一种双核磷光环金属铂(Ⅱ)配合物的合成、结构及光谱性质

Synthesis,Structure and Electronic Spectra of a New Dinuclear Cyclometallated Platinum(Ⅱ) Complex

以6-(4-甲基磷酸二乙酯苯基)-2,2′-二联吡啶(HL)与K2PtCl4、二(二苯基磷)甲烷(dppm)及Ag(CF3SO3)反应,得到了一种双核Pt(Ⅱ)配合物[Pt2L2(μ-dppm)](CF3SO3)Cl.CH3CN。晶体结构表明,中心金属离子Pt(II)呈扭曲平面正方形构型,桥配体dppm连接两个金属中心,3.175的Pt——Pt距离表明双核配合物中存在金属-金属相互作用。该配合物在420nm及480nm(sh)低能吸收可归属为dz2(金属中心Pt(II))→π*(配体L)的MLCT跃迁。同时目标配合物在固体及乙腈溶液中均观测可归属为金属和金属相互作用到配体的电荷转移(3MMLCT)磷光发射,发射峰分别处于624及647nm。

A new dinuclear cyclometallated platinum（Ⅱ） complex,[Pt2L2（μ-dppm）] （CF3SO3）Cl·CH3CN,where HL is 6-（4-diethylmethylphosphonatephenyl）-2,2＇-bipyridine,and dppm is bis（diphenylphosphino）methane,has been synthesized and characterized.In this complex,each platinum（II） center adopts distorted square planar coordination geometry and bridged by biphosphine ligand dppm.The distance of the two platinum（II） centers is 3.175 ,which indicate that the complex has metal-metal interaction.The complex has low-lying absorption spectra located at 420 and 480 nm （sh）,which are assigned to metal to ligand charge-transfer transition （MLCT）.In addition,it displays metal-metal to ligand-charge-transfer （MMLCT） triplet state emission in solution or solid state,with peaks at 624 and 647 nm,respectively.