Acta Cryst. (2001). B57, 95-102 [doi:10.1107/S0108768100014841]
Abstract: 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 [OO, 2.562 (3) Å; HO, 1.73 Å, O-HO, 169°] into (6, 3) nets built from a single type of 
ring. The cations lie between these nets, linked to them by two types of N-HO hydrogen bond [NO, 2.635 (3) and 2.735 (3) Å; HO 1.72 and 1.82 Å, N-HO, 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+·[C2H6O6P2]2-·2.8[H2O], in which there are 12 different types of hydrogen bond, eight O-HO and four N-HO. The anions are linked into chains by pairs of O-HO 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-HO hydrogen bonds.
Online 1 February 2001
 |   Structure factor file (CIF format) (69.1 kbytes) |
| Structure factor file (CIF format) (322.9 kbytes) |
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