[Effect of water on guanine crystallization: absorption spectra in the infrared and ultraviolet range]

The effect of water vapour on sublimated films of guanine was studied by IR- and UV-spectroscopy. It manifests itself essentially in the high-frequency shift of non-plane deformation vibration bands of NH- and NH2-groups and the shift of some pi leads to pi-transitions to the long-wave region and others to the short-wave one. The spectral changes observed on damping are due to the catalyzed by water rapid transition of partially ordered aggregates of initial film into crystal anhydrous ones at room temperature.