Spin-Crossover Behaviors of Iron(II) Complexes Bearing Halogen Ligands in Solid State and Solution

Ju Wang; Yun Li; Rong-Jia Wei; Zheng Tang; Zi-Shuo Yao; Jun Tao

doi:10.1021/acs.inorgchem.2c02815

Spin-Crossover Behaviors of Iron(II) Complexes Bearing Halogen Ligands in Solid State and Solution

Inorg Chem. 2023 Jan 30;62(4):1354-1361. doi: 10.1021/acs.inorgchem.2c02815. Epub 2023 Jan 12.

Authors

Ju Wang¹, Yun Li², Rong-Jia Wei³, Zheng Tang¹, Zi-Shuo Yao¹, Jun Tao¹

Affiliations

¹ Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, People's Republic of China.
² Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, People's Republic of China.
³ College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, People's Republic of China.

PMID: 36635894
DOI: 10.1021/acs.inorgchem.2c02815

Abstract

Numerous Fe(II) spin-crossover (SCO) compounds have been developed in the past decades, while the reports on the SCO materials with halogen atoms acting as coordinating ligands remain rare. In this study, we synthesize three iron(II) halide complexes with a general formula of [Fe^II(Py5Me₂)X]⁺ (Py5Me₂ = 2,6-bis[1,1-bis(2-pyridyl)ethyl]pyridine, X = Cl^- or Br^-) that undergo complete SCO transitions at near room temperature. The SCO properties of these compounds are investigated in detail by magnetic measurements, variable-temperature single-crystal X-ray diffractions, and Mössbauer spectra analyses. Because of the good stability of the coordination structures and suitable ligand-field strength, these compounds show robust spin transitions in both solid state and solution.