An AIE-Active Fe(II) Complex Exhibiting Synergistic Spin-Crossover and Luminescent Properties

作者：Jinjiang Wu, Qianqian Yang, Xiaolei Li, Zhenhua Zhu, Chen Zhao, Tao Liu, Jinkui Tang · 发表于：Crystal Growth & Design · 年份：2025 · DOI：10.1021/acs.cgd.4c01726 · 被引用次数：7 · 研究领域：Magnetism in coordination complexes、Lanthanide and Transition Metal Complexes、Luminescence and Fluorescent Materials

The investigation of the synergistic relationship between spin-crossover (SCO) and luminescence has recently become a field of intensive research. However, the weak emission intensity of these complexes presents a challenge for the study of luminescence properties in the aggregated state. In general, an aggregation-induced emission (AIE)-active ligand can be introduced to enhance luminescent intensities and fabricate SCO-fluorescent materials. Herein, a mononuclear complex [Fe(bpp-TPE) 2 ]·(ClO 4 ) 2 ·H 2 O·0.5CH 2 Cl 2 ( bpp-TPE-Fe ), where bpp-TPE = ( E )-1-(2,6-di(1H-pyrazol-1-yl)pyridin-4-yl)- N -(4-(1,2,2-triphenylvinyl)phenyl)methanimine, bearing an AIE-active fluorophore, was synthesized. This complex exhibits a gradual SCO behavior and strong luminescence in the aggregated state. Moreover, the SCO process covers the temperature range where a substantial increase in luminescence intensity occurs, implying a coupling between SCO and fluorescence. At the same time, the AIE behavior of bpp-TPE-Fe was investigated in a DCM/ n -hexane mixture. This work provides a promising strategy for the development of multifunctional switchable materials.