Porphyrins XVII. Vapor absorption spectra and redox reactions: Tetraphenylporphins and porphin

Theoretical study of the electronic spectrum of magnesium-porphyrin

“…was used for the level-shift. For the sake of comparison, the experimental values determined from the gas-phase absorption spectra of two different substituted magnesiumporphyrins 16,17 are also included in Table IV. As far as we know, the absorption spectrum of MgP itself has not been reported.…”

“…At the same time, the absorption spectra of substituted metal-porphyrins were measured in solution by Caughey et al, 15 extending the energy range previously studied. 10 Two weak bands were detected in the UV region down to 250 nm for which Caughey et al 15 introduced the generic names N and L. The four main bands ͑Q, B, N, and L͒ were then assigned on the basis of the PPP calculations of Weiss et al 14 As far as we know, the first and most extensive investigation on the spectroscopic properties of porphyrins in gas phase was performed by Edwards et al 16,17 They studied the gas-phase absorption spectra of octalkylporphyrins 16 and tetraphenylporphyrins 17 in the energy range 800-200 nm ͑1.5-6.2 eV͒, identifying a new high energy band, M band, around 6 eV. On the other hand, transient absorption spectroscopy has also been applied to metal-porphyrins in order to determine the spectral features which characterize the dif-ferent types of excited states (→*, charge transfer metalring, and metal (d,d) states͒.…”

First-principles study of photoinduced electron-transfer dynamics in a Mg–porphyrin–quinone complex

“…in the S 1 state) the 0-0 excitation carries a very large fraction of the total intensity. [26,27] This suggests that the equilibrium geometries and normal modes of Mg-porphyrin in the first excited state and in the ground state can be assumed to be identical without significant loss of accuracy. This approximation allows us to strongly reduce the computational cost by avoiding the expensive calculation of the excited-state normal vibrations.…”

Oxidase Activity of Iron and Manganese Porphyrins with Antioxidant 2,6-Di-tert-butylphenol Groups

“…[13][14][15][16][17][18] Получены серии порфиринов, содержащих фенольные (1-2) или фенильные (1а-2а) заместители.…”