Methylthio BODIPY as a standard triplet photosensitizer for singlet oxygen production: a photophysical study - Archive ouverte HAL Access content directly
Journal Articles Physical Chemistry Chemical Physics Year : 2019

Methylthio BODIPY as a standard triplet photosensitizer for singlet oxygen production: a photophysical study

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1
Ruth Prieto-Montero
  • Function : Author
Rebeca Sola-Llano
  • Function : Author
Raul Montero
  • Function : Author
Asier Longarte
  • Function : Author
Teresa Arbeloa
  • Function : Author
Iñigo López-Arbeloa
  • Function : Author
Virginia Martínez-Martínez
  • Function : Correspondent author
  • PersonId : 1053689

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Abstract

A complete photophysical study on the iodinated-BODIPY, 3,5-dimethyl-2,6-diiodo-8-thiomethyl-pyrromethene (MeSBDP), demonstrated that it is an excellent triplet photosensitizer for singlet oxygen production in a broad range of apolar and polar solvents. Besides its absorption and fluorescence emission spectra, the dynamics of its excited states including its intersystem crossing rate was characterized by femtosecond transient experiments. The photophysical study of its triplet state by nanosecond transient absorption spectroscopy and phosphorescence emission concluded to a diffusion-controlled quenching of 3MeSBDP by O2 and to a fraction of triplet state quenching by O2 Image ID:c9cp03454d-t1.gif close to unity. The high (>0.87) and solvent-insensitive singlet oxygen quantum yield ϕΔ measured by singlet oxygen phosphorescence emission, together with the noticeable photostability of MeSBSP, as well as the absence of quenching of singlet oxygen by MeSBDP itself, allows claiming it as an alternative standard photosensitizer for singlet oxygen production, under excitation either in the UV or in the visible range.
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Dates and versions

hal-02282804 , version 1 (10-09-2019)

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Ruth Prieto-Montero, Rebeca Sola-Llano, Raul Montero, Asier Longarte, Teresa Arbeloa, et al.. Methylthio BODIPY as a standard triplet photosensitizer for singlet oxygen production: a photophysical study. Physical Chemistry Chemical Physics, 2019, ⟨10.1039/C9CP03454D⟩. ⟨hal-02282804⟩
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