TY - JOUR
T1 - Excited Triplet States in Aggregates and Monomers of Water Soluble Meso-Aryl Substituted Porphyrins
AU - García-Ortega, Hector
AU - Bourdelande, José L.
AU - Crusats, Joaquim
AU - El-Hachemi, Zoubir
AU - Ribó, Josep M.
PY - 2004/4/15
Y1 - 2004/4/15
N2 - The excited triplet states of a set of water-soluble 4-sulfonatophenyl meso-bis and meso-tetrakis substituted porphyrinoids were studied in a wide range of concentrations. All of these porphyrinoids show the formation of π-stacked aggregates (H aggregates). As a consequence of the 5,15-diaryl substitution, and of aggregation, two excited triplet states can be detected, the more stable being accessible only by internal conversion of the current excited-state T 1. The aggregates showed a significant singlet oxygen quantum yield [ 1O 2 ( 1δ g), determined by the phosphorescence method], which in most cases was of the same order as the monomeric forms.
AB - The excited triplet states of a set of water-soluble 4-sulfonatophenyl meso-bis and meso-tetrakis substituted porphyrinoids were studied in a wide range of concentrations. All of these porphyrinoids show the formation of π-stacked aggregates (H aggregates). As a consequence of the 5,15-diaryl substitution, and of aggregation, two excited triplet states can be detected, the more stable being accessible only by internal conversion of the current excited-state T 1. The aggregates showed a significant singlet oxygen quantum yield [ 1O 2 ( 1δ g), determined by the phosphorescence method], which in most cases was of the same order as the monomeric forms.
M3 - Article
VL - 108
SP - 4631
EP - 4639
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 15
ER -