Magnetic resonance studies of photo-induced electron transfer reactions. Final report, June 1, 1990--May 31, 1993

Technical Report · Sun Nov 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/10142337· OSTI ID:10142337

van Willigen, H

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
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500
665100
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACETONE
BENZOQUINONES
ELECTRON SPIN RESONANCE
ELECTRON TRANSFER
FOURIER TRANSFORMATION
FULLERENES
HYDROGEN TRANSFER
LASER RADIATION
MICELLAR SYSTEMS
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PORPHYRINS
PROGRESS REPORT
PROPANOLS
PULSED IRRADIATION
RADICALS
SILICA GEL
SOLUTIONS
SULFONATES
TRIPLETS
ZINC COMPLEXES