期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 29, 页码 7222-7229出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02282d
关键词
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资金
- National Natural Science Foundation of China [91622120, 21601194, 21472196, 21521062]
- Ministry of Science and Technology of China [2012YQ120060]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB 12010400]
For the purpose of developing multicolor emissive molecular materials, a U-shaped diplatinum molecular switch 1 with an N, N-dimethylurea bridge was prepared. Three forms of single crystals of 1 with yellow (1A), orange (1B), or red (1C) emission were obtained. X-ray analysis shows that the two constituent [Pt(NCN)] units can have an open (1A and 1C) or closed (1B) conformation with different modes of crystal packing. In particular, intermolecular Pt-Pt interaction is evident for 1C with a short Pt-Pt distance of 3.226 angstrom. The interconversion among these crystals was triggered by external conditions, with the aid of an additional form of crystal 1D. The deep-red emissive crystal 1C exhibits excellent photophysical properties with lambda(max),(emi) of 650 nm, phi of 36%, and t of 846 ns. Spectroscopic analysis supports the hypothesis that compound 1 has a dominant open conformation in CHCl3 and a closed conformation in MeOH solution. The conformational switching and the degree of intermolecular interaction with tunable emission colors can be regulated by solvent composition.
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