Acta Cryst. (2009). E65, m1031-m1032  [ doi:10.1107/S1600536809030153 ]

4,4'-Diazenediyldipyridinium 4-(4-pyridyldiazenyl)pyridinium octacyanidotungstate(V) dihydrate

S.-Y. Qian, W.-Y. Liu and A.-H. Yuan

Abstract: The asymmetric unit of the title complex, (C₁₀H₁₀N₄)(C₁₀H₉N₄)[W(CN)₈]·2H₂O, contains two 4,4'-diazenediyldipyridinium, [H₂(4,4'-azpy)]²⁺, two 4-(4-pyridyldiazenyl)pyridinium, [H(4,4'-azpy)]⁺, cations, two [W^V(CN)₈]^3- anions, and four uncoordinated water molecules. Each of the W centers is coordinated by eight CN groups in a slightly distorted square-antiprismatic geometry. In the crystal structure, intra- and intermolecular N-HO, N-HN and O-HN hydrogen bonds link the cations and anions in an alternating fashion, forming a two-dimensional layered structure, in which they are further linked through the very weak - stacking interactions [shortest distance = 4.640 (2) Å] and van der Waals forces between adjacent layers, forming a three-dimensional supramolecular network.

Online 8 August 2009

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