Optical properties of free base tetrasulfonatofenil porphyrin (H2TPPS4), and tetrapyridyl porphyrin (H2TPyP) with ruthenium group

ORAL

Abstract

Recently we proposed new insight to the absorption and fluorescence (FL) of free base tetrapyridyl porphyrin (H2TPyP). In this project, we extend our study to the free base tetrasulfonatofenil porphyrin (H2TPPS4), and to supramolecular structure composed by H2TPyP and four ruthenium groups ([RuCl(terpy)(PPh3)2]PF6). Despite the fact that literature has reported the transitions observed in porphyrins’ absorption and fluorescence spectra, a more accurate interpretation has been evasive and still needed for H2TPPS4 and [RuCl(terpy)(PPh3)2]PF6 systems. We found that these systems follow our recent findings for H2TPyP where each of the absorption Q-bands consist of two quasi-degenerated bands namely Qx1, Qx2 and Qy1, Qy2, respectively. We also explore the FL and its polarization degree (polarization components) via the Stokes spectroscopy method. Using the Stokes method, we found that the FL polarization degree depends on the concentration of the molecules in the solvent. In order to elucidate the polarization mechanisms, further investigations are being conducted via polarization-resolved, temperature-dependent and lifetime spectroscopy experiments.

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Presenters

  • Ehsan Zolghadr

    University of Alabama

Authors

  • Ehsan Zolghadr

    University of Alabama

  • Keshav Sharma

    Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, United States, University of Alabama

  • Jefferson Marcio Sanches Lopes

    Graduate Program in Physics, Federal University of Para, Belem, PA, Brazil, Federal University of Pará

  • Renato Neiva Sampaio

    Department of Chemistry, The University of North Carolina at Chapel Hill, Murray Hall, Chapel Hill, NC, United States, University of North Carolina at Chapel Hill

  • Alzir Azevedo Batista

    Department of Chemistry, Federal University of Sao Carlos, Sao Carlos, SP, Brazil, Federal University of São Carlos

  • Amando Siuiti Ito

    College of Philosophy, Sciences, and Letters of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, SP, Brazil., University of São Paulo

  • Newton M Barbosa Neto

    Graduate Program in Physics, Federal University of Para, Belem, PA, Brazil, Federal University of Pará, Instituto de Ciências Exatas e Naturais – Programa de Pós-graduação em Física, Universidade Federal do Pará, Belém PA 66075-110, Brazil

  • Paulo T Araujo

    Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, United States, University of Alabama, Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, Alabama 35487, USA