含联苯三羧酸及二咪唑基吡啶配体的两个锌配位聚合物的合成、结构及荧光性质

Synthesis, Structure and Luminescent Properties of Two Zinc Coordination Polymers Based on Biphenyl-3,3′,5-tricarboxylic and 2,6-Bis(imidazole-1-yl)pyridine Ligands

以3,3′,5-联苯三羧酸(biphenyl-3,3′,5-tricarboxylic acid,H3bpta)、2,6-二(1-咪唑基)吡啶(2,6-bis(imidazole-1-yl)pyridine,bip)、Zn(NO3)2·6H2O和ZnCl2为原料,在水热条件下合成了配位聚合物{[Zn3(H2O)7(bpta)2]·5H2O}n(1)和{[Zn2Cl(bpta)(bip)2]·2H2O}n(2)。并利用红外、元素分析和X-射线单晶衍射等对其结构进行表征。X-射线单晶衍射分析表明:化合物1属于单斜晶系,C2/c空间群,a=3.317 1(11)nm,b=1.495 7(5)nm,c=0.695 1(2)nm,β=91.50°,Z=4;化合物2属于单斜晶系,P2/c空间群,a=1.960 4(4)nm,b=1.035 7(2)nm,c=1.998 7(4)nm,β=101.97(3)°,Z=4。化合物1通过bpta桥联Zn髤形成1D链,通过配位水与羧基氧之间的氢键作用构筑成3D结构。化合物2中bip桥联Zn髤构成1D螺旋链状结构,进一步通过bpta桥连形成2D网状结构。此外,对化合物1和2进行了热稳定性分析和荧光性质研究。

Two coordination polymers, {[Zn3（H2O）7（bpta）2]·5H2O}n （1） （H3bpta=biphenyl-3,3＇,5-tricarboxylic acid） and {[Zn2Cl（bpta）（bip）2]·2H2O}n （2） [bip=2,6-bis（imidazole-1-yl）pyridine], have been synthesized under hydrothermal conditions and characterized by elemental analysis, FT-IR and single crystal X-ray diffraction. Complex 1 crystallizes in monoclinic system, space group C2/c with a=3.317 1（11） nm, b=1.495 7（5） nm, c=0.695 1（2） nm, β=91.50°, Z=4. Complex 2 crystallizes in monoclinic, space group P2/c with a=1.960 4（4） nm, b=1.035 7（2） nm, c=1.998 7（4） nm, β=101.97（3）°, Z=4. For 1, Zn（Ⅱ） bridged by bpta ligands to form a 1D chain, through the hydrogen bonding interaction between water molecules and carboxylate oxygen atoms, further extend 1D chains into a 3D structure. For 2, Zn（Ⅱ） were linked by bip ligands to form a 1D helical chain, and 1D chains further connected by bpta ligands to form 2D network. In addition, TG and luminescent properties of two complexes have also been investigated.CCDC： 929651, 1; CCDC： 929652, 2.