Acta Cryst. (2009). E65, m208-m209  [ doi:10.1107/S1600536809001718 ]

catena-Poly[[[tetraaquapraseodymium(III)]-di--nicotinato-²O:N;²O:N-disilver(I)-di--nicotinato-²N:O;²N:O] perchlorate monohydrate]

B. Guan, C.-H. Zhang and W.-D. Song

Abstract: 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 AgO interactions, O-HO hydrogen bonds, AgAg interactions [3.357 (2) Å] and - interactions between the pyridyl rings [centroid-centroid distance = 3.685 (4) Å].

Online 17 January 2009

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