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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 ⋅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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Bino et al. (1988) studied this question.
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