一个由咪唑衍生物构筑的二重穿插的锌配位聚合物的合成、结构及荧光性质

以ZnCl2、H3IDC(咪唑-4,5-二羧酸)和bix(1,4-双(咪唑基-1-甲基)-苯)为原料,在水热条件下得到了1个新的二重穿插的三维层-柱状金属-有机框架结构的配位聚合物{Zn3(IDC)(bix)1.5Cl3].0.25H2O}n(1),并通过元素分析、红外光谱、热重分析以及单晶X-射线结构分析对其组成和结构进行了表征。单晶X-射线结构分析表明,配合物1的晶体属于单斜晶系,P21/c空间群,a=1.158 44(17)nm,b=1.088 75(16)nm,c=2.391 7(3)nm,β=96.835(2)°,V=2.995 1(8)nm3,Z=4,Dc=1.813 g.cm-3,F(000)=1 638,对于4 772个可观测点(I>2σ(I)),最终残差因子R1=0.037 9,wR2=0.089 6。在配合物1中,每个IDC3-分别桥联4个锌(Ⅱ)离子形成一维锯齿形链状结构,一维链通过cis-μ2-bix的2个氮原子连接形成二维网状结构,相邻的二维层之间再通过trans-μ2-bix的2个氮原子进一步连接形成了二重穿插的三维层-柱状金属-有机框架结构。固体室温荧光测试结果表明,配合物1在波长为400 nm的光激发下于468 nm处出现强烈的荧光发射。

Synthesis, Structure, and Luminescent Property of a Two-Fold Interpenetrating 3D Zn(Ⅱ) Coordination Polymer Constructed from Imidazole Derivatives

Reaction of imidazole-4,5-dicarboxylic acid(H3IDC),1,4-bis(imidazole-1-ylmethyl)benzene(bix) with ZnCl2 under hydrothermal condition,yielded a coordination polymer of {Zn3(IDC)(bix)1.5Cl3]·0.25H2O}n(1) with two-fold interpenetrating 3D layered-pillared metal-organic framework architecture,which was structurally characterized by elemental analysis,infrared spectroscopy,thermal gravimetric analysis,and single-crystal X-ray diffraction.X-ray diffraction crystal structural analysis reveals its crystallizes in monoclinic system,space group P21/c with a=1.158 44(17) nm,b=1.088 75(16) nm,c=2.391 7(3) nm,β=96.835(2)°,V=2.995 1(8) nm3,Z=4,Dc=1.813 g·cm-3,F(000)=1 638,the final R1=0.037 9,and wR2=0.089 6 for 4 772 observed reflections with I>2σ(I).In complex 1,the interconnection of Zn,ions by chelating and bridging μ4-IDC3-anions result in a 1D zigzag chain structure of Zn3(μ4-IDC)Cl3]n.These adjacent 1D zigzag chains are further linked by cis-μ2-bix ligands to form a 2D network structure of Zn3(IDC)(cis-μ2-bix)Cl3]n,which are further pillared by trans-μ2-bix ligands to generate a two-fold interpenetrating 3D layered-pillared framework of Zn3(μ4-IDC)(cis-μ2-bix)(trans-μ2-bix)0.5Cl3]n.Furthermore,the luminescent property of complex 1 was also investigated at room temperature in the solid state.