title: Fourier-transform Raman and infrared spectroscopic analysis of 2-nitro-tetraphenylporphyrin and metallo-2-nitro-tetraphenylporphyrins.
abstract: The Fourier-transform Raman (FT-Raman) and infrared (FT-IR) spectra of 2-nitro-tetraphenylporphyrin (2-NO(2)-TPP), nickel-2-nitro-tetraphenylporphyrin (Ni-2-NO(2)-TPP), zinc-2-nitro-tetraphenylporphyrin (Zn-2-NO(2)-TPP) and copper-2-nitro-tetraphenylporphyrin (Cu-2-NO(2)-TPP) were acquired for the first time and carefully assigned and discussed. The effects of a beta-NO(2) group and the influence of the central metal on the molecular symmetry and vibrational spectra of the porphyrin macrocycle were also examined. The bands at 1323-1339, 1516-1526 and 961-971 cm(-1) were attributed to the symmetric and asymmetric stretching vibration of the NO(2) group and to the stretching vibration of the C(beta)-N bond, respectively, which connects the NO(2) group with the beta-carbon of the porphyrin macrocycle. These bands can act as a marker to distinguish beta-NO(2) TPPs from other beta-substituent TPPs. Cu-2-NO(2)-TPP has a C(4nu) molecular symmetry, which is different from those of Ni-2-NO(2)-TPP and Zn-2-NO(2)-TPP, i.e. D(4h).
authors.affiliation: College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China. jmhu@whu.edu.cn
authors.forename: J
authors.initials: J
authors.lastname: Hu
authors.forename: I
authors.initials: I
authors.lastname: Pavel
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: Z
authors.initials: Z
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Ye
authors.forename: Q
authors.initials: Q
authors.lastname: Wu
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: S
authors.initials: S
authors.lastname: Chen
authors.forename: F
authors.initials: F
authors.lastname: Niu
authors.forename: Y
authors.initials: Y
authors.lastname: Gu
mesh_terms: D009942:Organometallic Compounds / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D009942:Organometallic Compounds; D011166:Porphyrins; C409084:tetraphenylporphyrin