ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Crystals of 4,2′-anhydro-5-(β-D-arabinofuranosyl)uracil, (I), obtained from an aqueous solution, were characterized as the dihydrate, C9H10N2O5·2H2O, (Ia). In air, these crystals slowly transform to the monohydrate, C9H10N2O5·H2O, (Ib), but remain crystalline. The solid-state transformation proceeds with the loss of one water molecule and a rearrangement of hydrogen-bonded layers of molecules. The furanose ring in (I) has an approximate C4′-exo,O4′-endo twist conformation. The central five-membered ring is slightly puckered. The uracil group is planar within experimental uncertainty.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100007794
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