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Static and Dynamic Bimolecular Fluorescence Quenching of Porphyrin Dendrimers in Solution

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Abstract

The fluorescence quenching kinetics of two porphyrin dendrimer series (GnTPPH2 and GnPZn) by different type of quenchers is reported. The microenvironment surrounding the core in GnPZn was probing by core-quencher interactions using benzimidazole. The dependence of quencher binding constant (K a ) on generation indicates the presence of a weak interaction between branches and the core of the porphyrin dendrimer. The similar free volume in dendrimers of third and fourth generation suggests that structural collapse in high generations occurs by packing of the dendrimer peripheral layer. Dynamic fluorescence quenching of the porphyrin core by 1,3-dicyanomethylene-2-methyl-2-pentyl-indan (PDCMI) in GnTPPH2 is a distance dependent electron transfer process with an exponential attenuation factor β = 0.33 Å−1. The quenching by 1,2-dibromobenzene occurs by diffusion process of the quencher toward to the porphyrin core, and its rate constant is practically independent of dendrimer generation.

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Acknowledgments

The authors thank Professor J. M. J. Fréchet for the dendrimer samples, and Professor F. C. De Schryver for helpful discussion. MSM and MHG thank FAPESP and CNPq for financial support.

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Authors and Affiliations

  1. Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Sao Paulo, Brazil

    Mauricio S. Matos

  2. Department of Chemistry, Katholieke Universiteit Leuven, Louvain, Belgium

    Johan Hofkens

  3. Instituto de Química de São Carlos, Universidade de São Paulo, 13560-970, São Carlos, SP, Brazil

    Marcelo H. Gehlen

Authors
  1. Mauricio S. Matos
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  2. Johan Hofkens
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  3. Marcelo H. Gehlen
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Correspondence to Marcelo H. Gehlen.

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Matos, M.S., Hofkens, J. & Gehlen, M.H. Static and Dynamic Bimolecular Fluorescence Quenching of Porphyrin Dendrimers in Solution. J Fluoresc 18, 821–826 (2008). https://doi.org/10.1007/s10895-007-0309-7

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  • DOI: https://doi.org/10.1007/s10895-007-0309-7

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