Acta Cryst. (2005). E61, m1849-m1851  [ doi:10.1107/S1600536805026309 ]

Hexaaquazinc(II) bis[trichloro(3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione-N⁹)zincate(II)] dihydrate

Z.-M. Jin, L. Li, M.-L. Hu, H. Su and C.-X. Tong

Abstract: The title compound, [Zn(H₂O)₆][ZnCl₃(C₈H₁₀N₄O₂)]₂·2H₂O, consists of two disordered water molecules, one hexahydrated Zn^II cation and two [Zn^IICl₃(caffeine)]^- anions, which are arranged around an inversion center. The coordination around the hexahydrated Zn^II cation is octahedral. This cation is linked with [Zn^IICl₃(caffeine)]^- anions and water molecules via O-HO hydrogen bonds. Moreover, O-HO and O-HCl hydrogen bonds are co-operative in building up two-dimensional bilayers in which hexahydrated Zn^II cations are sandwiched between two layers of [Zn^IICl₃(caffeine)]^- anions, which are anti-parallel to each other.

Online 27 August 2005

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