New Fluorescent Model Compounds for the Study of Photoinduced Electron Transfer: The Influence of a Molecular Electric Field in the Excited State

Authors

  • Dr. A. Prasanna de Silva,

    Corresponding author
    1. School of Chemistry, Queen's University, Belfast BT9 5AG (Northern Ireland). Telefax: Int. code + (1232)382117
    • School of Chemistry, Queen's University, Belfast BT9 5AG (Northern Ireland). Telefax: Int. code + (1232)382117
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  • Dr. H. Q. Nimal Gunaratne,

    1. School of Chemistry, Queen's University, Belfast BT9 5AG (Northern Ireland). Telefax: Int. code + (1232)382117
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  • Dr. Jean-Louis Habib-Jiwan,

    1. Laboratoire de Chimie Organique Physique et de Photochimie, Université Catholique de Louvain, B-1348 Louvain-la-Neuve (Belgium). Telefax: Int. code + (10)472989
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  • Dr. Colin P. McCoy,

    1. School of Chemistry, Queen's University, Belfast BT9 5AG (Northern Ireland). Telefax: Int. code + (1232)382117
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  • Terence E. Rice,

    1. School of Chemistry, Queen's University, Belfast BT9 5AG (Northern Ireland). Telefax: Int. code + (1232)382117
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  • Prof. Jean-Philippe Soumillion

    1. Laboratoire de Chimie Organique Physique et de Photochimie, Université Catholique de Louvain, B-1348 Louvain-la-Neuve (Belgium). Telefax: Int. code + (10)472989
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  • This work was supported by the following organizations: NATO (grant no. 921408), SERC/EPSRC (UK), FNRS (Belgium), Department of Education in Northern Ireland, and The Nuffield Foundation (UK). We thank Dr. P. L. M. Lynch for support and help.

Abstract

original image

The location of the “spacer–receptor” unit in a 4-aminonaphthalimide fluorophore, which undergoes internal charge transfer in the excited state, is crucial for the suitability of the compound as a pH sensor. In studies of the pH dependence of the fluorescence of the regioisomers 1 and 2, only 1 displayed desirable properties.

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