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

doi:10.1002/anie.201707401

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 journal › Article › peer-review

47 Scopus citations

Abstract

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 language	English
Pages (from-to)	14052-14056
Number of pages	5
Journal	Angewandte Chemie - International Edition
Volume	56
Issue number	45
DOIs	https://doi.org/10.1002/anie.201707401
State	Published - 6 Nov 2017
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Catalysis
Chemistry (all)

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10.1002/anie.201707401

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title = "A Ferroelectric Iron(II) Spin Crossover Material",

abstract = "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.",

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author = "Ver{\'o}nica Jornet-Moll{\'a} and Yan Duan and Carlos Gim{\'e}nez-Saiz and Tang, {Yuan Yuan} and Li, {Peng Fei} and Romero, {Francisco M.} and Xiong, {Ren Gen}",

note = "Funding Information: This work has been supported by the Spanish MINECO (CTQ2014-52758-P, MAT2014-56143-R), Generalitat Valenciana (PrometeoII/2014/076) and National Natural Science Foundation of China (21290172, 91422301). Publisher Copyright: {\textcopyright} 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Jornet-Mollá, Verónica

AU - Duan, Yan

AU - Giménez-Saiz, Carlos

AU - Tang, Yuan Yuan

AU - Li, Peng Fei

AU - Romero, Francisco M.

AU - Xiong, Ren Gen

N1 - Funding Information: This work has been supported by the Spanish MINECO (CTQ2014-52758-P, MAT2014-56143-R), Generalitat Valenciana (PrometeoII/2014/076) and National Natural Science Foundation of China (21290172, 91422301). Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2017/11/6

Y1 - 2017/11/6

N2 - 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.

AB - 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.

KW - ferroelectrics

KW - hydrogen bonds

KW - iron(II) complexes

KW - solvent exchange

KW - spin crossover

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A Ferroelectric Iron(II) Spin Crossover Material

Abstract

Keywords

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