catena-Polytetra­aqua­praseo­dym­ium(III)-di-μ-nicotinato-κ2 O:N;κ2 O:N-disilver(I)-di-μ-nicotinato-κ2 N:O;κ2 N:O perchlorate monohydrate

摘要

In the title compound, {[Ag2Pr(C6H4NO2)4(H2O)4]ClO4·H2O}n, the Pr^III atom, lying on a twofold rotation axis, has a distorted square-anti­prismatic coordination geometry, defined by four O atoms from four nicotinate (nic) ligands and four water mol­ecules. The Ag^I atom is coordinated in an almost linear fashion by two pyridyl N atoms from two nicotinate ligands. The linear coordination is augmented by weak inter­actions with three O atoms from one perchlorate anion, one uncoordinated water mol­ecule and one carboxyl­ate group. Two Pr atoms link two {Ag(nic)2}⁺ units into a ring, which is further extended into an infinite zigzag chain by sharing the Pr atoms. These chains are further connected into a three-dimensional network via weak Ag⋯O inter­actions, O—H⋯O hydrogen bonds, Ag⋯Ag inter­actions [3.357 (2) Å] and π–π inter­actions between the pyridyl rings [centroid–centroid distance = 3.685 (4) Å].