Fluorescence emission modulation in cyanido-bridged Fe(II) spin crossover coordination polymers
Fluorescence emission modulation in cyanido-bridged Fe(II) spin crossover coordination polymers
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DOI：
10.1007/s11426-022-1294-8
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hui-Zhong Kou
中科院分区：
文献类型：
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作者：
Xue-Ru Wu;Zhi-Kun Liu;Min Zeng;Ming-Xing Chen;Jun Tao;Shu-Qi Wu;Hui-Zhong Kou
Synergistic fluorescent spin crossover (SCO) bifunctional molecular materials have novel applications in the molecule-based magneto-optical switches. Herein, we report two novel three-dimensional (3D) Hofmann-type fluorescent SCO complexes [FeII-(tppe)MI(CN)2ClO4·nSolv (tppe = tetra-(4-pyridylphenyl)ethene, M = Ag (tppe-Ag), Au (tppe-Au)). Both complexes show one-step abrupt SCO with the transition temperature of 230 K for tppe-Ag, and 245 K for tppe-Au accompanied by a color change from red to light yellow. The SCO process is confirmed by the variable-temperature single-crystal X-ray diffraction analysis on tppe-Ag. For the first time, the abnormal increase in emission intensity and concomitant large bathochromic shifts in the fluorescence spectra during the SCO process are realized in the 3D Hofmann-type coordination polymers expanded by the tetradentate tppe ligand. Moreover, tppe-Ag exhibits the unprecedented fluorescence emission from green to the edge of yellow.
