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

Abstract

Key indicators: single-crystal X-ray study; T = 140 K; mean (C-C) = 0.002 Å; Hatom completeness 89%; disorder in solvent or counterion; R factor = 0.035; wR factor = 0.098; data-to-parameter ratio = 23.4.The title compound, [Co(H 2 O) 6 ][H 3 NC 10 H 5 (SO 3 ) 2 ] 2 Á4H 2 O, 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-HÁ Á ÁO and O-HÁ Á ÁO 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).

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

“…Compound (I) is isostructural with its nickel(II) (Gunderman, Kabell et al, 1997) and cobalt(II) (Genther et al, 2007) analogues. For background, see: Chen et al (2002); ; Huo et al (2005).…”

“…Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2001); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and local programs. and cobalt(II) analogues (Genther et al, 2007). Compound (I) consists of centrosymmetic hexaaquazinc(II) cations, 3-ammonionaphthalene-1,5-disulfonate anions, and water molecules of crystallization ( Fig.…”