Magnetic resonance studies of photo-induced electron transfer reactions
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:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-84ER13242
- OSTI ID:
- 6889113
- Report Number(s):
- DOE/ER/13242-9; ON: DE93012239
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic resonance studies of photosynthetic reaction centers and porphyrins: Progress report, June 1, 1987-January 10, 1988
Photooxidation of zinc tetraphenylporphyrin by benzoquinone: A fourier transform electron paramagnetic resonance investigation
Related Subjects
400500* -- Photochemistry
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACETONE
ADSORBENTS
ALCOHOLS
AROMATICS
BENZOQUINONES
CARBON
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DISPERSIONS
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ELECTRON TRANSFER
ELEMENTS
FOURIER TRANSFORMATION
FULLERENES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN TRANSFER
HYDROXY COMPOUNDS
INTEGRAL TRANSFORMATIONS
IRRADIATION
KETONES
LASER RADIATION
MAGNETIC RESONANCE
MICELLAR SYSTEMS
MIXTURES
MULTIPLETS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOTOCHEMICAL REACTIONS
PORPHYRINS
PROGRESS REPORT
PROPANOLS
PULSED IRRADIATION
QUINONES
RADIATIONS
RADICALS
RESONANCE
SILICA GEL
SOLUTIONS
SULFONATES
TRANSFORMATIONS
TRIPLETS
ZINC COMPLEXES