期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202103853
关键词
Spin-crossover; X-ray diffraction; Jahn-Teller distortion; thermal hysteresis; molecular devices
资金
- DFG [429784087, 278162697, CRC1242, CRC/TRR247, 388390466, SPP 1928]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [278162697-CRC 1242]
- Alexander von Humboldt (AvH) Foundation
- Projekt DEAL
This study investigates the structural facets of bistable spin-crossover complexes and their role in inducing hysteresis. Through single-crystal X-ray diffraction studies, it is found that molecular reorganizations and conformation switching contribute to the observed spin-state switching and hysteresis. These insights could potentially aid in the design of molecule-based switching and memory elements.
Bistable spin-crossover (SCO) complexes that undergo abrupt and hysteretic (Delta T-1/2) spin-state switching are desirable for molecule-based switching and memory applications. In this study, we report on structural facets governing hysteretic SCO in a set of iron(II)-2,6-bis(1H-pyrazol-1-yl)pyridine) (bpp) complexes - [Fe(bpp-COOEt)(2)](X)(2).CH3NO2 (X=ClO4, 1; X=BF4, 2). Stable spin-state switching - T-1/2=288 K; Delta T-1/2=62 K - is observed for 1, whereas 2 undergoes above-room-temperature lattice-solvent content-dependent SCO - T-1/2=331 K; Delta T-1/2=43 K. Variable-temperature single-crystal X-ray diffraction studies of the complexes revealed pronounced molecular reorganizations - from the Jahn-Teller-distorted HS state to the less distorted LS state - and conformation switching of the ethyl group of the COOEt substituent upon SCO. Consequently, we propose that the large structural reorganizations rendered SCO hysteretic in 1 and 2. Such insights shedding light on the molecular origin of thermal hysteresis might enable the design of technologically relevant molecule-based switching and memory elements.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据