A rather concise discussion

We have found the novel structure by which phenol complexes with the acetonitrile molecule. Such a structure has an absolutely different hydrogen bonding pattern, which certainly makes it less favourable on comparison with the conventional one attributed to the 7-type hydrogen bonding. A phenol-acetonitrile complex formation via tt hydrogen bonding between the OH group of phenol and the C=N bond should be ruled out affirmatively. 

However, we have shown that the novel bond formation between phenol and acetonitrile plays a role on increasing the concentration of the acetonitrile. By postulating its existence under conditions in which phenol interacts with two acetonitrile molecules, we were able to explain the experimental data that have seemed to be rather unclear during the last four decades. Moreover, we have predicted the existence of another structure formed from phenol and two molecules of acetonitrile, which is characterized by a significant downshift by 244 cm of the v(OH) stretching mode of phenol, never observed experimentally in phenol-acetonitrile complexes. We have suggested that it is likely to exist in the gas phase and non-polar solvents at lower temperatures and showed its fingerprints in order to facilitate its possible experimental detection. 

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