Magnetic resonance studies of photo-induced electron transfer reactions. Final report, June 1, 1990--May 31, 1993
Fourier Transform Electron Paramagnetic Resonance (FT EPR) is useful in study of photochemical reactions: a microwave pulse rotates the electron spin magnetization vector from z (magnetic field) into xy plane ({pi}/2 pulse); the time evolution of magnetization in xy plane, the free induction decay (FID), is sampled. Fourier transform of FID gives the frequency domain EPR spectrum of the free radicals, and the method is ideal for time-resolved studies of free radicals produced by pulsed-laser excitation. Investigations of electron transfer reactions focused on porphyrin (donor) - quinone (acceptor) systems. First, two hydrogen abstraction reactions were studied with FT EPR: photoreduction of acetone with 2-propanol, yielding the acetone ketyl radical, and the reaction of 2-propanol with t-butoxy radicals. Then, the FT EPR study of benzoquinone or duroquinone anion radicals generated by pulsed-laser induced electron transfer from zinc tetraphenylporphyrin (ZnTPP) or tetrasulfonated Zn(TPP), was carried out in homogeneous solution, micellar solutions, and silica gel. Finally, FT EPR was used to study electron transfer quenching of triplet C{sub 60} by electron donors.
- Research Organization:
- Massachusetts Univ., Boston, MA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-84ER13242
- OSTI ID:
- 10142337
- Report Number(s):
- DOE/ER/13242-9; ON: DE93012239
- Resource Relation:
- Other Information: PBD: Nov 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON SPIN RESONANCE
FOURIER TRANSFORMATION
PHOTOCHEMICAL REACTIONS
ELECTRON TRANSFER
FULLERENES
TRIPLETS
PROGRESS REPORT
RADICALS
ZINC COMPLEXES
PORPHYRINS
PULSED IRRADIATION
LASER RADIATION
SULFONATES
BENZOQUINONES
SOLUTIONS
MICELLAR SYSTEMS
SILICA GEL
HYDROGEN TRANSFER
ACETONE
PROPANOLS
400500
665100
PHOTOCHEMISTRY
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS