QUENCHING STUDIES OF *Cu(dpp)//2** plus . EVIDENCE FOR COMPETITIVE ELECTRON-TRANSFER AND ENERGY-TRANSFER QUENCHING BY Cr(acac)//3 DERIVATIVES.

Roland E. Gamache, Rosemary A. Rader, David R. McMillin

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

The kinetics of quenching *Cu(dpp)//2** plus , the **3d minus pi * excited state of Cu(dpp)//2** plus (dpp equals 2,9-diphenyl-1,10-phenanthroline), by a series of Cr(acac)//3 derivatives and a series of nitroaromatics have been studied in CH//2Cl//2 solution at 20 degree C. For the nitroaromatic compounds, the quenching rate falls off as the electrode potential of the quencher ranges below that of *Cu(dpp)//2** plus , consistent with an electron-transfer mechanism. The results are analyzed by a variation of the Marcus theory, and the self-exchange rate for the Cu(dpp)//2**2** plus /*Cu(dpp)//2** plus system was estimated to be 8 multiplied by 10**9 M** minus **1 s** minus **1. The Cr(III) quenchers span a much wider range of electrode potentials and are also capable of undergoing energy-transfer quenching via the low-lying doublet excited states.

Original languageEnglish (US)
Pages (from-to)1141-1146
Number of pages6
JournalJournal of the American Chemical Society
Volume107
Issue number5
StatePublished - Mar 6 1985
Externally publishedYes

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Energy Transfer
Energy transfer
Quenching
Electrodes
Electrons
Excited states
Derivatives
Kinetics
tris(acetylacetonato)chroum(III)
diphenyl
1,10-phenanthroline

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

QUENCHING STUDIES OF *Cu(dpp)//2** plus . EVIDENCE FOR COMPETITIVE ELECTRON-TRANSFER AND ENERGY-TRANSFER QUENCHING BY Cr(acac)//3 DERIVATIVES. / Gamache, Roland E.; Rader, Rosemary A.; McMillin, David R.

In: Journal of the American Chemical Society, Vol. 107, No. 5, 06.03.1985, p. 1141-1146.

Research output: Contribution to journalArticle

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abstract = "The kinetics of quenching *Cu(dpp)//2** plus , the **3d minus pi * excited state of Cu(dpp)//2** plus (dpp equals 2,9-diphenyl-1,10-phenanthroline), by a series of Cr(acac)//3 derivatives and a series of nitroaromatics have been studied in CH//2Cl//2 solution at 20 degree C. For the nitroaromatic compounds, the quenching rate falls off as the electrode potential of the quencher ranges below that of *Cu(dpp)//2** plus , consistent with an electron-transfer mechanism. The results are analyzed by a variation of the Marcus theory, and the self-exchange rate for the Cu(dpp)//2**2** plus /*Cu(dpp)//2** plus system was estimated to be 8 multiplied by 10**9 M** minus **1 s** minus **1. The Cr(III) quenchers span a much wider range of electrode potentials and are also capable of undergoing energy-transfer quenching via the low-lying doublet excited states.",
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