title: Coordination-directed one-dimensional coordination polymers generated from a new oxadiazole bridging ligand and HgX2 (X=Cl, Br and I).
abstract: 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.
authors.affiliation: 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.
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Jian Ping
authors.initials: JP
authors.lastname: Ma
authors.forename: Ru Qi
authors.initials: RQ
authors.lastname: Huang
authors.forename: Yu Bin
authors.initials: YB
authors.lastname: Dong
mesh_terms: D001965:Bromides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007454:Iodides / Q000737:chemistry*; D008024:Ligands; D008627:Mercuric Chloride / Q000737:chemistry*; D017669:Mercury Compounds / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010069:Oxadiazoles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
chemical_list: C560115:2,5-bis(5-methyl-2-((4-pyridyl)methoxy)phenyl)-1,3,4-oxadiazole; D001965:Bromides; D007454:Iodides; D008024:Ligands; D017669:Mercury Compounds; D010069:Oxadiazoles; D011108:Polymers; D011725:Pyridines; D008627:Mercuric Chloride; C042720:mercuric bromide; C025718:mercuric iodide, red