Abstract
Freeze-drying crystals and mixed crystals were prepared from the frozen aqueous solutions of thymine (1) and of a mixture of 5-bromouracil (6a) and L-tryptophan (7). Their spectral and photochemical behaviors were compared to those of crystals and mixed crystals obtained by the evaporation of the aqueous solutions at room temperature. The freeze-drying thymine crystals underwent nonselective photodimerization to give a mixture of photodimers 2, 3 and 5, while the thymlne crystals obtained at room temperature showed no photoreactivity. The freeze-drying crystals from 6a and 7 were a simple mixture of component crystallites.
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