两例相同混合配体构筑的Pb(Ⅱ)/Ag(Ⅰ)配位聚合物及其荧光性质

Two Pb(Ⅱ)/Ag(Ⅰ) Coordination Polymers Constructed by the Same Mixed Ligand and Their Fluorescence Properties

多齿配体2-咪唑乙酸(Hima)、4,4’-连吡啶分别与金属盐Pb(NO_(3))_(2)和AgNO_(3)反应,得到[Pb 2(4,4’-bipy)(ima)(NO_(3))_(3)]n(1,3D framework)和[Ag_(4)(4,4’-bipy)3(ima)2(NO_(3))_(2)(H_(2)O)_(2)]n(2,3D framework)两个配位聚合物。根据配位聚合物的结构特点,研究了这两个配位聚合物荧光性质等物理化学性能。配位聚合物1在最大激发波长(λex=346 nm)激发下,荧光的最大发射波长为552 nm,配位聚合物2在最大激发波长(λex=369 nm)激发下,荧光的最大发射波长为444 nm。这可能是由于金属和配体之间发生了电荷转移(LMCT)。

The 2-(1H-imidazol-1-yl)acetic acid(Hima),4,4’-bpy,reacts with metal ions Pb(NO_(3))_(2) and AgNO_(3) respectively.Finally,[Pb_(2)(4,4’-bipy)(ima)(NO_(3))_(3)]n(1,3D framework)and[Ag_(4)(4,4’-bipy)3(ima)2(NO_(3))_(2)(H_(2)O)_(2)]n(2,3D framework)coordination polymers were obtained.Based on the structural characterizations of the corresponding compounds,their chemical and physical properties,such as photoluminescence was investigated.The solid-state photoluminescence spectra of 1 and 2 at room temperature are observed to have their main emission at 552 nm and 444 nm(λex=346 nm for 1,369 nm for 2),respectively,which is mainly assigned to the ligand-metal charge transfer(LMCT).