Water-soluble polystyrene latexes as photoredox media. 1. Interfacial fluorescence quenching and triplet-state electron transfer from pyrene and 1-pyrenebutyric acid

Journal Article · Thu Aug 05 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100133a027· OSTI ID:6094611

Hsiao, J S; Webber, S E ^[1]

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1. Univ. of Texas, Austin (United States)

Aromatic chromophores (pyrene and 1-pyrenebutyric acid) have been adsorbed on water-soluble polystyrene latex particles (commercially referred to as microspheres) from the aqueous phase. The fluorescence properties and quenching efficiencies of these chromophores have been measured using a zwitterionic viologen SPV (4,4[prime]-bipyridino-l,l[prime]-bis(propanesulfonate)). The quenching mechanism has been found to be diffusion controlled. The electron-transfer quenching of the triplet state by SPV was characterized. Triplet-state quenching does not occur for pyrene embedded in these polystyrene latexes in aqueous solution, which is attributed to the hydrophobic protection of the pyrene from the approach of water-soluble SPV. On the other hand, the efficiencies of charge separation for l-pyrenebutyric acid both in homogeneous aqueous solution and adsorbed on polystyrene latexes in aqueous solution were found to be high. It is proposed that the amphiphilic l-pyrenebutyric acid molecules prefer to reside at the aqueous interface of the latexes. These results demonstrate that [open quotes]compartmentalization[close quotes] of ion pairs, produced by redox quenching, can be achieved when l-pyrenebutyric acid molecules are located at these interfaces. This provides a strategy for more efficient utilization of excited-state redox processes. 17 refs., 9 figs., 5 tabs.

• DOE Contract Number: FG05-86ER13629
• OSTI ID: 6094611
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:31; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
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ADSORPTION
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CONDENSED AROMATICS
CONVERSION
DATA
DISPERSIONS
ELASTOMERS
ELECTRON TRANSFER
ENERGY CONVERSION
EXPERIMENTAL DATA
FLUORESCENCE
HYDROCARBONS
INFORMATION
LATEX
LUMINESCENCE
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHOTOCHEMICAL REACTIONS
POLYMERS
PYRENE
RUBBERS
SOLAR ENERGY CONVERSION
SOLUTIONS
SORPTION