title: Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP).
abstract: Porphyrins are an important class of organic molecules, with interesting linear and nonlinear optical properties given mainly by their extended π-conjugation structure. Their photophysical properties can be greatly affected by the surrounding environment, which can be used to tune its final properties. Here we report on an experimental study of the photophysical properties of meso-tetrakis (methylpyridiniumyl) porphyrin (TMPyP) in aqueous and in several organic solvents and its interaction with micelles formed from negatively charged sodium dodecylsulphate (SDS), positively charged cetyl trimethyl ammonium bromide (CTAB) and neutral TRITON X-100. By using the Z-scan technique, flash-photolysis and time-resolved fluorescence techniques, we were able to evaluate the excited state dynamics of the TMPyP, and observed that the tetrapyrrole ring plays important role due to hydrogen bonds formation between nitrogen atom and water, while the side groups determine the porphyrin localization in non-aqueous micelle part.
authors.affiliation: Instituto de Física, Universidade Federal de Goiás, Caixa Postal 131, 74001-970 Goiânia, GO, Brazil. pablo@if.ufg.br
authors.forename: P J
authors.initials: PJ
authors.lastname: Gonçalves
authors.forename: P L
authors.initials: PL
authors.lastname: Franzen
authors.forename: D S
authors.initials: DS
authors.lastname: Correa
authors.forename: L M
authors.initials: LM
authors.lastname: Almeida
authors.forename: M
authors.initials: M
authors.lastname: Takara
authors.forename: A S
authors.initials: AS
authors.lastname: Ito
authors.forename: S C
authors.initials: SC
authors.lastname: Zílio
authors.forename: I E
authors.initials: IE
authors.lastname: Borissevitch
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D006860:Hydrogen Bonding; D017830:Octoxynol / Q000737:chemistry*; D010777:Photochemistry; D011166:Porphyrins / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D002593:Cetrimonium Compounds; D011166:Porphyrins; D012967:Sodium Dodecyl Sulfate; C021096:tetra(4-N-methylpyridyl)porphine; D017830:Octoxynol; D000077286:Cetrimonium