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Diamagnetic [NH4][Co8(MeCO2)8(OMe)16][PF6], a compound with eight cobalt atoms bridged by methoxy and acetato ligands so as to form a planar ring with an ammonium ion at its centre, is isolated from the reaction between cobalt(III) acetate and methanol in the presence of NH4PF6.
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Beattie et al. (1998) studied this question.
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