A Ferroelectric Iron(II) Spin Crossover Material

Verónica Jornet-Mollá, Yan Duan, Carlos Giménez-Saiz, Yuan Yuan Tang, Peng Fei Li, Francisco M. Romero, Ren Gen Xiong

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


A dual-function material in which ferroelectricity and spin crossover coexist in the same temperature range has been obtained. Our synthetic strategy allows the construction of acentric crystal structures in a predictable way and is based on the high directionality of hydrogen bonds. The well-known iron(II) spin crossover complex [Fe(bpp)2]2+ (bpp=2,6-bis(pyrazol-3-yl)pyridine), a four-fold noncentrosymmetric H-bond donor, was combined with a disymmetric H-bond acceptor such as the isonicotinate (isonic) anion to afford [Fe(bpp)2](isonic)2⋅2 H2O. This low-spin iron(II) compound crystallizes in the acentric nonpolar I space group and shows piezoelectricity and SHG properties. Upon dehydration, it undergoes a single-crystal to single-crystal structural rearrangement to a monoclinic polar Pc phase that is ferroelectric and exhibits spin crossover.

Original languageEnglish
Pages (from-to)14052-14056
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number45
StatePublished - 6 Nov 2017
Externally publishedYes


  • ferroelectrics
  • hydrogen bonds
  • iron(II) complexes
  • solvent exchange
  • spin crossover

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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