In connection with the possibility of spectroscopic study of equilibria, caused by the proton transfer in hydrogen bondI, of great interest are the amine-phenol systems. Increasing of the protonodonating power of the OH phenol group necessary for the proton transfer to occur could be obtained by introducing electronegative substituents into the ring. According to2,3the protonodonating power in the series of phenol chloroderivatives widely ranges, pentachlorophenol (PCP) being the most active donor of a proton in the series.