Photoinduced electron transfer from dialkyl nitroxides to halogenated solvents

Journal Article · Fri Feb 02 00:00:00 EST 1990 · Journal of Organic Chemistry; (United States)

DOI:https://doi.org/10.1021/jo00290a046· OSTI ID:6012910

Chateauneuf, J ^[1]; Lusztyk, J; Ingold, K U ^[2]

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1. National Research Council of Canada, Ottawa, Ontario (Canada)
2. Univ. of Notre Dame, IN (United States)

Laser flash photolysis (LFP) at wavelengths within the charge-transfer absorption present in CCl{sub 4} solutions of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) yields the oxoammonium chloride of TEMPO, 1 ({lambda}{sub max} = 460 nm), and the trichloromethyl radical in an essentially instantaneous ({le}18 ps) process. The primary photochemical event is an electron transfer from TEMPO to CCl{sub 4}, and this is followed by immediate decomposition of the CCl{sub 4}{sup {sm bullet}{minus}} radical anion to Cl{sup {minus}} and Cl{sub 3}C{sup {sm bullet}}. An independent synthesis of 1 confirmed that the absorption attributed to this species has been correctly assigned. The formation of Cl{sub 3}C{sup {sm bullet}} was inferred by its trapping by molecular oxygen. LFP of TEMPO in other halogenated solvents and of other nitroxides in halogenated solvents has confirmed the generality of these photoreactions.

• OSTI ID: 6012910
• Journal Information: Journal of Organic Chemistry; (United States), Vol. 55:3; ISSN 0022-3263
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANIC NITROGEN COMPOUNDS
ELECTRON TRANSFER
ALKYL RADICALS
BENZENE
BROMINATED ALIPHATIC HYDROCARBONS
CARBON TETRACHLORIDE
CHLOROFORM
FREONS
LASER RADIATION
METHYLENE CHLORIDE
PHOTOLYSIS
PIPERIDINES
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
AMINES
AROMATICS
AZINES
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PYRIDINES
RADIATIONS
RADICALS
SPECTRA
400500* - Photochemistry
400201 - Chemical & Physicochemical Properties