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The development of recording media based on molecular spin‐transition (ST) materials is discussed and applications demonstrated for the first time. The figure shows a compound which exhibits an ST and which is based on Fe II and 1,2,4‐triazole units. The central Fe II ion undergoes an ST at around 210 K which is accompanied by a purple‐white color change. Requirements for future progress are reviewed. magnified image
Kahn et al. (1992) studied this question.