Non-classical Fe(II) spin-crossover behaviour leading to an unprecedented extremely large apparent thermal hysteresis of 270 K: application for displays

Yann Garcia, Petra J. Van Koningsbruggen, Epiphane Codjovi, Rene Lapouyade, Olivier Kahn, Louis Rabardel

Research output: Contribution to journalArticle

Abstract

[Fe(hyetrz) 3 ](anion) 2 ·3H 2 O [hyetrz=4-(2′-hydroxyethyl)-1,2,4-triazole, anion=3-nitrophenylsulfonate] is a novel linear polynuclear Fe II spin-crossover compound. The low-spin to high-spin transition accompanied by a pronounced thermochromic effect occurs at 370 K in a very abrupt way. Just before this temperature, the three non-coordinated water molecules are removed. The dehydrated high-spin form remains stable down to ca. 100 K, where it transforms into a new low-spin form, implying that this material shows an apparent thermal hysteresis width of 270 K. Applications of this material are discussed.
Original languageEnglish
Pages (from-to)857-858
Number of pages2
JournalJournal of Materials Chemistry
Volume7
DOIs
Publication statusPublished - 1997

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