Temperature-dependent Raman and infrared spectra of nucleosides. Part I—adenosine

Raman and infrared spectra were recorded for crystalline adenosine samples at 300, 150 and 20 K. Data were taken over the entire spectral range from 20 to 3600 cm−1. The wavenumbers of most vibrational modes were found to increase with decrease in temperature, but those near 3000 cm−1 showed the opposite trend. A number of peaks split into multiplets at low temperature. No evidence was found of any structural phase transitions in this temperature range.