Flash photolysis-pulse radiolysis spectroscopy. Reactions of photoexcited metalloporphyrins with short-lived radicals

Journal Article · Thu Dec 10 04:00:00 EST 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150625a008· OSTI ID:5548047

Levanon, H; Neta, P

Simultaneous flash photolysis and pulse radiolysis of metalloporphyrin (MP) solutions allowed the formation of photoexcited triplets (MP/sup T/) and observation of their reactions with short-lived radicals. A light pulse of 1-5 ms duration produced a steady-state concentration of triplets and was followed by a delayed electron pulse which produced radicals from the solvent. The reactions of these radicals with the MP/sup T/ were followed spectrophotometrically over 0.1-4 ms. It is found that the reactions of triplet porphyrins with solvent radicals are highly selective and yield intermediates different than those produced from the ground-state porphyrins. Application of this double pulsing technique is demonstrated by the reactins of MP/sup T/ with radicals in both nonaqueous and aqueous solutions.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 5548047
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:25; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
ABSORPTION SPECTRA
CARBOXYLIC ACIDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
MULTIPLETS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PORPHYRINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
SPECTRA
TRIPLETS