以1,2,5-噻二唑-3,4-二酸为配体的碱土金属配合物的合成、晶体结构及配位模式  

Study on Synthesis,Crystal Structure,and Coordination Model of 1,2,5-thiadiazole-3,4-dicarboxylicacid Ligand in Alkaline Earth Coordination Compounds

作　　者：马步伟[1] 赵振新[1,2] 王立夫[2] 

机构地区：[1]河南城建学院化学与材料工程学院,平顶山467036 [2]南开大学化学学院,天津300071

出　　处：《人工晶体学报》2014年第7期1856-1861,共6页Journal of Synthetic Crystals

基　　金：河南省科技攻关项目(122102210395);平顶山市重点科技攻关项目(2013066)

摘　　要：以1,2,5-噻二唑-3,4-二酸为单一配体与第二主族碱土金属离子通过水热法合成了三个配合物,对其进行了元素分析及单晶衍射结构解析,并对H2tdzdc配体的配位能力、配位模式等特性作了初步研究。结果表明:单核配合物1,[Mg(tdzdc)(H2O)4]属于三斜晶系,空间群为P1;配位聚合物2,[Ca(tdzdc)(H2O)2]n,具有二维层状结构,属于单斜晶系,空间群为C2/c;配位聚合物3,[Sr(tdzdc)(H2O)3]n,具有二维层状结构,属于三斜晶系,空间群为P1。通过研究发现,当使用IIB主族的碱土金属与1,2,5-噻二唑-3,4-二酸根进行配位时,随着金属离子半径的增加和电子层数的增多,金属离子的配位数增多,得到的Mg、Ca、Sr的配合物结构愈加复杂,即从单核配合物到配位聚合物。Three alkaline earth based coordination compounds have been successfully synthesized with 1,2,5-thiadiazole-3,4-dicarboxylic acid（H2tdzdc） ligand by the solvothermal reaction. Both complexes were characterized by single crystal X-ray diffraction, IR spectra and elemental analyses. The coordination modes and ability of H2 tdzdc were systematically discussed. Structure analysis reveals that mononuclear coordination compound 1 [Mg（tdzdc）（H2O）4]belongs to triclinic crystal system and space group of P1; coordination polymer 2 [Ca（tdzdc）（H2O）2]nwith 2-d layer structureand belongs to monoclinic system C2 /c space group; coordination polymer 3 [Sr（tdzdc）（H2O）3]nis also 2-D layer structure,but has triclinic crystal system P1 space group. It was found that with the increase of alkaline earth metal ion radius and the electron shell number,the coordination number of metal ions increase when the alkaline earth metal coordinate with H2 tdzdc ligand. Complexes structure of Mg,Ca,Sr is moreand more complicated,that is,changes from mononuclear compound to coordination polymer.

关 键 词：碱土金属 配位模式 晶体结构 

分 类 号：O614[理学—无机化学]