Acta Crystallographica Section B

Structural Science

Volume 63, Part 3 (June 2007)

research papers

Acta Cryst. (2007). B63, 448-458 [ doi:10.1107/S0108768107005332 ]

Tautomerism and hydrogen bonding in guaninium phosphite and guaninium phosphate salts

E.-E. Bendeif, S. Dahaoui, N. Benali-Cherif and C. Lecomte

Abstract: The crystal structures of three similar guaninium salts, guaninium monohydrogenphosphite monohydrate, C₅H₆N₅O⁺·H₂O₃P^-·H₂O, guaninium monohydrogenphosphite dihydrate, C₅H₆N₅O⁺·H₂O₃P^-·2H₂O, and guaninium dihydrogenmonophosphate monohydrate, C₅H₆N₅O⁺·H₂O₄P^-·H₂O, are described and compared. The crystal structures have been determined from accurate single-crystal X-ray data sets collected at 100 (2) K. The two phosphite salts are monoclinic, space group P2₁/c, with different packing and the monophosphate salt is also monoclinic, space group P2₁/n. An investigation of the hydrogen-bond network in these guaninium salts reveals the existence of two ketoamine tautomers, the N9H form and an N7H form.

Keywords: nucleic acid bases; tautomerism; hydrogen bonding.


	Portable Document Format (PDF) file (159.8 kbytes) [ doi:10.1107/S0108768107005332/lb5008sup5.pdf ] Variation of imidazolyl and pyrimidine ring geometries

Notes:

To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.

The download button will force most browsers to prompt for a file name to store the data on your hard disk.

Where possible, images are represented by thumbnails.

Search: From to Advanced search