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Self-association of free base porphyrins with aminoacid substituents in AOT rev...
Andrade, Suzana M.; Teixeira, Catarina; Togashi, Denisio M.; Costa, Sílvia M.B.; Sobral, Abílio J.F.N.The aggregation properties of aminosulfonyl porphyrins with aminoacid substituents: methionine with the acid function methylated, PMetCH3; phenylalanine, PPhe; attached to the para positions of the meso phenyls of the porphyrin, was followed in organic solvents, water-dioxane mixtures and in reverse micelles of aerosol OT (AOT RM), using absorption, steady-state and time-resolved fluorescence. In AOT RM in the ...
Electric polarization effects on the electronic spectral shift of centrosymmetr...
Togashi, Denisio M.; Costa, Sílvia M. B.; Sobral, Abílio J. F. N.; Gonsalves, A. M. d'A. R.The classic dielectric dipolar Onsager model was extended to include quadrupolar interactions between solute molecules and solvents with different polarities. A multiparametric solvatochromic expression, based on the point quadrupole moment inside a spherical cavity embedded in a dielectric continuum, is applied to centrosymmetric sulfonamide porphyrins, zinc tetraphenyl porphyrin, squaraine and 9,10-dicyanoant...
Self-Aggregation of Lipophilic Porphyrins in Reverse Micelles of Aerosol OT
Togashi, Denisio M.; Costa, Sílvia M. B.; Sobral, Abílio J. F. N.; Gonçalves, A. M. d'A. R.The aggregation process of meso-tetra(4-aminosulfonylphenyl)porphyrin (PC0), of butyl and dodecyl derivatives (PC4 and PC12, respectively) in the presence of aerosol-OT (AOT) reversed micelles with different values of ω0 = [water]/[AOT] was investigated using steady-state extinction, fluorescence, and resonance light scattering (RLS) techniques. The scattering has been accounted for and the absorption spectra c...
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