Yang Rui, Ma Jian Ping, Huang Ru Qi, Dong Yu Bin
College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Engineering Research Center of Pesticide and Medicine Intermediate Clean Production, Ministry of Education, Shandong Normal University, Jinan 250014, People's Republic of China.
Acta Crystallogr C. 2011 Jun;67(Pt 6):m176-80. doi: 10.1107/S0108270111016246. Epub 2011 May 13.
A new 1,3,4-oxadiazole bridging bent organic ligand, 2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole, C(28)H(24)N(4)O(3), L, has been used to create three novel one-dimensional isomorphic coordination polymers, viz. catena-poly[[[dichloridomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgCl(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n), catena-poly[[[dibromidomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgBr(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n), and catena-poly[[[diiodidomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgI(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n). The free L ligand itself adopts a cis conformation, with the two terminal pyridine rings and the central oxadiazole ring almost coplanar [dihedral angles = 5.994 (7) and 9.560 (6)°]. In the Hg(II) complexes, however, one of the flexible pyridylmethyl arms of ligand L is markedly bent and helical chains are obtained. The Hg(II) atom lies in a distorted tetrahedral geometry defined by two pyridine N-atom donors from two L ligands and two halide ligands. The helical chains stack together via interchain π-π interactions that expand the dimensionality of the structure from one to two. The methanol solvent molecules link to the complex polymers through O-H···N and O-H···O hydrogen bonds.
一种新型的1,3,4 - 恶二唑桥连弯曲有机配体，2,5 - 双{5 - 甲基 - 2 - [(4 - 吡啶基)甲氧基]苯基}-1,3,4 - 恶二唑，C(28)H(24)N(4)O(3)，L，已被用于制备三种新型的一维同构配位聚合物，即链状聚[[[二氯汞(II)] - μ - 2,5 - 双{5 - 甲基 - 2 - [(4 - 吡啶基)甲氧基]苯基}-1,3,4 - 恶二唑]甲醇单溶剂合物]，{[HgCl(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n)，链状聚[[[二溴汞(II)] - μ - 2,5 - 双{5 - 甲基 - 2 - [(4 - 吡啶基)甲氧基]苯基}-1,3,4 - 恶二唑]甲醇单溶剂合物]，{[HgBr(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n)，以及链状聚[[[二碘汞(II)] - μ - 2,5 - 双{5 - 甲基 - 2 - [(4 - 吡啶基)甲氧基]苯基}-1,3,4 - 恶二唑]甲醇单溶剂合物]，{[HgI(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n)。游离的L配体本身呈顺式构象，两个末端吡啶环和中心恶二唑环几乎共面[二面角 = 5.994 (7)和9.560 (6)°]。然而，在Hg(II)配合物中，配体L的一个柔性吡啶甲基臂明显弯曲，从而形成螺旋链。Hg(II)原子位于由来自两个L配体的两个吡啶N原子供体和两个卤化物配体所定义的扭曲四面体几何构型中。螺旋链通过链间π - π相互作用堆叠在一起，使结构的维度从一维扩展到二维。甲醇溶剂分子通过O - H···N和O - H···O氢键与复合聚合物相连。
