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Proposed structure of the polymeric [Fe(4R-1,2,4-triazole)3]2+ spin crossover cation (a) and plot of γHS versus T at different pressures for [Fe(hyptrz)3](4-chlorophenylsulfonate)2·H2O (b). (Reproduced with permission from [159]. Copyright 2005 Elsevier B. V.).
