Manifestation of Peripheral NO2-Substitution in the Resonance Raman Scattering Spectra of Tetraarylporphyrins

摘要: The resonance Raman scattering (RS) spectra of a series nitro-substituted derivatives the free base tetraphenyl porphyrin that were obtained on continuous excitation near Soret band have been investigated. For molecules in which NO2 group is located β-position pyrrole rings or para-position meso-phenyl substituents, an intense line mode within range 1340–1355 cm−1 discovered. Based RS diprotonated nitro-tetraarylporphyrins, it assigned to symmetrical vibration nitro (ν s NO2). Activation ν indicative existence π-delocalization effect for number porphyrins at interaction between molecular orbitals nitro-substituents and macrocycle occurs. Moreover, typical both direct addition nitro-substituent ring its binding via group. results demonstrate informative value spectroscopy creating studying model donor–acceptor systems with participation porphyrins.