Fluorescence quenching of water-soluble porphyrins. A novel fluorescence quenching of anionic porphyrin by anionic anthraquinone
The fluorescence quenching of 5-phenyl-10,15,20-tris(p-sulfonatophenyl)porphine (TPPS/sup 3 -/) and 5,10,15,20-tetrakis(4-N-methylpyridyl)porphine (TMPyP/sup 4 +/) has been studied in water (pH 8.0) by using 9,10-anthra-quinone-2,6-disulfonate (AQDS/sup 2 -/) and methyl viologen (MV/sup 2 +/) as quenchers. While electrostatic repulsion is expected, AQDS/sup 2 -/ quenched the TPPS/sup 3 -/ fluorescence more efficiently than MV/sup 2 +/. The steady-state and time-resolved fluorescence measurements indicated that static quenching took place in the TPPS/sup 3 -/-AQDS/sup 2 -/ system. Studies on the absorption spectra and the effects of ionic strength on the fluorescence quenching indicated the formation of the ground-state complex of TPPS/sup 3 -/ and AQDS/sup 2 -/. The thermodynamic parameters (..delta..H and ..delta..S) suggested that the ground-state complex was formed via van der Walls interaction.
- Research Organization:
- Kyushu Univ., Fukuoka, Japan
- OSTI ID:
- 5903740
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:4; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ABSORPTION SPECTRA
ANIONS
ANTHRAQUINONES
AQUEOUS SOLUTIONS
AROMATICS
CARBOXYLIC ACIDS
CHARGED PARTICLES
DISPERSIONS
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
IONS
LUMINESCENCE
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PORPHYRINS
QUENCHING
QUINONES
SOLUTIONS
SPECTRA
SULFONATES
THERMODYNAMICS
VAN DER WAALS FORCES