Four novel Cu（Ⅰ） complexes,[Cu（o-PYO）（PPh3）2]BF4（1）,[Cu（o-PYO）（DPEphos）]BF4（2）,[Cu2 （o-PYO）（PPh3）3（CH3CN）]（BF4）2（3） and [Cu2（o-PYO）（DPEphos）2 ]（BF4）2（4） （o-PYO=2,5bis（pyridyl）-1,3,4-oxadiazole,PPh 3=triphenylphosphine,DPEphos=bis（2-（diphenylphosphanyl）phenyl）ether）,have been synthesized and characterized by 1 H NMR,elemental analysis and single-crystal X-ray diffraction.The central cuprous ions in all complexes are surrounded by N and P atoms to form a distorted tetrahedral geometry,although one of the cuprous ions in complex 3 is coordinated by a PPh3 and an acetonitrile molecule due to the steric hindrance and weak coordination ability from monodentate PPh3 ligand.The UV-vis absorption spectra in CH2Cl2 show the characteristic metal-to-ligand charge transfer （MLCT） absorption bands in the region of 360-480nm.Four Cu（I） complexes exhibit yellow to orange-red phosphorescence with the emission maximum at 572,577,562 and 597nm,respectively in the solid state.
