Acta Cryst. (2003). B59, 248-262 [doi:10.1107/S0108768102021237]
Abstract: The structures of seven salts formed by phosphonopropionic acid with organic diamines are reported; in these salts, the hydrogen-bonded substructures formed by the anions can be zero-, one- or two-dimensional, while the overall hydrogen-bonded supramolecular structures are three-dimensional. The 1:1 adduct, compound (1), formed between 1,2-bis(4'-pyridyl)ethene and phosphonopropionic acid is a salt, [{(C12H10N2)H2}2+]·[(C12H10N2)]·[(C3H6O5P)-]2, in which both diamine components lie across centres of inversion in space group P21/c. The anions form hydrogen-bonded head-to-head dimers, and these are linked by the two diamine units into sheets, which are themselves linked by C-H
O hydrogen bonds. With 2,2'-dipyridylamine the acid forms the hydrated salt [{(C10H9N3)H}+]·[(C3H6O5P)-]·H2O (2), in which all components are disordered with occupancy 0.5 in space group Fmm2. The anions form head-to-tail dimers, which are linked into sheets by the cations, and the sheets are linked into a three-dimensional framework by the water molecules. The piperazine salt [{(C4H10N2)H2}2+]·[(C3H5O5P)2-] (3) contains simple anion chains linked into a three-dimensional framework by the two independent cations, both of which are centrosymmetric. In the hydrated salt formed by N,N'-dimethylpiperazine, [{(MeNC4H8NMe)H2}2+]·[(C3H6O5P)-]2·(H2O)2 (4), head-to-tail anion chains combine with the water molecules to form a three-dimensional framework, which encloses voids that contain the cations. In the 4,4'-bipyridyl adduct [{(C10H8N2)H0.72}0.72+]·[{(H0.5O)3PCH2CH2COOH0.78}0.72-] (5), there is extensive disorder of the H atoms that are bonded to N and O atoms, and the anion chains are linked by the cations into sheets, which are themselves linked by C-HO hydrogen bonds. In the 1:2 adduct formed with 1,2-bis(4'-pyridyl)ethane, [{(C12H12N2)H2}2+]·[(C3H6O5P)-]2 (6), where the cation lies across an inversion centre, the anions form molecular ladders. These ladders are linked into sheets by the cations, which are themselves linked by C-HO hydrogen bonds. In the methanol-solvated salt formed with 2,6-dimethylpiperazine, [{(C6H14N2)H2}2+]·[(C3H6O5P)-]2· (CH4O)0.34 (7), the anions form sheets that are linked into a three-dimensional framework by the cations. The supramolecular structures are compared with those of analogous salts formed by phosphonoacetic acid.
Online 26 March 2003
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