McMorran David A
Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Inorg Chem. 2008 Jan 21;47(2):592-601. doi: 10.1021/ic701919r. Epub 2007 Dec 8.
The new ligand 4-(3-(2-pyridyl)pyrazol-1-ylmethyl)benzoic acid (L) has been prepared and characterized. This bifunctional ligand incorporates both a chelating region, with two nitrogen donors, suitable for chelating to soft transition metal ions, and a self-complementary hydrogen-bonding region which can facilitate intermolecular association of ligands or ligand-based complexes. X-ray structural analysis of the ligand shows it to adopt a one-dimensional helical polymeric structure, with adjacent ligands hydrogen bonded to each other. Reaction of L with silver(I) salts (AgOTf (1, 1.1.5H(2)O), AgNO(3) (2), AgPF6 (3.CH(3)OH), and AgClO(4) (4.CH(3)OH)) results in the formation of complexes with 2:1 stoichiometries. X-ray structural analysis of these complexes shows that, in each case, one-dimensional chain structures are obtained where chiral AgL(2) tectons are hydrogen bonded together, either directly or mediated by anions or solvent. Structures with either helical or meso-helical structures are observed.
新型配体4-(3-(2-吡啶基)吡唑-1-基甲基)苯甲酸(L)已被制备并表征。这种双功能配体既包含一个螯合区域，有两个氮供体，适合与软过渡金属离子螯合，又有一个自互补氢键区域，可促进配体或基于配体的配合物的分子间缔合。配体的X射线结构分析表明它采用一维螺旋聚合物结构，相邻配体通过氢键相互连接。L与银(I)盐(AgOTf (1, 1.1.5H₂O)、AgNO₃ (2)、AgPF₆ (3·CH₃OH)和AgClO₄ (4·CH₃OH))反应生成化学计量比为2:1的配合物。这些配合物的X射线结构分析表明，在每种情况下，都得到一维链状结构，其中手性AgL₂结构单元通过阴离子或溶剂直接或间接通过氢键连接在一起。观察到具有螺旋或中螺旋结构的结构。
