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Monitoring the Spin States of Ferrous Ions by Fluorescence Spectroscopy in Spin‐Crossover–Fluorescent Hybrid Materials
Author(s) -
Wang ChunFeng,
Yang GuoYu,
Yao ZiShuo,
Tao Jun
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704901
Subject(s) - spin crossover , fluorescence , bifunctional , chemistry , förster resonance energy transfer , photochemistry , ion , spin states , spin (aerodynamics) , crystallography , physics , inorganic chemistry , optics , organic chemistry , thermodynamics , catalysis
The grafts of fluorophores 9‐anthraldehyde (AD) and 9‐phenanthrenecarboxaldehyde (PD), respectively, on the one‐dimensional spin‐crossover compound [Fe(L) 3 ](ClO 4 ) 2 (FeL, L=4‐amino‐1,2,4‐triazole) by post‐synthetic aldimine condensation reactions produced two spin‐crossover (SCO)–fluorescent hybrid materials, that is, FeL‐AD and FeL‐PD. The spin‐crossover critical temperatures of the two materials both centered at T c ↓=254 and T c ↑=256 K, whereas the fluorescence intensities of the two materials featured functions of the temperature that strictly synchronized with the spin‐crossover processes, which showed that the ligand‐centered fluorescence was dominated by the spin states of the ferrous ions. The bifunctional entities (spin‐crossover centers and fluorophores) in FeL‐AD or FeL‐PD showed spectral band overlap that purported the Förster resonance energy transfer mechanism of such spin‐crossover–fluorescence correlation. The post‐synthetic modification of SCO materials and the relationship between the fluorescence and the SCO may be helpful in the development of multifunctional materials that can be sensitive to multiple stimuli.