Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 13, Pages 3218-3224Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201704901
Keywords
correlation; fluorescence; iron; post-synthesis; spin crossover
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Funding
- National Natural Science Foundation of China [21325103, 21671161, 21701014]
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The grafts of fluorophores 9-anthraldehyde ( AD) and 9-phenanthrenecarboxaldehyde ( PD), respectively, on the one-dimensional spin-crossover compound [ Fe(L)(3)](ClO4)(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 down arrow= 254 and T-c up arrow= 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 Forster 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.
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