4}$S(O$_{2}$CCH$_{3}$)$_{8}$(H$_{2}$O)$_{4}$](BF$_{4}$)$_{2}\cdot $H$_{2}$O: Ferromagnetically Coupled Cr$_{4}$S Cluster with Spin 6 Ground State

A. Bino, D. C. Johnston, D. P. Goshorn, T. R. Halbert and E. I. Stiefel
Science
New Series, Vol. 241, No. 4872 (Sep. 16, 1988), pp. 1479-1481
Stable URL: http://www.jstor.org/stable/1702677
Page Count: 3
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[Cr$_{4}$S(O$_{2}$CCH$_{3}$)$_{8}$(H$_{2}$O)$_{4}$](BF$_{4}$)$_{2}\cdot $H$_{2}$O: Ferromagnetically Coupled Cr$_{4}$S Cluster with Spin 6 Ground State
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Abstract

Data on the preparation, structure, and magnetism of the new complex [Cr$_{4}$S(O$_{2}$CCH$_{3}$)$_{8}$(H$_{2}$O)$_{4}$](BF$_{4}$)$_{2}\cdot $H$_{2}$O are presented. The metal-sulfur M$_{4}$S core structure is similar to that found in M$_{4}$S[S$_{2}$As(CH$_{3}$)$_{2}$]$_{6}$ (where M is cobalt or zinc) compounds and in beryllium basic acetate. However, the six-coordinate metal ions in the new Cr$_{4}$S system distinguish it from these structures. The tetranuclear chromium complex is the first example of a new structural type. Its magnetic spin S = 6 ground state, a striking example of intramolecular ferromagnetic coupling, was determined by variable-temperature magnetic susceptibility measurements. Long-range antiferromagnetic intercluster ordering was found below 170 millikelvin.

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