期刊
CHEMICAL PAPERS
卷 74, 期 11, 页码 3717-3725出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11696-020-01251-w
关键词
Copper(I); Cluster compounds; Crystal structure; Thermochromic dual emission; Near-infrared emission
资金
- JSPS KAKENHI [JP16H06514]
- University of Hyogo
Two new photoluminescent multinuclear Cu(I) cluster complexes supported by monoanionic bidentate ligandN-methylbenzimidazolethiolate (Me-bimt(-)), [Cu-n(Me-bimt)(n)] withn = 4 (1) and 6 (2), have been synthesized and structurally characterized by single-crystal X-ray diffraction analysis. For1and2, the Cu(I) ions and the Me-bimt(-)ligands construct a cubane-type {Cu4S4} and a hexagonal-prism {Cu6S6} frameworks, respectively. In the crystalline state, complexes1and2exhibit green (lambda(em) = 500 nm) and near-infrared (lambda(em) = 876 nm) emission, respectively, under UV irradiation (lambda(ex) = 365 nm) at room temperature. Both crystals reveal temperature-dependent dual emission below 200 K: complex1emits in the visible wavelength region (lambda(em) = 493 and 542 nm) and complex2in the visible to near-infrared wavelength region (lambda(em) = 752 and 973 nm) which are attributed to multiple photoexcited states at the cluster frameworks with distinct metal nuclearity.
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