Synthesis and spectral investigations of pyridinium picrate

This article describes the vibrational spectra of a crystalline compound called “Pyridinium Picrate. The vibrational spectra measurements were recorded as a function of temperature by both FT-IR and Raman spectroscopy. The presence of various functional groups and modes of their vibrations were assigned and followed evolutions. The stability of the crystalline compound arising from has been analyzed using DSC analysis. This crystal composed of two symmetry groups C2v and P-1 respectively named phase I and II, this transition was followed by a function of temperature and XRD, is agreement with crystal structure data. In the present investigation, IR and Raman spectroscopy were employed for the identification of the transitions phase of this dimorphic. Essentially studied by Raman low frequency, the shift, disappearance and appearance of the peaks are used for the determination of the phase transition by the characteristic bands NO2, C-H deformation and C-O stretching, these results reveal a reversibility of this structural transition, depending on the operating conditions.