Organic photochemical storage of solar energy. Progress report, March 1, 1978-January 31, 1979

Technical Report · Thu Feb 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/6084358· OSTI ID:6084358

Jones, G II

Photosensitization mechanisms for driving energy storing reactions of readily available organic compounds have been studied. Aromatic sensitizers were used as complexing agents for a series of non-conjugated dienes which are capable of valence isomerization. Diene exciplexes, shown to be stabilized by electron donor-acceptor interaction, led to photoisomers with high chemical and quantum efficiency in two of the cases studied. For other systems, sensitizer-diene photoaddition reactions were observed. Exciplex isomerization of quadricyclanes and hexamethyldewarbenzene was studied. Factors determining the efficiency of rearrangement of excited complexes were examined including the role of exciplex excitation energy in controlling the novel adiabatic exciplex isomerization of hexamethyldewarbenzene. With triplet photosensitizers visible light (to 520 nm) was used to bring about an energy storing valence isomerization of a diester derivative of norbornadiene. High quantum yields (0.6) were measured at the longest wavelengths yet utilized for this type of isomerization. The quantum efficiency for isomerization using a very low energy triplet sensitizer was significantly enhanced at slightly elevated temperatures, suggesting that thermal energy (in amounts present in solar collector media) can be an aid in driving energy storing photo-reactions.

• Research Organization: Boston Univ., MA (USA). Dept. of Chemistry
• DOE Contract Number: EG-77-S-02-4380
• OSTI ID: 6084358
• Report Number(s): COO-4380-2
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
25 ENERGY STORAGE
250800 -- Energy Storage-- Chemical
ALKANES
ALKENES
AROMATICS
CHEMICAL REACTIONS
COMPLEXES
CYCLOALKANES
CYCLOALKENES
DIENES
EFFICIENCY
ELECTRON TRANSFER
ENERGY STORAGE
ENERGY TRANSFER
FLUORESCENCE
HYDROCARBONS
IONIZATION POTENTIAL
ISOMERIZATION
ISOMERS
LUMINESCENCE
NORBORNADIENE
ORGANIC COMPOUNDS
PHOTOCHEMICAL ENERGY STORAGE
PHOTOCHEMICAL REACTIONS
POLYENES
QUADRICYCLENE
REAGENTS
REDOX REACTIONS
SENSITIZERS
STORAGE