6145-31-9Relevant articles and documents
Ethane-1,2-diphosphonic acid as a building block in supramolecular chemistry; a pillared-layer framework and framework-encapsulated cations
Wheatley, Paul S.,Lough, Alan J.,Ferguson, George,Burchell, Colin J.,Glidewell, Christopher
, p. 95 - 102 (2001)
The 1:1 adduct of piperazine and ethane-1,2-diphosphonic acid is a salt [C4H12N2]2+ ·[C2H6O6P2]2-, in which both ions lie across centres of inversion in space group P21/c. The anions are linked by a single type of O - H...O hydrogen bond [O...O, 2.562 (3) A; H...O, 1.73 A, O - H...O, 169°] into (6, 3) nets built from a single type of R44(22) ring. The cations lie between these nets, linked to them by two types of N - H...O hydrogen bond [N...O, 2.635 (3) and 2.735 (3) A; H...O 1.72 and 1.82 A. N - H...O, 175 and 177°] such that the cations link adjacent sheets, thus forming a pillared-layer framework. The aquated adduct formed between trimethylenedipiperidine and ethane-1,2-diphosphonic acid is also a salt [C13H28N2]2+·[C 2H6O6P2] 2-·2.8[H2O], in which there are 12 different types of hydrogen bond, eight O - H...O and four N - H...O. The anions are linked into chains by pairs of O -H...O hydrogen bonds and these chains are linked by the water molecules into a continuous three-dimensional framework. Within the anion/water framework are large voids which contain pairs of cations, linked to the framework by N - H...O hydrogen bonds.
Process for preparing ethylenediphosphonic acids
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, (2008/06/13)
The invention relates to a process for preparing ethylenediphosphonic acids of the formula I, 1where R1 and R2 may be identical or different and are hydrogen, a carboxy group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having from 1 to 10 carbon atoms, phenyl, benzyl, or alkyl-substituted aromatic systems, which comprises reacting phosphorous acid (H3PO3) directly with alkynes.
