新型锶配位聚合物的合成和晶体结构

Synthesis and crystal structure of a strontium-based coordination polymer

用一种柔性三酸N,N′,N″-三(羧基甲基)-1,3,5-苯基三甲酰胺(H3TCMBT)与硝酸锶反应,得到了一个结构新颖的配位聚合物[Sr2(HTCMBT)2(H2O)7]n,并用元素分析、傅里叶变换红外光谱以及单晶X射线衍射对其进行了表征.该晶体属单斜晶系,Cc空间群,晶胞参数a=1.325 70(16)nm,b=2.374 9(3)nm,c=1.353 26(16)nm,α=γ=90.00°,β=104.781(2)°,V=4.119 7(9)nm3,Z=4,R1=0.043 2,wR2=0.109 6.配合物中的Sr(II)采取了单帽四方反棱柱的九配位构型和单帽八面体的七配位构型,并通过羧基氧的桥连形成二核簇;配体则以二聚体形式出现.以二核簇和二聚体为结点,晶体可简化为一种较为少见的单结点4-连接三维网络,其拓扑结构属于neb型,施莱夫利(Schlfli)符号为{66}.

A novel coordination polymer [Sr2 （HTCMBT）z （Hz 0）7 In was prepared by the reaction of a flexible tricarboxylic acid, N, N＇, N%tris （carboxymethyl）- 1,3,5-benzenetricarboxamide （ Ha TCMBT）, with stronti- umnitrate and characterized by using Fourier transform infrared spectroscopy, elemental analysis and single crystal X-ray diffraction. The crystal crystallized in the monoclinic system, space group Cc with unit cell parameters a=l. 325 70（16） nm, b--=2. 374 9（3） nm, c=l. 353 26（16） nm, a=）＇= 90.00~, fl= 104.781（2）~, V= 4. 119 7（9） nm3, Z=4, R1=0.043 2, wRz=0.109 6. In the complex, Sr（II） ions adopted 9-coordinated monocaped square antiprism and 7-coordinated monocaped octahedron geometry. Two types of Sr （If） ions were bridged by carboxylic oxygen atoms to form a dinuclear cluster and ligands were presented as dimer. Using the cluster and the dimer as a node, respectively, a rare three-dimensional uninacl^l a-r.nn,~o＊.A ,,,~h .~＊ ;~ ~..~：~ .._：.L t-_L,,, r,：