title: A grid-like two-dimensional Ag(I)coordination polymer: poly[[[mu3-N'-(4-cyanobenzylidene)isonicotinohydrazide]silver(I)] perchlorate].
abstract: This study presents new coordinating modes of a Schiff base with three coordinating groups and an interesting two-dimensional framework based on two types of constructing units. In the title compound, {[Ag(C(14)H(10)N(4)O)]ClO(4)}(n), the Ag(I) ion is coordinated by three N atoms and one O atom from three different N'-(4-cyanobenzylidene)isonicotinohydrazide (L) ligands, forming a primary distorted square-planar coordination geometry. Two ligands each bridge two metal centres through one carbonitrile N atom in a monodentate mode and the hydrazide N and O atoms in a bidentate mode to form a small centrosymmetric (2+2)-Ag(2)L(2) ring as a principal constructing unit. The pyridyl N atoms from four ligands in four of these small rings coordinate to Ag atoms in adjacent rings to form a large hexanuclear silver grid. A two-dimensional framework of rectangular grids is constructed from these small rings and large grids. Two perchlorate anions are located in each large grid and are bound to the grid by N-H...O hydrogen bonding. Crosslinking between the layers is achieved through long Ag...O interactions between the perchlorate anions and Ag atoms in adjacent layers.
authors.affiliation: College of Sciences, Henan Agricultural University, Zhengzhou 450002, People's Republic of China. niu_cy2000@yahoo.com.cn
authors.forename: Cao Yuan
authors.initials: CY
authors.lastname: Niu
authors.forename: Xian Fu
authors.initials: XF
authors.lastname: Zheng
authors.forename: Ling Ling
authors.initials: LL
authors.lastname: Bai
authors.forename: Xiao Ling
authors.initials: XL
authors.lastname: Wu
authors.forename: Chun Hong
authors.initials: CH
authors.lastname: Kou