Photoionization of alkylphenothiazines in vesicles: Effects of the alkyl chain length and the vesicle surface charge

Journal Article · Thu Jan 25 00:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100365a067· OSTI ID:6882240

Sakaguchi, Masato; Hu, Ming; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

The photoionization of alkylphenothiazine (AP = alkylphenothiazine) in vesicles were observed by electron spin resonance (ESR) and electron spin echo modulation (ESEM) methods. Alkylphenothiazine derivatives including sodium 10-methylphenothiazinesulfonate (C{sub 1}PSO{sub 3}Na), sodium 10-dodecylphenothiazinesulfonate (C{sub 12}PSO{sub 3}Na), sodium 3-(10{prime}-phenothiazinyl)propane-1-sulfonate (PC{sub 3}SO{sub 3}Na), sodium 6-(10{prime}-phenothiazinyl)hexane-1-sulfonate (PC{sub 6}SO{sub 3}Na), and sodium 12-(10{prime}-phenothiazinyl)dodecane-1-sulfonate (PC{sub 12}SO{sub 3} Na) were synthesized and used to study the effects of the alkyl chain length, the position of the sulfonate group, and the vesicle surface charge on the photoionization. A single ESR spectrum due to the alkylphenothiazine cation radicals (AP{sup +}) was observed from rapidly frozen AP in dioctadecyldimethylammonium chloride (DODAC) or dihexadecyl phosphate (DHP) vesicles photoirradiated for 10 min with {lambda} > 300 nm. In DODAC vesicles with a positive surface charge, the photoionization yield of PC{sub 12}SO{sub 3}Na with a sulfonate group at the dodecyl chain end is higher than that of C{sub 12}PSO{sub 3}Na with a sulfonate group on the phenothiazine ring. The photoionization yields of AP having the sulfonate group at the alkyl chain end in DODAC vesicles increase with decreasing alkyl chain length. The highest photoionization yield was obtained from PC{sub 3}SO{sub 3}Na, which has the shortest alkyl chain in this study and has the sulfonate group at the end of the propyl chain. The photoionization yield of AP in DHP vesicles with a negative surface charge was not changed by added alkyl chains or the position of the sulfonate group in AP. The results are discussed in terms of the alkyl chain length, the position of the sulfonate group, and the vesicle surface charge.

• OSTI ID: 6882240
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:2; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
PHENOTHIAZINES
PHOTOIONIZATION
DATA ANALYSIS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
MICELLAR SYSTEMS
SOLAR ENERGY CONVERSION
AZINES
CONVERSION
DATA
ENERGY CONVERSION
HETEROCYCLIC COMPOUNDS
INFORMATION
IONIZATION
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RESONANCE
360603* - Materials- Properties
400500 - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)