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A series of hydrogen bonded complexes of pentachlorophenol with various N bases, covering a wide range of ApK, values, was investigated using j5Cl n.q.r. The average frequencies of 35C1 n.q.r. of these complexes were compared with those of pentachlorophenol, tetrabutylammonium pentachlorophenolate and tetrabutylammonium bis-pentachlorophenolate. The changes of average frequencies as a function of ApK, are very similar to the dipole moment changes with hydrogen bond formation as a function of ApKa, but in solids the range of inversion is shifted to lower ApK, values. The region in which the dielectric and spectroscopic anomalies are observed may be formally attributed to the existence of the proton transfer equilibrium.

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