Research Article: Poly[penta­aqua­tetra­kis(μ2-nicotinato-κ2N:O)(perchlorato-κO)lanthanum(III)disilver(I)]

Date Published: August 01, 2009

Publisher: International Union of Crystallography

Author(s): Biao Guan, Chao-Hua Zhang, Wen-Dong Song.


In the title complex, [Ag2La(C6H4NO2)4(ClO4)(H2O)5]n, the LaIII atom, lying on a twofold rotation axis, is eight-coordinated by four O atoms from four nicotinate (nic) ligands and four water mol­ecules in a distorted square-anti­prismatic coordination geometry. The AgI atom is coordinated in an almost linear fashion by two pyridyl N atoms of two nic ligands. The linear coordination is augmented by weak inter­actions with one O atom from a half-occupied ClO4− anion and a water mol­ecule lying on a twofold axis. Two Ag(nic)2 units connect two La atoms, forming a cyclic unit. These units are further extended into an infinite zigzag chain. The chains are bridged by the disordered perchlorate ions via weak Ag—O [2.678 (2) Å] inter­actions. O—H⋯O hydrogen bonds, weak Ag⋯Ag [3.3340 (15) Å] inter­actions and π–π inter­actions between the pyridyl rings [centroid–centroid distance = 3.656 (2) Å] lead to a three-dimensional network.

Partial Text

For related structures see: Evans & Lin (2001 ▶); Luo et al. (2004 ▶).




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