Dinuclear copper(I) complexes containing diimine and phosphine ligands: Synthesis, copper-copper separation and photophysical properties

作者：Chen, Yong; Chen, Ji-Shu; Gan, Xin; Fu, Wen-Fu^*

来源：Inorganica Chimica Acta, 2009, 362(7): 2492-2498.

DOI：10.1016/j.ica.2008.11.007

• Copper(I) complexes
• Cu-I center dot center dot center dot Cu-I distances
• Spectral properties

Dinuclear copper(I) complexes with bridging bis(dicyclohexylphosphino) methane (dcpm) or bis(diphenylphosphino) methane (dppm) and 2,2'-bipyridine or 2-[N-(2-pyridyl)methyl]amino-5,7-dimethyl-1,8-naphthyridine (L), [Cu-2(bpy)(2)(dppm)(2)](BF4)(2) (1), [Cu-2(bpy)(2)(dcpm)](BF4)(2) (2), [Cu-2(L)(dppm)](BF4)(2) (3) and [Cu-2(L)(dcpm)](BF4)(2) (4) were prepared, and their structures were determined by X-ray crystal analysis. Two-, three-, and four-coordinate copper(I) centers are found in these complexes. Compounds 3 and 4 show close Cu-I center dot center dot center dot Cu-I separations of 2.664(3) and 2.674(1) angstrom, respectively, whereas an intramolecular copper-copper distance of 3.038 angstrom is found in 2 having only dcpm as an additional bridge. Powdered samples of 1, 3, and 4 display intense and long-lived phosphorescence with lambda(max) at 533, 575, and 585 nm at room temperature, respectively. In the solid state, 2 exhibits only a weak emission at 555 nm. The time-resolved absorption and emission spectra of these complexes were investigated. The difference in the emission properties among complexes 1-4 suggests that both Cu-I center dot center dot center dot Cu-I distances and coordination environment of the copper(I) centers affect the excited-state properties.

• 出版日期2009-5-15
• 单位云南师范大学; 曲靖师范学院; 中国科学院理化技术研究所