Ferromagnetic and antiferromagnetic interactions within and between the chains, respectively, result in metamagnetism in the first one-dimensional coordination polymer to include alternating high-spin (HS; S=2) and low-spin (LS; S=1) MnIII centers bridged by cyano groups, namely, [{Mn(salen)CN}n] (salen=bis(salicylidene)ethylenediamide; see schematic drawing).
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Matsumoto et al. (1999) studied this question.