Synthesis,Crystal Structure and Photoluminescence of a TADF Dinuclear Cu(Ⅰ) Complex

A binuclear Cu(Ⅰ) complexCu(PCNP)(mepypz)]_2(BF_4)_2 (1,PCNP=2,6-bis(diphenylphosphine)-benzonitrile,mepypz=2-methyl-6-(1H-pyrazol-3-yl)-pyridine was synthesized from the reaction of Cu(CH_3CN)_4BF_4,PCNP and mepypz in CH_2Cl_2 at room temperature.The compound was characterized by NMR,UV-vis and X-ray single-crystal structure analysis.It crystallizes in monoclinic space group P2_1/c with a=14.0139(5),b=11.8149(3),c=27.1248(10)?,β=96.686(4)°,V=4460.6(3)?~3,Z=2,M_r=1561.97,D_c=1.163 g/cm~3,F(000)=1600.0,μ=1.774 mm~(–1),GOOF=1.071,the final R=0.0523 and w R=0.1412 for 7919 observed reflections with I2σ(I).The Cu atoms in the complex are four-coordinated and adopt a distorted tetrahedral coordination geometry.In the solid state,the complex exhibits yellowish-green emission with a peak wavelength of 546 nm,a lifetime of 390μs,and a quantum yield of 0.45 at room temperature.The temperature-dependent investigation of luminescent properties suggests that the complex emits thermally activated delayed fluorescence (TADF) at room temperature.