Electronic energy migration and trapping in quinone-substituted, phenyl-linked dimeric and trimeric porphyrins
Journal Article
·
· Journal of the American Chemical Society; (United States)
- Univ. of Texas, Austin (United States)
The synthesis and photophysical characterization of a series of quinone-substituted, phenyl-linked dimeric and trimeric porphyrin arrays suitable for the study of electron transfer within closely-coupled subunits is presented. The excited singlet state of a porphyrin possessing a quinone substituent at a meso position is shortened to <350 fs due to electron donation to the appended quinone. Energy transfer between adjacent porphyrins occurs with a rate constant of ca. 10[sup 11] s[sup [minus]1], and the photon is immediately trapped by the proximal porphyrin. For the liner porphyrin trimer, the photon can transfer between distal and central porphyrins in an incoherent manner until it is trapped by the proximal porphyrin. These arrays represent interesting models for natural photosynthetic organisms since they combine light harvesting, energy migration and trapping, and photoinduced electron transfer in a single supramolecular entity. 46 refs., 6 figs., 1 tab.
- OSTI ID:
- 6310601
- Journal Information:
- Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 115:11; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
AROMATICS
BOSONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DATA
ELECTRON TRANSFER
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LUMINESCENCE
MASSLESS PARTICLES
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTONS
PHOTOSYNTHESIS
PHYSICAL PROPERTIES
PORPHYRINS
SPECTROSCOPY
SYNTHESIS
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
AROMATICS
BOSONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DATA
ELECTRON TRANSFER
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LUMINESCENCE
MASSLESS PARTICLES
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTONS
PHOTOSYNTHESIS
PHYSICAL PROPERTIES
PORPHYRINS
SPECTROSCOPY
SYNTHESIS