Picosecond time-resolved emission studies. I. Real-time measurements of solvent-solute interactions. II. Kinetics of energy flow in a photosynthetic antenna system. [4-aminophthalimide]
Using a picosecond fluorimeter, the dynamics of solvation of electronically excited 4-aminophthalimide in a variety of solvents is measured. The solvation process is manifested by a time-dependent red shift in the emission spectrum in certain solvents. This red shift is time-resolved using a streak camera system. The time constant of the relaxation is found to correlate strongly with the longitudinal dielectric relaxation rate of the solvent. The correlation holds for changes in solvent, for isotopic substitution of a solvent, and for changes in temperature. Never before have direct measurements of excited-state solvation dynamics been shown to correlate with dielectric relaxation over such a wide range of experimental conditions. Emission from certain photosynthetic antenna complexes, phycobilisomes, and from the building blocks of phycobilisomes, phycobiliproteins, has also been studied using the streak camera system. Both the rising and filling portions of the time-resolved emission profiles of the fluorescing chromophores in these structures are studied. The rates of energy transfer between structural domains of the antenna complex and within the isolated biliprotein complexes are deduced from these studies. Comparison of emission profiles from a series of structurally distinct phycobilisomes isolated from three related strains of cyanobacteria have provided new insights into the correlation of the energy transfer function and macromolecular structure in these light-harvesting antenna systems. 133 refs., 58 figs., 14 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5981161
- Report Number(s):
- LBL-20662; ON: DE86006001
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
ACETONE
DIELECTRIC PROPERTIES
SOLVENT PROPERTIES
ACETONITRILE
BUTANOLS
DEUTERIUM
ISOTOPE EFFECTS
DMSO
ETHANOL
IMIDES
EMISSION SPECTRA
SOLVATION
PENTANOLS
PHYCOBILISOMES
PROPANOLS
TOLUENE
EXPERIMENTAL DATA
FLUORIMETERS
PHOTOSYNTHESIS
STREAK CAMERAS
TEMPERATURE DEPENDENCE
TIME RESOLUTION
ALCOHOLS
ALKYLATED AROMATICS
AROMATICS
CAMERAS
CELL CONSTITUENTS
CHEMICAL REACTIONS
DATA
ELECTRICAL PROPERTIES
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROXY COMPOUNDS
INFORMATION
ISOTOPES
KETONES
LIGHT NUCLEI
MEASURING INSTRUMENTS
NITRILES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYSICAL PROPERTIES
RADIATION DETECTORS
RESOLUTION
SPECTRA
STABLE ISOTOPES
SULFOXIDES
SYNTHESIS
TIMING PROPERTIES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400104 - Spectral Procedures- (-1987)
400500 - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)