ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract This is the first reported structure analysis of a cyclobutyl type photodimer obtained from the irradiation of thymine, uracil or its derivatives which contains water in the crystal lattice. Thecis-syn 6-methyluracil photodimer. H2O gives anomalous nmr and ir spectral data which may correlate with the crystal structure. The material crystallizes in space groupP21/a with unit cell parametersa = 15·58 Å,b = 11·33 Å,c = 7·28 Å and β = 107·2 °. Channels are formed in the crystal lattice which contain the H2O molecules. Each H2O molecule participates in hydrogen bonding to three different dimer molecules. The puckered cyclobutyl ring is significantly flatter than in the anhydrouscis-syn uracil photodimer and differences in the configurations of the uracil residues occur. The structure was solved by means of the symbolic addition procedure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01197794
