title: catena-Poly[[[tetra-aqua-praseo-dym-ium(III)]-di-μ-nicotinato-κO:N;κO:N-disilver(I)-di-μ-nicotinato-κN:O;κN:O] perchlorate monohydrate].
abstract: In the title compound, {[Ag(2)Pr(C(6)H(4)NO(2))(4)(H(2)O)(4)]ClO(4)·H(2)O}(n), the Pr(III) atom, lying on a twofold rotation axis, has a distorted square-anti-prismatic coordination geometry, defined by four O atoms from four nicotinate (nic) ligands and four water mol-ecules. 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 inter-actions with three O atoms from one perchlorate anion, one uncoordinated water mol-ecule and one carboxyl-ate 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 inter-actions, O-H⋯O hydrogen bonds, Ag⋯Ag inter-actions [3.357 (2) Å] and π-π inter-actions between the pyridyl rings [centroid-centroid distance = 3.685 (4) Å].
authors.forename: Biao
authors.initials: B
authors.lastname: Guan
authors.forename: Chao-Hua
authors.initials: CH
authors.lastname: Zhang
authors.forename: Wen-Dong
authors.initials: WD
authors.lastname: Song