Abstract
Raman and infrared spectra of crystals obtained from an aqueous solution of piperazine and pinacol with an arbitrary molar ratio were observed and confirm the formation of a solid solution of (piperazine–pinacol) hexahydrate, for which the infrared and Raman bands due to piperazine molecules change as the molar fraction of piperazine, x, changes. The Raman spectra of the deuterated system with x=0.80 were also observed in the temperature range 296–25 K. One of two N–D stretches, the lower wavenumber one, increased in intensity as the temperature decreases and was assigned to polarons. It was found that the Raman intensity of the polarons is stronger in the solid solution than the parent compound, which can be qualitatively explained in terms of the difference in structure between them. © 1997 John Wiley & Sons, Ltd.
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