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Influence of the meso-substituents on the spectral features of free-base porphyrin.
Lopes, J M S; Reis, J R T; Machado, A E H; Leite, T H O; Batista, A A; Acunha, T V; Iglesias, B A; Araujo, P T; Barbosa Neto, N M.
Afiliación
  • Lopes JMS; Institute of Natural Sciences, Graduate Program in Physics, Federal University of Pará, Belém, PA, Brazil. Electronic address: jefferson.lopes@icen.ufpa.br.
  • Reis JRT; Institute of Natural Sciences, Graduate Program in Physics, Federal University of Pará, Belém, PA, Brazil.
  • Machado AEH; Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil; Federal University of Catalão, Av. Lamartine Pinto de Avelar, 1120, CEP 75704-020, Catalão, GO, Brazil.
  • Leite THO; Department of Chemistry, Federal University of São Carlos, São Carlos, SP, Brazil.
  • Batista AA; Department of Chemistry, Federal University of São Carlos, São Carlos, SP, Brazil.
  • Acunha TV; Bioinorganic and Porphyrinoid Materials Laboratory, Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil.
  • Iglesias BA; Bioinorganic and Porphyrinoid Materials Laboratory, Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil.
  • Araujo PT; Institute of Natural Sciences, Graduate Program in Physics, Federal University of Pará, Belém, PA, Brazil; Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, United States. Electronic address: paulo.t.araujo@ua.edu.
  • Barbosa Neto NM; Institute of Natural Sciences, Graduate Program in Physics, Federal University of Pará, Belém, PA, Brazil. Electronic address: barbosaneto@ufpa.br.
Spectrochim Acta A Mol Biomol Spectrosc ; 238: 118389, 2020 Sep 05.
Article en En | MEDLINE | ID: mdl-32417643
The role of meso-substituents on the spectral features of free-base porphyrins is explored. Meso-tetra(4-pyridyl)porphyrin is compared with meso-tetra(2-thienyl)porphyrin and meso-tetra(pentafluorophenyl)porphyrin. Our results indicate that some of the asymmetric Q-bands in the free-base porphyrin tend to become symmetric relative to the adopted meso-substituent. The results show that the outlying perturbations lead the free-base quasi-degenerated Qx1, Qx2, Qy1, and Qy2 bands to be closer in energy. Combined, absorption, fluorescence and Raman spectroscopies endorse our conclusions showing that both the frequencies and the Huang-Rhys factors associated with every vibronic progression are noticeably affected by the investigated meso-substituents. Our results confirm that the B-band is also multi-featured in agreement with what is found for the Q-bands.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Spectrochim Acta A Mol Biomol Spectrosc Asunto de la revista: BIOLOGIA MOLECULAR Año: 2020 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Spectrochim Acta A Mol Biomol Spectrosc Asunto de la revista: BIOLOGIA MOLECULAR Año: 2020 Tipo del documento: Article Pais de publicación: Reino Unido