Near‐Room‐Temperature Magnetoelectric Coupling via Spin Crossover in an Iron(II) Complex. Issue 52 (23rd November 2022)

• Record Type: Journal Article
• Authors: Owczarek, Magdalena; Lee, Minseong; Liu, Shuanglong; Blake, Ella R.; Taylor, Chloe S.; Newman, Georgia A.; Eckert, James C.; Leal, Juan H.; Semelsberger, Troy A.; Cheng, Hai‐Ping; Nie, Wanyi; Zapf, Vivien S.
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 52(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-23
• Subjects: Magnetic Properties -- Magnetoelectric Coupling -- Molecular Magnet -- Spin Crossover -- Structural Phase Transition; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202214335
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Magnetoelectric coupling is achieved near room temperature in a spin crossover Fe II molecule‐based compound, [Fe(1bpp)2 ](BF4 )2 . Large atomic displacements resulting from Jahn–Teller distortions induce a change in the molecule dipole moment when switching between high‐spin and low‐spin states leading to a step‐wise change in the electric polarization and dielectric constant. For temperatures in the region of bistability, the changes in magnetic and electrical properties are induced with a remarkably low magnetic field of 3 T. This result represents a successful expansion of magnetoelectric spin crossovers towards ambient conditions. Moreover, the observed 0.3–0.4 mC m −2 changes in the H ‐induced electric polarization suggest that the high strength of the coupling obtained via this route is accessible not just at cryogenic temperatures but also near room temperature, a feature that is especially appealing in the light of practical applications. Abstract : Magnetoelectric coupling is achieved near room temperature in a spin crossover Fe II molecule‐based compound. The coupling is realized through the interplay of structural, magnetic, and electrical changes that allows the spin crossover to be driven by a remarkably low magnetic field of 3 T.