Fluorescence emission modulation in cyanido-bridged Fe(II) spin crossover coordination polymers

Xue Ru Wu, Zhi Kun Liu, Min Zeng, Ming Xing Chen, Jun Tao, Shu Qi Wu, Hui Zhong Kou

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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]ClO4·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.[Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1569-1576
Number of pages8
JournalScience China Chemistry
Issue number8
Publication statusPublished - Aug 2022

All Science Journal Classification (ASJC) codes

  • General Chemistry


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