3 years ago

A Ferroelectric Iron(II) Spin Crossover Material

A Ferroelectric Iron(II) Spin Crossover Material
Carlos Giménez-Saiz, Francisco M. Romero, Ren-Gen Xiong, Yuan-Yuan Tang, Peng-Fei Li, Yan Duan, Verónica Jornet-Mollá
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 I4‾ 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. A two-in-one crystal: A designed strategy is reported for the assembly of iron(II) spin crossover complexes into noncentrosymmetric crystal structures based on hydrogen bonding. A piezoelectric low-spin compound was obtained that undergoes a reversible single-crystal to single-crystal dehydration to yield a dual-function material exhibiting ferroelectricity and spin crossover.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707401

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