title: Magnetic fluorescent bifunctional spin-crossover complexes.
abstract: The rational design of magnetic and fluorescent bifunctional materials is attracting increasing interest. In this study, two mononuclear Fe(ii) complexes, namely [Fe(L)2(NCS)2] (1) and [Fe(L)2(NCSe)2] (2) are synthesised by combining a spin-crossover unit and a fluorescent ligand (naphth-1-yl)-N-(3,5-di(pyridin-2-yl)-4H-1,2,4-triazol-4-yl)methanimine (L) to achieve bifunctionality. Single-crystal X-ray studies and magnetic measurements confirm the presence of spin crossover behaviours; these measurements agree with the results of the temperature depended Raman spectra and infrared spectra. Thermally and light-induced spin crossover is clearly observed for both complexes. The nature of the co-ligand (NCS-vs. NCSe-) shifts the transition temperature by approximately 60 K. The infrared spectra after irradiation reveal that the electronic states are ascribable to the photomagnetic effect at 10 K. Furthermore, temperature-dependent fluorescence emission spectra exhibit the coexistence of spin crossover and fluorescence for 1 and 2.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Jun-Li
authors.initials: JL
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Xiao-Jin
authors.initials: XJ
authors.lastname: Lv
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Rui-Lin
authors.initials: RL
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Chun-Ying
authors.initials: CY
authors.lastname: Duan
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Liu