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Electron spin resonances and electron spin echo modulation studies of N,N,N',N'-tetramethylbenzidine photoionization in anionic micelles: structural effects of tetramethylammonium cation counterion substitution for sodium cation in dodecyl sulfate micelles

Journal Article · · J. Am. Chem. Soc.; (United States)
DOI:https://doi.org/10.1021/ja00329a005· OSTI ID:6319127
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Comparative electron spin resonance and electron spin echo modulation studies have been carried out for the radical cation produced by photoionization of N,N,N'N'-tetramethylbenzidine in micellar sodium dodecyl sulfate (SDS) and tetramethylammonium dodecyl sulfate (TMADS) solutions. The substitution of tetramethylammonium ion for sodium ion brings about a marked increase in photoionization efficiency at 77K which correlates with increased photoproduced cation-water interactions as determined by electron spin echo modulation (ESEM) experiments. ESEM experiments have also been performed for a series of x-doxylstearic acids as paramagnetic probes in both micellar solutions. The data indicate more water penetration in TMADS than SDS micelles. The results have been explained in terms of a decrease in the compactness of the micelle polar head-group region and increased surface roughness by the substitution of the more hydrophobic tetramethylammonium cation for sodium cation. 18 references, 6 figures.
Research Organization:
Univ. of Houston, TX
OSTI ID:
6319127
Journal Information:
J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 106:17; ISSN JACSA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACOUSTIC ESR
ALKALI METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
ANIONS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CORRELATIONS
DATA
DATA ANALYSIS
DECOMPOSITION
EFFICIENCY
ELECTRON SPIN RESONANCE
ENERGY-LEVEL TRANSITIONS
ESTERS
EXCITATION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
IONIZATION
IONS
LOW TEMPERATURE
MAGNETIC RESONANCE
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
PHOTOLYSIS
QUATERNARY COMPOUNDS
RESONANCE
SODIUM COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
SULFURIC ACID ESTERS
WATER