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:
- USDOE; 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
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON SPIN RESONANCE
FOURIER TRANSFORMATION
FULLERENES
ELECTRON TRANSFER
TRIPLETS
PHOTOCHEMICAL REACTIONS
ACETONE
BENZOQUINONES
HYDROGEN TRANSFER
LASER RADIATION
MICELLAR SYSTEMS
PORPHYRINS
PROGRESS REPORT
PROPANOLS
PULSED IRRADIATION
QUINONES
RADICALS
SILICA GEL
SOLUTIONS
SULFONATES
ZINC COMPLEXES
ADSORBENTS
ALCOHOLS
AROMATICS
CARBON
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DISPERSIONS
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ELEMENTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INTEGRAL TRANSFORMATIONS
IRRADIATION
KETONES
MAGNETIC RESONANCE
MIXTURES
MULTIPLETS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RADIATIONS
RESONANCE
TRANSFORMATIONS
400500* - Photochemistry
665100 - Nuclear Techniques in Condensed Matter Physics - (1992-)