6533b834fe1ef96bd129cdaf
RESEARCH PRODUCT
A Ferroelectric Iron(II) Spin Crossover Material
Verónica Jornet-molláYan DuanCarlos Giménez-saizYuan-yuan TangPeng-fei LiFrancisco M. RomeroRen-gen Xiongsubject
010405 organic chemistryChemistryHydrogen bondInorganic chemistryGeneral MedicineGeneral ChemistryCrystal structure010402 general chemistry01 natural sciencesAcceptorFerroelectricityCatalysis0104 chemical sciencesCrystallographySpin crossoverPhase (matter)Acentric factorMonoclinic crystal systemdescription
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)₂·2H₂O. This low-spin iron(II) compound crystallises in the acentric nonpolar I-4 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-10-04 | Angewandte Chemie International Edition |