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1 May 2005 Characterization of Photoproducts of m-THPP in Aqueous Solution
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Abstract

This study examined the nature of photoproducts after pulse laser irradiation (647.5 nm) of 5,10,15,20-tetrakis(meso-hydroxyphenyl)porphyrin (m-THPP) (10 μmol/L) in ethanol-water (1/99, vol/vol) solution. Spectroscopic measurements (UV-visible absorption and fluorescence) and mass spectrometry techniques (matrix-assisted laser desorption-ionization [MALDI] coupled with time-of-flight mass spectrometer [TOF-MS] or tandem time of flight mass spectrometer [TOF/TOF-MS]) were used to follow photomodifications. Spectroscopic measurements evidenced photomodification as the main process after m-THPP irradiation. Three oxidized photoproducts at m/z 693.25, 695.24 and 713.25 were characterized by MS. After prolonged irradiation new isotopic distributions were registered at m/z 1355.41, 2031.57, 2707.80 and 3383.98 with MALDI-TOF-MS and TOF/TOF-MS. These new photoproducts were attributed to covalent oligomeric structures as dimer, trimer, tetramer and pentamer of m-THPP.

Natacha Lourette, Benoît Maunit, Lina Bezdetnaya, Henri-Pierre Lassalle, François Guillemin, and Jean-François Muller "Characterization of Photoproducts of m-THPP in Aqueous Solution," Photochemistry and Photobiology 81(3), 691-696, (1 May 2005). https://doi.org/10.1562/2004-06-09-RA-190.1
Received: 9 June 2005; Accepted: 1 January 2005; Published: 1 May 2005
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