由氢键连接的三个金属-有机网状化合物的合成、结构及半导体性质

以2，4，6-三（1-吡唑基）-1，3，5-三嗪（TPTz）与不同金属离子进行溶剂热反应，得到了3个氢键连接的金属-有机网状化合物。实验发现TPTz的水解产物6-（1-吡唑基）-1，3，5-三嗪-2，4-二酚（H₂L）在反应中起到了实际的配位作用。单晶结构分析表明，它们是同构化合物，分子式为M（HL）₂]·2H₂O（M=Zn，1；Co，2；Mn，3）。每个中心金属原子分别与2个吡唑基上的N、2个吡嗪环上的N和2个水分子中的O形成六配位的结构。2个HL-与1个中心金属配位形成一个零维的金属-有机配合物小分子，这些小分子通过氢键连接进一步拓展为二维层状结构。紫外-可见漫反射（UV-Vis DRS）分析结果表明，这3种化合物都是宽系半导体材料，其带隙宽度分别为3.80（Zn），3.30（Co），3.27（Mn） eV，其半导体性质同中心金属原子表现出明显的相关性。

Three Hydrogen-Bonded Metal-Organic Networks with Tunable Semiconductor Properties

Solvothermal reacition of 2,4,6-tris(pyrezole-1-yl)-1,3,5-s-triazine (TPTz) and three metal ions resulted in the formation of three hydrogen-bonded metal-organic networks. It''s found that 6-(pyrezole-1-yl)-1,3,5-triazine-2,4-diol (H₂L) hydrolyzed from TPTz acts as the ligand in reality. Single-crystal structure analysis shows that the three compounds are isomorphous with the formula of M(HL)₂]·2H₂O (M=Zn, 1; Co, 2; Mn, 3). The center metal ion is six-coordinated by two N atoms from pyrazolyl, two N atoms from triazine ring and two O atoms from waters, respectively. Two HL^- coordinate to one center metal ion forming a zero-dimensional metal-organic molecular, which was linked by the hydrogen bond, and then extended to a two-dimensional layer network. UV-Vis DRS analysis shows that they are all wide band semiconductors with a band-gap of 3.80 (Zn), 3.30 (Co), 3.27 (Mn) eV, respectively, showing an obvious dependence on their center metal ions.