title: Fourier-transform Raman and infrared spectroscopic analysis of dipyrrinones and mesobilirubins.
abstract: 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 XIIIalpha is tending to adopt as ridge-tile conformation, rather than linear conformation.
authors.affiliation: Department of Analysis-Measurement Science, Wuhan University, People's Republic of China. jmhu@whu.edu.cn
authors.forename: J
authors.initials: J
authors.lastname: Hu
authors.forename: T
authors.initials: T
authors.lastname: Wang
authors.forename: D
authors.initials: D
authors.lastname: Moigno
authors.forename: M
authors.initials: M
authors.lastname: Wumaier
authors.forename: W
authors.initials: W
authors.lastname: Kiefer
authors.forename: J
authors.initials: J
authors.lastname: Mao
authors.forename: Q
authors.initials: Q
authors.lastname: Wu
authors.forename: F
authors.initials: F
authors.lastname: Niu
authors.forename: Y
authors.initials: Y
authors.lastname: Gu
authors.forename: Q
authors.initials: Q
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Ma
authors.forename: H
authors.initials: H
authors.lastname: Feng
mesh_terms: D001663:Bilirubin / Q000031:analogs & derivatives* / Q000737:chemistry*; D015394:Molecular Structure; D011758:Pyrroles / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: C459461:2,7,9-trimethyl-8-ethoxycarbonylethylpyrromethenone; D011758:Pyrroles; C459460:kryptopyrrolmethene; C013337:xanthobilirubic acid; D001663:Bilirubin