Effect of orientational diffusion on the formation of H-bonded phenol complexes in an argon matrix

The concentration dependence of IR spectra of phenol and diphenols in an argon matrix at T = 12 K is studied as well as the effect of sample annealing at a temperature 25–30 K on the band intensity of isolated molecules and H-bonded homoassociates. The influence of diffusion on the formation of complexes is studied and a simple quantitative model is constructed that makes it possible to determine the fraction of H-bonded complexes of different compositions in the sample for different concentrations of molecules having a high orientational mobility in the matrix. It is shown that dimers predominate among the H-bonded complexes of these molecules for matrix dilutions down to 1:100 on account of a strong dependence of the orientational mobility of complexes on their size. Integral extinctions of the valence vibration bands of free and H-bonded OH-groups of phenols in the Ar matrix are calculated.

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