2,3-吡嗪二酸锶配合物的合成及其晶体结构与荧光性能

Synthesis,Structure and Fluorescence Property of Strontium(Ⅱ) Complex with 2,3-Pyrazinedicarboxylic Acid

2,3-吡嗪二酸(H2pdc)和SrCO3反应合成了配合物[Sr(pdc)(H2O)2].H2O(1),其结构经IR,元素分析和X-射线单晶衍射表征。1属单斜晶系,空间群P21/n,晶胞参数a=10.520(10)(2),b=7.050(6),c=13.575(10),β=94.330(7)°,V=1 003.9(14)3,Z=4,Dc=2.036 g.cm-3,μ=5.395 mm-1,F(000)=608,R1=0.040 0,ωR2=0.102 7,S=1.069。1的不对称单元中含有一个Sr(Ⅱ)原子,Sr(Ⅱ)中心采取八配位的双帽三棱柱几何构型,配体H2pdc中的2个羧基采用不同的配位模式,其中1个羧基采取μ2-η2:η1-桥联配位模式,而另外1个采取μ2-η1:η1桥联配位模式,整个pdc2-作为μ4-桥联结4个不同的Sr(Ⅱ)原子形成(4,4)拓扑结构的二维网;二维网再由O-H┈O氢键进一步将二维层联结在一起形成三维结构。在355 nm激发波长激发下,1的最大发射峰在628 nm。

Strontium complex with 2,3-pyrazinedicarboxylic acid（H2pdc）,[Sr（pdc）（H2O）2]·H2O（1）,was synthesized by the reaction of H2pdc with SrCO3.The structure was confirmed by IR,elemental analysis and X-ray single crystal diffraction.1 belongs to monoclinic crystal system,space group P21/n with a=10.520（10）（2）,b=7.050（6）,c=13.575（10）,β=94.330（7）°,V=1 003.9（14）3,Z=4,Dc=2.036 g·cm-3,μ=5.395 mm-1,F（000）=608,S=1.069,R1=0.040 0,ωR2 =0.102 7.The asymmetric unit in 1 contains a independent Sr（Ⅱ） atom center.The Sr（Ⅱ） atom is eight-coordinated with a distorted bicapped trigonal prism geometry.Two carboxylate groups of pdc2-anion adopt different coordination modes.One carboxylate group adopts a μ2-η2：η1-bridging mode,while the other adopts a μ2-η1：η1-bridging coordination mode.The whole pdc2-anion acts as a μ4-bridge linking four Sr（Ⅱ） atoms generating a two-dimensional（4,4） topological network structure.The two-dimensional network structure are connected together to form three-dimensional structure by O-H┈O hydrogen bonding interactions.The maximum peak of 1 is at 628 nm under excitation wavelengths of 355 nm.