Mechanisms for magnetic exchange in some binuclear halide complexes of chromium(III) and molybdenum(III)

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Abstract
Magnetic exchange has been studied in a series of compounds of formula AI3MIII2X9 (A = univalent cation, M = Cr or Mo, X = Cl or Br) over the range 90-450�K. By correlating the variations observed with X-ray data on bond angles and metal-metal distances in the M2X93- binuclear entity, information on the relative contributions of the different mechanisms for spin-coupling has been obtained. ��� In the case of the molybdenum compounds direct exchange predominates. Superexchange through the bridging halogens constitutes a minor proportion of the total exchange but the relative contributions of the ferromagnetic and antiferromagnetic superexchange are affected by structural variations. ��� For the corresponding chromium compounds, in which the total exchange is smaller by a factor of 50 or more, superexchange is comparable in magnitude with direct exchange.

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