Photoinduced electron transfer from (alkoxyphenyl)triphenylporphyrins to interface water of aerosol dioctyl- and cetyltrimethylammonium bromide/alcohol reverse micelles at 77 K

Journal Article · Thu Jan 20 00:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100054a048· OSTI ID:5067827

Kang, Y S; McManus, H J.D.; Liang, K; Kevan, L ^[1]

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1. Univ. of Houston, TX (United States)

Photoinduced electron transfer from (alkoxyphenyl)triphenylporphyrins (C[sub n]OPTPP) to the interface water of anionic aerosol dioctyl- (AOT) and cationic cetytrimethylammonium bromide/alcohol (CTAB/ROH) reverse micelles at 77 K produces paramagnetic (alkoxyphenyl)triphenylporphyrin cation radical (C[sub n]OPTPP[sup +]). The photoproduced radicals are identified and quantitated with electron spin resonance by measuring the g factor, hyperfine splitting, and the doubly integrated spectrum. The photoproduced radical yields are correlated with the deuterium modulation depth of C[sub n]OPTPP[sup +] by electron spin-echo modulation (ESEM), which measures changes in the interaction distance of the porphyrin cation headgroup with water (D[sub 2]O) at the reverse micelle interface as a function of the C[sub n] alkyl chain length. The location of the porphyrin cation headgroup relative to interface water (D[sub 2]O) is controlled by the alkyl chain length of C[sub n]OPTPP, the cosurfactant alcohol and the headgroup charge of the surfactant forming the reverse micelle. A longer alkyl chain decreases the photoyield because of increased hydrophobic interaction between C[sub n]OPTPP and the surfactant alkyl chains of the reverse micelles which [open quotes]pulls[close quotes] the porphyrin moiety more into the alkane region of the reverse micelles. 34 refs., 7 figs.

• OSTI ID: 5067827
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:3; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
MICELLAR SYSTEMS
ELECTRON TRANSFER
PORPHYRINS
AEROSOLS
AMMONIUM COMPOUNDS
BUTANOLS
ELECTRON SPIN RESONANCE
HEAVY WATER
OCTANOLS
PHOTOCHEMICAL REACTIONS
RADICALS
WATER
ALCOHOLS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COLLOIDS
DISPERSIONS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RESONANCE
SOLS
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Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry
400102 - Chemical & Spectral Procedures