Photocurrents in thin polymeric films. Chromophore/quencher assemblies based on polypyrrole

Journal Article · Thu Aug 23 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100380a042· OSTI ID:6187638

Downard, A J; Surridge, N A; Gould, S; Meyer, T J ^[1]; Deronzier, A; Moutet, J C ^[2]

---

1. Univ. of North Carolina, Chapel Hill (USA)
2. Universite Joseph Fourier, Saint Martin d'Heres (France)

Thin films of polymers consisting of mixtures of poly(N,N-bis(3-pyrrol-1-ylpropyl)-4,4{prime}-bipyridinium) dication (poly-(pyr){sub 2}-PQ{sup 2+}) and poly(tris(4-(2-pyrrol-1-ylethyl)-4{prime}-methyl-2,2{prime}-bipyridine)ruthenium(II)) dication, poly-(pyr){sub 3}-(Ru){sup 2+} have been prepared by co-oxidative electropolymerization of the corresponding pyrrole-containing monomers. Significant photocurrents are observed when the films are photolyzed in the presence of the irreversible electron-transfer donor, triethanolamine (TEOA). The initial step in the photocurrent mechanism is static, oxidative quenching of the metal to ligand charge transfer (MLCT) excited states of the ruthenium complex by poly-(pyr){sub 2}-PQ{sup 2+}. This gives poly-(pyr){sub 2}-PQ{sup +} and poly-(pyr){sub 3}-(Ru){sup 3+}. The photoproduced {minus}(Ru){sup 3+} is subsequently reduced by TEOA. The photocurrent arises by electron transfer to the electrode at the inside via the poly-(pyr){sub 2}-PQ{sup 2+/+} couple. A kinetic model has been derived which explains variations in the photocurrent with light intensity and (TEOA).

• OSTI ID: 6187638
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:17; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AZOLES
CALCULATION METHODS
CURRENTS
ELECTRIC CURRENTS
ELECTROCHEMICAL CELLS
ELECTRON TRANSFER
FILMS
HETEROCYCLIC COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PHOTOCURRENTS
POLYMERS
PYRROLES
REACTION KINETICS
THIN FILMS