Tuning the Singlet Oxygen Quantum Yield of Near-IR-absorbing Porphyrazines

Sangwan Lee, Robert Stackow, Christopher S. Foote, Anthony G.M. Barrett, Brian M. Hoffman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We report the quantum yields for singlet oxygen production by a series of porphyrazines (pz) of the form M[pz(An; B4-n)] (Scheme 1), where the peripheral substituent A is [S-R]2 with R = (CH 2CH2O)3H, B is a fused αα′ -dialkoxybenzo group and M = 2H, Mg or Zn. These compounds show intense near-IR absorbance/emission (longest wavelength emission, ∼830 nm). Their solubilities vary with R, whereas their optical properties do not. We show that singlet oxygen sensitization by these luminescent compounds can be "tuned" from essentially off to on by varying n and selection among M = 2H, Mg or Zn. The quantum yields vary ca 60-fold within the set of compounds studied, from ψΔ = 0.007 for compound 3 to ψ Δ = ∼0.4 for compound 11.

Original languageEnglish (US)
Pages (from-to)18-21
Number of pages4
JournalPhotochemistry and Photobiology
Volume77
Issue number1
DOIs
StatePublished - Jan 2003

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

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