Acta Cryst. (2007). E63, m2260-m2261  [ doi:10.1107/S160053680703694X ]

Hexaaquacobalt(II) 3-ammonionaphthalene-1,5-disulfonate tetrahydrate

D. J. Genther, P. J. Squattrito, K. Kirschbaum and A. A. Pinkerton

Abstract: The title compound, [Co(H₂O)₆][H₃NC₁₀H₅(SO₃)₂]₂·4H₂O, is part of an isostructural family that includes the nickel(II) and zinc(II) analogues. The salts contain centrosymmetric hexaaquametal cations and protonated ammonionaphthalenedisulfonate anions arranged in alternating layers. The anions stack so that the charged groups face the cationic layers, maximizing electrostatic interactions. The non-coordinated water molecules are located in the cation layers. An extensive network of strong near-linear N-HO and O-HO hydrogen bonds involving the ammonio group, water molecules and sulfonate O atoms further anchors the packing. One of the uncoordinated water molecules is disordered over at least two sites (modelled over two positions with almost equal site occupancies).

Online 3 August 2007

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