Photoinduced and redox-induced transmembrane processes with vesicle-stabilized colloidal cadmium sulfide and multicharged viologen derivatives

Journal Article · Thu Apr 18 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100161a051· OSTI ID:5756878

Tricot, Y M; Porat, Z; Manassen, J ^[1]

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1. Weizmann Inst. of Science, Rehovot (Israel)

Colloidal cadmium sulfide (CdS) and methylviologen (MV{sup 2+}) or new viologen derivatives carrying more positive charges were placed at specific sites of dihexadecyl phosphate (DHP) vesicles. Benzyl alcohol was used as a sacrificial electron donor to promote reduction of the viologens by photoexcited CdS colloid majority carriers. Transmission electron microscopy, {sup 13}C nuclear magnetic resonance, and differential scanning calorimetry were used for physical characterization. Photochemical events were followed by in situ optical and electrochemical monitoring. Redox-induced transmembrane diffusion, which had been found with MV{sup 2+}, could be reduced by a factor 18 by using a triply charged viologen derivative and by a further factor of 30 in a configuration involving transmembrane electron transfer. In that case the quantum yield was ca. 0.05 at 410 nm, while virtually no reduced viologen leaking could be observed during at least 10 min. Physical evidence was found for a partial penetration of the CdS colloids into the DHP membrane.

• OSTI ID: 5756878
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:8; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ALCOHOLS
AROMATICS
BENZYL ALCOHOL
BIOMIMETIC PROCESSES
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CALORIMETRY
CARBON 13
CARBON ISOTOPES
CHALCOGENIDES
CHARGE STATES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHROMATOGRAPHY
COLLOIDS
DATA
DISPERSIONS
ELECTRON MICROSCOPY
ENERGY STORAGE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
INORGANIC PHOSPHORS
ION EXCHANGE CHROMATOGRAPHY
ISOTOPES
LIGHT NUCLEI
LIQUID COLUMN CHROMATOGRAPHY
MAGNETIC RESONANCE
MATHEMATICAL MODELS
MEMBRANE TRANSPORT
MEMBRANES
MICROSCOPY
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOSPHORS
PHOTOCHEMICAL ENERGY STORAGE
PHOTOCHEMICAL REACTIONS
REDUCTION
RESONANCE
SAMPLE PREPARATION
SEPARATION PROCESSES
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
STORAGE
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
VOLTAMETRY