Synthesis, Crystal Structure and Luminescence Property of [Ag_2(dppm)_2(NMP)_2](SbF_6)_2·4H_2O·3CH_2Cl_2

1 INTRODUCTION cited state by the intense spin-obital coupling of Ag?, and the energy gap between triplet excited state and The study of photoluminescent properties of d10 singlet ground state is very small, which causes lu- metal complexes has been receiving current atten- minescence quenching of Ag? complex[15, 16 ] . tion. A number of polynuclear complexes of Au, Ag, In this paper, we report the synthesis and struc- and Cu containing bridging phosphine ligands have tural characterizat…

Synthesis,Crystal Structure and Luminescence Property of [Ag_2(dppm)_2(NMP)_2](SbF_6)_2·4H_2O·3CH_2Cl_2

The silver-dppm complex, [Ag2(dppm)2(NMP)2](SbF6)2?4H2O?3CH2Cl2 1 (NMP = 2- (4-dimethylaminophenyl)imidazo(4,5-f)(1,10)phenanthroline, dppm = diphenylphosphinomethane), was synthesized and its structure was determined by X-ray diffraction. The crystal belongs to mono- clinic, space group C2/c, Mr = 2461.61, a = 21.57(10), b = 22.48(6), c = 22.53(6) ?, β = 101.29(2)o, V = 10713(64) ?3, Z = 4, Dc = 1.526 g/cm3, μ = 1.141 mm?1, F(000) = 4920, R = 0.0664 and wR = 0.1774 for 8524 observed reflections (I > 2σ(I)). Complex 1 exists as a centrosymmetric dimmer. The two dppm molecules bridge two AgNMP moieties to form an eight-membered Ag2P4C2 metal- lacyclic ring with ligand NMP chelating to each Ag. It appears photoluminescence (λmax = 625 nm) at room temperature and makes red shift compared with free ligand NMP (λmax = 522 nm). DFT calculation indicates that the emission of 1 originates from singlet metal-perturbed ILCT excited state.