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Luminescence of porphyrins and metalloporphyrins VII: Luminescence of phosphorus tetraphenylporphyrins

Authors
Journal
Journal of Photochemistry
0047-2670
Publisher
Elsevier
Publication Date
Volume
23
Issue
1
Identifiers
DOI: 10.1016/0047-2670(83)80074-4
Disciplines
  • Physics

Abstract

Abstract The absorption, fluorescence and low temperature phosphorescence spectra of phosphorus(V) tetraphenylporphine (P VTPP) appear to be quite normal for a diamagnetic porphyrin although both the fluorescence and phosphorescence quantum yields are low (φ F = 0.059 and φ P = 5 × 10 −4). Internal conversion from the first excited singlet to the ground state occurs with a quantum yield of about 0.14 and the triplet lifetime at 77 and 300 K appears shorter than that predicted from the spin-orbital coupling properties of the compound. It is proposed that ion pairing between the cationic P VTPP and a perchlorate counter-ion provides a route for non-radiative deactivation of the excited triplet state, although there is no direct evidence to support this idea. The unstable P IIITPP possesses a hyperabsorption spectrum, but no luminescence attributable to the compound could be observed at 77 or 300 K.

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