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摘要
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)2]Cl O4·n Solv(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.
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