Browsing by Author "Nikolova R.P."

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    (R)-Methyl {[(2-carb-oxy-bicyclo-[2.2.2]octan-1-yl)-ammonio]-methyl}-phos- phon-ate dichloro-methane 0.25-solvate
    (2011-08-01) Todorov P.; Calmes M.; Shivachev B.L.; Nikolova R.P.
    The carb-oxy-lic acid mol-ecule of the title compound, C 11H 20NO 5P·0.25CH 2Cl 2, exists as a zwitterion with the H atom of the phospho-nate group being transferred to the imine N atom. In the asymmetric unit, there are two crystallographically independent acid molecules adopting the same absolute configuration and differing slightly in their geometrical parameters. In each mol-ecule, the imino and carboxyl groups are connected via an intra-molecular N - H⋯O hydrogen bond. Inter-molecular O - H⋯O and N - H⋯O hydrogen bonds induce the formation of layers parallel to the ab plane. The dichloro-methane solvent mol-ecule, with a site occupancy of 0.5, is located between the layers.