Phase transition in crystalline pyrazine. Infrared and Raman spectra

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Abstract
The phase transition of crystalline pyrazine‐d0 and ‐d4 has been investigated by means of the infrared and Raman spectra at various temperatures. The spectra of the low temperature phase (form II) are consistent with x‐ray structure. Inferences on the unknown structure of the high temperature phase (form I) are given, and arguments in favor of an orthorhombic or monoclinic structure are discussed. The complex pattern of several bands is described and attributed to interaction with combination levels.

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