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Crystal structure of bis-(9H-6-amino-purin-1-ium) hexa-fluorido-silicate(IV) dihydrate.

ABSTRACT: The asymmetric unit of the title compound, 2C5H6N5 (+)·SiF6 (2-)·2H2O, contains one adeninium cation, half of a hexa-fluorido-silicate anion located on an inversion centre and one lattice water mol-ecule. The adeninium cations are connected through N-H?N hydrogen bonds involving one H atom of the -NH2 group and the H atom of the protonated N atom of the adenine ring system, forming centrosymmetric ring motifs of the type R 2 (2)(10) and R 2 (2)(8), respectively. The overall connection of the cation leads to the formation of planar ribbons parallel to (122). In the ribbons, slipped ?-? stacking inter-actions, with a centroid-to-centroid distance of 3.6938?(9)?Å, an inter-planar distance of 3.455?Å and a slippage of 1.306?Å is observed. The hexa-fluorido-silicate anion and the water mol-ecule are linked through O-H?F hydrogen bonds [ring motif R 4 (4)(12)] into chains parallel to [100]. The cationic ribbons and anionic chains are finally connected through additional N-H?O, N-H?F and O-H?F hydrogen bonds into a three-dimensional network in which layers of adeninium cations and fluorido-silicate anions alternate parallel to (001).

SUBMITTER: Belhouas R

PROVIDER: S-EPMC4384624 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature

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