Excited Triplet States in Aggregates and Monomers of Water Soluble Meso-Aryl Substituted Porphyrins

Hector García-Ortega; José L. Bourdelande; Joaquim Crusats; Zoubir El-Hachemi; Josep M. Ribó

Excited Triplet States in Aggregates and Monomers of Water Soluble Meso-Aryl Substituted Porphyrins

Hector García-Ortega, José L. Bourdelande, Joaquim Crusats, Zoubir El-Hachemi, Josep M. Ribó

Department of Chemistry

Research output: Contribution to journal › Article › Research › peer-review

18 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	4631-4639
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	15
Publication status	Published - 15 Apr 2004

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title = "Excited Triplet States in Aggregates and Monomers of Water Soluble Meso-Aryl Substituted Porphyrins",

abstract = "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.",

author = "Hector Garc{\'i}a-Ortega and Bourdelande, {Jos{\'e} L.} and Joaquim Crusats and Zoubir El-Hachemi and Rib{\'o}, {Josep M.}",

year = "2004",

month = apr,

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language = "English",

volume = "108",

pages = "4631--4639",

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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

IS - 15

ER -