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Exchange coupling in Cu(II) and Mn(II1) compounds with unusual structures is discussed. {[Cu( bipyrimidine) (OH) (H,O)] ( ClO,) }, has an alternatingly bridged structure with alternating ferromagnetic ( + 167.6 cm -' through the hydroxo bridge) and antiferromagnetic ( -79.8 cm -' through the bipyrimidine bridge) interactions. Copper( II) phthalate monohydrate has alternating next-nearest-neighbor exchange with J--12.3 cm -' and a = 0.06. This is the first member of this class. The compound K,[Mn( III) (salicylate) J[Mn ( III) (salicylate) J{CH,OH], has manganese ions in two environments alternating along the chain. A modified model for the chain is presented, and exchange coupling is found to be small since magnetic orbitals are not linked by the bridging ligand.

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