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All the residues of the title compound, (C2H5.5NO2)2[ReO4], are located in general crystallographic positions. The glycine molecules have usual conformations [Rodrigues Matos Beja et al. (2006). Acta Cryst. C62, o71–o72] with the H atom of the carboxylate group half-occupied, thus bearing a formal half-positive charge per molecule. The perrhenate anion has nearly ideal tetrahedral geometry. A large number of strong hydrogen bonds give rise to the overall three-dimensional network. A two-dimensional network, parallel to (100), is made up of strong O—H...O hydrogen bonds with a donor acceptor distance of 2.445 (2) Å. A large number of weaker O—H...O and N—H...O hydrogen bonds consolidates the structure into an overall three-dimensional network.