Peculiar photoinduced properties of water-soluble, early lanthanide(III) porphyrins

Muhammad Imran, Csanád Szentgyörgyi, Gábor Eller, Zsolt Valicsek, Ottó Horváth

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Water-soluble, early lanthanide(III) mono- and bisporphyrin complexes possess very similar UV-Vis absorption as well as photophysical and photochemical properties, as a consequence of a special type of aggregation, through the peripheral substituents. In the absence of the bidentate, O-donor acetate ligand, bisporphyrin can form too, which has slightly redshifted and broadened absorption bands, compared to those of the monoporphyrin. Also the bisporphyrin displays a blueshifted and less intense fluorescence, related to the free-base porphyrin. The formation of complexes and the transformation between the mono- and bisporphyrins are very slow reactions in dark at room temperature. These reactions are accelerated by the photolysis of the system, which are considerable by-processes of the photoredox degradation. Depending on the wavelength of irradiation, two types of photoproducts can appear: during the photolysis at the Soret-band, a radical type intermediate can be observed, which disappears in dark. However, during the irradiation at the Q-bands, a new photoproduct appears, which is stable in dark and undetectable in the case of post-transition metal ions' out-of-plane porphyrin complexes.

Original languageEnglish
Pages (from-to)60-63
Number of pages4
JournalInorganic Chemistry Communications
Volume52
DOIs
Publication statusPublished - Feb 2015

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Keywords

  • Charge separation
  • Early lanthanide(III) ions
  • LMCT
  • Out-of-plane metalloporphyrins
  • Tail-to-tail oligomerization
  • Water cleavage

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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