Abstract

A cyanido-bridged FeII-NbIV spin-crossover complex, [FeII(dpds)2]2[NbIV(CN)8]·6H2O (dpds = 4,4′-dipyridyldisulfide), is synthesized with a three-dimensional coordination network. The network has cyanido bridges to connect the FeII and NbIV sites and dpds as an additional ligand to crosslink the FeII sites. [FeII(dpds)2]2[NbIV(CN)8]·6H2O exhibits a gradual and incomplete spin crossover in which 22% of the high-spin FeII sites change to low-spin FeII sites as the temperature decreases. The calculation indicates that the spin transition occurs sparsely, rather than forming low spin site domains.

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