The molecular structure of 5,6-dimethyluracil monohydrate C 6 H 8 N 2 O 2 H 2 O has been determined by X-ray diffraction method. The crystals are monoclinic space group P2 1 /n with a = 6.667 (2), b = 6.784 (4), c = 16.759 (2)Å, b = 99.08 (2)°, V = 748.6 (5)Å 3 and z = 4. The structure was refined to R = 0.064. The Raman and infrared spectra of the crystalline powders of the 5,6-dimethyluracil monohydrate, anhydrous and deuterated forms were investigated from 4000-200 cm −1 . An assignment of the normal modes is proposed. RÉSUMÉLa structure moléculaire du 5,6-diméthyluracile monohydrate C 6 H 8 N 2 O 2 H 2 O aété déterminée par diffraction des rayons X. Les cristaux appartiennent au groupe d'espace monoclinique P2 1 /n avec a = 6,667 (2), b = 6,784 (4), c = 16,759 (2)Å, b = 99, 08 (2), V = 748,6 (5)Å 3 et z = 4. La structure aété affinée jusqu'à un facteur R = 0,064. Les spectres Raman et infrarouge des poudres cristallines du 5,6-diméthyluracile monohydrate, anhydre et deutérié ontété analysés de 4000à 200 cm −1 . Une attribution de l'ensemble des vibrations fondamentales aété proposée.
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