Add time:08/11/2019         Source:sciencedirect.com

The Fourier-transform Raman (FT-Raman), infrared (FT-IR), and UV-visible absorption spectra of four dipyrrinones and two mesobilirubins have been investigated in the solid state and in CH2Cl2 solutions. A detailed spectral analysis, assignment and discussion of these spectra are presented. The bands at 1735–1738, 1691–1707 and 1359–1377 cm−1 which were assigned to the stretching vibrations of the COC and COH and symmetric deformation of CH bonds, respectively, can act as a marker to distinguish the compounds of this class. The striking differences between the spectra of the compounds suggest that mesobilirubin XIIIα is tending to adopt as ridge-tile conformation, rather than linear conformation.

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