Electronic excitation migration and trapping among cationic porphyrins adsorbed on anionic vesicle surface. Fractal-like behaviors
Journal Article
·
· J. Phys. Chem.; (United States)
Picosecond time-correlated single-photon-counting studies have been made on the electronic excitation migration among positively charged porphyrins, TAPP (5,10,15,20-tetrakis(4-trimethylammonio)phenyl)porphyrin, tosylate) and ZnTMPyP (zinc 5,10,15,20-tetrakis(1-methyl-4-pyridinyl)porphyrin, chloride), adsorbed on a negatively charged surface of DHP (dihexadecyl phosphate) vesicles and its trapping at porphyrin aggregates (dimer or higher associates). The observed fluorescence decay curves cannot be reproduced by decay functions derived assuming single-step transfer from porphyrin monomer to nonfluorescent aggregate uniformly distributed in two dimensions or three dimensions. The decay function for the case of single-step transfer derived on the basis of the fractal theory is also unable to reproduce the results. It has been confirmed that the fluorescence decay function derived for multistep excitation migration on fractal and fast trapping at the first trap encounter can reproduce satisfactorily the observed results, and the fracton dimension relevant to porphyrin monomer distribution on the vesicle has been estimated to be 1.65.
- Research Organization:
- Osaka Univ., Japan
- OSTI ID:
- 7149453
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:3; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ABSORPTION SPECTROSCOPY
ADSORPTION
ANIONS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
DATA
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
IONS
LUMINESCENCE
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PORPHYRINS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
VISIBLE SPECTRA
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ABSORPTION SPECTROSCOPY
ADSORPTION
ANIONS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
DATA
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
IONS
LUMINESCENCE
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PORPHYRINS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
VISIBLE SPECTRA