Photoeffects in thin-film molecular-level chromophore-quencher assemblies. 1. Physical characterization

Nigel A. Surridge, Stephen F. McClanahan, Joseph T Hupp, Earl Danielson, Sharon Gould, Thomas J. Meyer

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Molecular-level chromophore-quencher assemblies have been prepared in precast chlorosulfonated polystyrene ([-CH2CH(p-C6H4SO2Cl)]x-; PS-SO2Cl) films by (1) exposing the intact film to solutions containing the chromophore [(bpy)2Ru(5-NH2Phen)][PF6]2 (bpy is 2,2′-bipyridine; 5-NH2phen is 5-amino-1,10-phenanthroline) which becomes chemically bound through sulfonamide bond formation, (2) partially hydrolyzing a portion of the remaining -SO2Cl sites to -SO3- sites and exposing the resulting films to acetonitrile solutions containing the electron-transfer quencher paraquat (PQ2+) and the reductive scavenger triethanolamine (N(C2H4OH)3). The photophysical properties of the chromophore-based metal-to-ligand charge-transfer excited state have been investigated by lifetime and visible absorption and emission spectra. Although similar to related monomers, excited-state decay in the films is nonexponential. The dynamics of excited-state quenching by PQ2+ following pulsed laser excitation show that the chromophore occupies three different chemical sites within the films. At one site, which accounts for ∼50% of the emitted light and appears to be located near ion channels created by hydrolysis, quenching is rapid, KSV ∼ 6.8 × 104 M-1. A second site exists that undergoes relatively slow quenching, KSV ∼ 3 × 103 M-1, and then only with added [NEt4](ClO4). A third site is present that is not quenched.

Original languageEnglish
Pages (from-to)294-304
Number of pages11
JournalJournal of Physical Chemistry
Volume93
Issue number1
Publication statusPublished - 1989

Fingerprint

Chromophores
assemblies
chromophores
Thin films
Excited states
thin films
excitation
Quenching
quenching
Rapid quenching
Triethanolamine
Paraquat
Laser excitation
Polystyrenes
Sulfonamides
visible spectrum
Acetonitrile
Pulsed lasers
Ion Channels
acetonitrile

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Surridge, N. A., McClanahan, S. F., Hupp, J. T., Danielson, E., Gould, S., & Meyer, T. J. (1989). Photoeffects in thin-film molecular-level chromophore-quencher assemblies. 1. Physical characterization. Journal of Physical Chemistry, 93(1), 294-304.

Photoeffects in thin-film molecular-level chromophore-quencher assemblies. 1. Physical characterization. / Surridge, Nigel A.; McClanahan, Stephen F.; Hupp, Joseph T; Danielson, Earl; Gould, Sharon; Meyer, Thomas J.

In: Journal of Physical Chemistry, Vol. 93, No. 1, 1989, p. 294-304.

Research output: Contribution to journalArticle

Surridge, NA, McClanahan, SF, Hupp, JT, Danielson, E, Gould, S & Meyer, TJ 1989, 'Photoeffects in thin-film molecular-level chromophore-quencher assemblies. 1. Physical characterization', Journal of Physical Chemistry, vol. 93, no. 1, pp. 294-304.
Surridge, Nigel A. ; McClanahan, Stephen F. ; Hupp, Joseph T ; Danielson, Earl ; Gould, Sharon ; Meyer, Thomas J. / Photoeffects in thin-film molecular-level chromophore-quencher assemblies. 1. Physical characterization. In: Journal of Physical Chemistry. 1989 ; Vol. 93, No. 1. pp. 294-304.
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