节点文献
两种铜配位聚合物的晶体结构和量子化学计算(英文)
Two Copper Coordination Polymers:Crystal Structure and Quantum Chemistry Calculation
【摘要】 在水热条件下以4-硝基邻苯二甲酸(4-H2nph)/2,2’-联吡啶-4,4’-二甲酸(H2bda)为主要配体,3-(2-吡啶基)吡唑(HL)/1,4-双(咪唑基-1-基)丁烷(bib)为辅助配体制备了2种新的金属有机配位聚合物[Cu4(4-nph)(L)6]n(1)和{[Cu2(bda)2(bib)2(H2O)4]·4H2O}n(2)。通过元素分析、红外光谱、热重X射线单晶衍射和X射线粉末衍射对它们进行了表征。结果表明,配合物1属于单斜晶系,C2/c空间群。晶胞参数:a=1.956 16(8) nm,b=1.290 68(8) nm,c=2.160 34(12) nm,β=97.073(2)°,V=5.412 9(5) nm3,Z=4。配合物2属于三斜晶系,P1空间群。晶胞参数:a=0.962 22(15) nm,b=1.102 90(17) nm,c=1.404 3(2) nm,α=72.752(4)°,β=79.271(4)°,γ=67.065(3)°,V=1.306 6(4) nm3,Z=1。在配合物1中,羧基配体4-nph2-通过单齿模式桥联金属中心,形成一维结构。在配合物2中,柔性bib配体连接金属中心形成具有26元环的双核结构。此外,还用Gaussian16程序PBE0/LANL2DZ方法从配合物1的晶体结构中提取“分子片段”进行了量子化学计算。计算结果表明配位原子与铜(Ⅱ)离子之间存在着共价作用。
【Abstract】 Two new metal-organic coordination polymers [Cu4(4-nph)(L)6]n(1) and {[Cu2(bda)2(bib)2(H2O)4]·4H2O}n(2) were prepared under hydrothermal conditions by employing 4-nitrophthalic acid(4-H2nph)/2,2’-bipyridine-4,4’-dicarboxylic acid(H2bda) as the primary ligand and 3-(2-pyridyl)pyrazole(HL)/1,4-bis(imidazol-1-yl)-butane(bib)as the ancillary ligand. They were characterized by elemental analysis, infrared spectroscopy, thermogravimetry,X-ray single crystal diffractometer, and X-ray powder diffractometer. The results show that complex1belongs to monoclinic system, C2/c space group with cell parameters: a=1.956 16(8) nm, b=1.290 68(8) nm, c=2.160 34(12)nm, β=97.073(2)°, V=5.412 9(5) nm3, Z=4; and complex2crystallizes in triclinic system, P1 space group with cell parameters: a=0.962 22(15) nm, b=1.102 90(17) nm, c=1.404 3(2) nm, α=72.752(4)°, β=79.271(4)°, γ=67.065(3)°, V=1.306 6(4) nm3, Z=1. In complex1, the carboxyl ligand 4-nph2-bridges the metal centers via monodentate modes.The metal centers are coordinated by 4-nph2-to form a 1D structure. In complex2, the flexible bib linked metal centers to form a dinuclear structure with a 26-member ring. In addition, the quantum-chemical calculations were accomplished on“molecular fragments”extracted from the crystal structure of 1 using the PBE0/LANL2DZ method in the Gaussian 16 program. The calculation values denoted the distinct covalent interaction between the coordinated atoms and Cu(Ⅱ) ion. CCDC: 2130919,1; 2097002,2.
【Key words】 coordination polymers; hydrothermal synthesis; crystal structure; quantum-chemical;
- 【文献出处】 无机化学学报 ,Chinese Journal of Inorganic Chemistry , 编辑部邮箱 ,2022年11期
- 【分类号】O641.4
- 【下载频次】36