Pentachlorophenol, hydrogen-bond complexation

The simplest aromatic alcohol, phenol, has not been investigated by INS although the chloro derivative pentachlorophenol [53] has been studied. The molecule forms a number of unusually strongly hydrogen bonded complexes with substituted pyridines and this is undoubtedly the first step in the investigation of these complexes. 

An interesting case of polymorphism has been reported by Harbison and coworkers for the complex of pentachlorophenol with 4-methylpyridine (4MPPCP) [44]. The substitution of hydrogen with deuterium at the hydrogen-bonded position leads to an entirely different crystal polymorph (Fig. 3.2.17). In particular the... 

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