Water-soluble polystyrene latexes as photoredox media. 2. Excited-state electron transfer from anthracene covalently bound poly(methacrylic acid)

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

DOI:https://doi.org/10.1021/j100133a028· OSTI ID:5903784

Hsiao, J S; Webber, S E ^[1]

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

Poly(methacrylic acid)-co-2-(9-anthryl)ethylmethacrylate, abbreviated as PMA-A hereafter, has been adsorbed at the interface of water-soluble latexes, referred to as microspheres (abbreviated as [mu]S). Two distinct stages of the adsorption processes of the polymer at [mu]S interfaces are observed that depend on pH. The initial association stage is quickly achieved (<3 min) after mixing the polymer and [mu]S in aqueous solution. The final equilibration of the polymer at the interface requires about 2 days to reach equilibrium. Excited-state quenching of PMA-A via electron transfer at interfaces of [mu]S has been measured using a zwitterionic viologen SPV (4,4[prime]-bipyridinyl-l,l[prime]-bis(propanesulfonate)). The [mu]S interface provides a unique environment for the anthracene moiety of PMA-A. Charge separation was found in all cases with the largest yield at high pH for the triplet state and at low pH for the singlet state. There is little sensitivity to the environment for triplet-state electron transfer because the dominant factor is the spin-forbidden recombination of the reactive charge pair. The efficiency of triplet-state charge separation at the [mu]S interface was found to be comparable to homogeneous solution. 17 refs., 14 figs., 4 tabs.

• DOE Contract Number: FG05-86ER13629
• OSTI ID: 5903784
• 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

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
400500* -- Photochemistry
ADSORPTION
CHEMICAL REACTIONS
DATA
DISPERSIONS
ELASTOMERS
ELECTRON TRANSFER
EXPERIMENTAL DATA
FLUORESCENCE
INFORMATION
LATEX
LUMINESCENCE
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PH VALUE
PHOTOCHEMICAL REACTIONS
POLYMERS
RUBBERS
SOLUTIONS
SORPTION