期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 30, 页码 9426-9433出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b00103
关键词
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资金
- National Natural Science Foundation of China [21571113, 21771115]
- 973 program [2013CB933403]
- MEXT KAKENHI [17H01197]
- China Scholarship Council
Here, we use a pyridinecarbaldehyde rhodamine 6G hydrazone ligand (L) to synthesize an Fe(II) complex 1 for the search of new fluorescent-spin crossover (SCO) materials. Single-crystal structural determinations suggest that the Fe(II) ion is chelated by two ring-opened ligands (L-o) to form a FeN4O2 coordination environment, and intermolecular pi---pi contacts of the xanthene groups connect the adjacent molecules to form a supramolecular one-dimensional chain. Magnetic susceptibility measurements on complex 1 show that three-step SCO takes place in the temperature range of 120-350 K, and its desolvated form 1-d exhibits SCO around room temperature (T-c up arrow = 343 K and T-c down arrow = 303 K) with a wide hysteresis loop of 40 K. Moreover, complex 1-d displays light-induced excited spin-state trapping phenomenon. Intriguingly, the fluorescence intensity of the maximum emission at 560 nm for complex 1-d displays discontinuous variation in the range of 250-400 K, indicative of the occurrence of synergetic fluorescence and SCO.
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