Efficient photoinduced orthogonal energy and electron transfer reactions via phospholipid membrane-bound donors and acceptors

Journal Article · Wed Oct 05 00:00:00 EDT 1994 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00099a035· OSTI ID:6835607

Clapp, P J; Armitage, B; Roosa, P; O'Brien, D F ^[1]

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1. Univ. of Arizona, Tucson, AZ (United States)

A three component, liposome-bound photochemical molecular device (PMD) consisting of energy and electron transfer reactions is described. Bilayer membrane surface-associated dyes, 5,10,15,20-tetrakis[4-(trimethylammonio)-phenyl]-21H,2 3H-porphine tetra-p-tosylate salt and N,N[prime]-bis[(3-trimethylammonio)propyl]thiadicarbocya nine tribromide, are the energy donor and acceptor, respectively, in a blue light stimulated energy transfer reaction along the vesicle surface. The electronically excited cyanine is quenched by electron transfer from the phospholipid membrane bound triphenylbenzyl borate anion, which is located in the lipid bilayer interior. The PMD exhibits sequential reactions following electronic excitation with the novel feature that the steps proceed with orthogonal orientation: energy transfer occurs parallel to the membrane surface, and electron transfer occurs perpendicular to the surface. Photobleaching and fluorescence quenching experiments verify the transfer reactions, and Stern-Volmer analysis was used to estimate the reaction rate constants. At the highest concentrations examined of energy and electron acceptor ca. 60% of the photoexcited porphyrins were quenched by energy transfer to the cyanine. 56 refs., 6 figs., 3 tabs.

• OSTI ID: 6835607
• Journal Information: Journal of the American Chemical Society; (United States), Vol. 116:20; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
DYES
BLEACHING
PHOTOCHEMICAL REACTIONS
ELECTRONS
EXCITATION
BINDING ENERGY
CHEMICAL REACTION KINETICS
CYANINE DYES
ELECTRON TRANSFER
ENERGY TRANSFER
FLUORESCENCE
LIPOSOMES
MATHEMATICAL MODELS
MEMBRANES
PHOSPHOLIPIDS
PHOTOSYNTHESIS
PORPHYRINS
SCINTILLATION QUENCHING
VALENCE
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
ELEMENTARY PARTICLES
ENERGY
ENERGY-LEVEL TRANSITIONS
ESTERS
FERMIONS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
LEPTONS
LIPIDS
LUMINESCENCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
REACTION KINETICS
SYNTHESIS
400201* - Chemical & Physicochemical Properties
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)