Title of Paper:Simultaneous Modulation of Magnetic and Dielectric Transition via Spin-Crossover Tuned Spin Arrangement and Charge Distribution.

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Date of Publication:2018-01-01

Journal:Angewandte Chemie (International ed. in English)

Included Journals:PubMed、SCIE

Volume:57

Issue:28

Page Number:8468-8472

ISSN No.:1521-3773

Key Words:coordination chemistry; iron; magnetic interactions; multifuntional materials; spin-crossover complexes

Abstract:It is formidable to simultaneously tune magnetic and dielectric properties by external stimuli with rapid and sensitive response, which is crucial to monitor magnetic state via capacitive measurement. Herein, positive charged FeII ions were linked via negative charged [FeIII(Tp)(CN)₃] (Tp = hydrotris(pyrazolyl)borate) units to form a neutral chain. The spin-crossover (SCO) on FeII sites could be sensitively triggered via thermal treatment, light irradiation, and pressure. SCO switched spin state of FeII ions and antiferromagnetic interactions between FeIII and FeII ions, resulting in significant change in magnetization. Moreover, SCO induced rotation of negative charged [FeIII(Tp)(CN)₃] units, generating dielectric anomaly due to geometric change of charges distribution. This work provides a rational way to manipulate simultaneous variations in magnetic and dielectric properties utilizing SCO as an actuator to tune spin arrangement, magnetic coupling, and charge distribution. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.