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论文类型：期刊论文

发表时间：2014-02-01

发表刊物：EUROPEAN JOURNAL OF INORGANIC CHEMISTRY

收录刊物：SCIE、Scopus

卷号：2014

期号：6

页面范围：986-993

ISSN号：1434-1948

关键字：Thermochromism; Mechanochromism; Platinum; Luminescence; Density functional calculations

摘要：The square-planar diimine platinum(II) complex Pt(BpyCCSiMe(3))(CCC6H5)(2) (1, BpyCCSiMe(3) = 4-[(2-trimethylsilyl)ethynyl]-2,2-bipyridine) was prepared and characterized. In the solid state, 1 shows unusual reversible thermochromic and mechanochromic properties. When crystalline 1<bold>2</bold>(CHCl3) is heated or ground, the bright yellow emission centered at ca. 544 (576, sh) nm changes to 722 nm, which corresponds to a thermo- and mechanochromic response redshift of ca. 146-178 nm. Once the heated or ground samples were exposed to organic vapors, they reverted to the original crystalline state, and the luminescence changed from red to yellow. The conversion between a triplet metal-to-ligand charge transfer/ligand-to-ligand charge transfer ((MLCT)-M-3/(LLCT)-L-3) emission state and a triplet metal-metal-to-ligand charge transfer ((MMLCT)-M-3) state is the reason for the luminescence change.