Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines

The UV-visible spectra of copper(II) tetracarboxyphthalocyanine (CuTCPc), copper(II) tetrapentyloxycarbonyl- phthalocyanine (CuTPOCPc) and hydroxyaluminium tricarboxymonoamidephthalocyanine (AlTCPc) were studied as a function of concentration in various solvents. Dye aggregation equilibria were inve...

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Autores principales: Gabriela Lagorio, M., Dicelio, L.E., San Román, E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10106030_v72_n2_p153_GabrielaLagorio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10106030_v72_n2_p153_GabrielaLagorio2023-10-03T15:56:03Z Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines Gabriela Lagorio, M. Dicelio, L.E. San Román, E. The UV-visible spectra of copper(II) tetracarboxyphthalocyanine (CuTCPc), copper(II) tetrapentyloxycarbonyl- phthalocyanine (CuTPOCPc) and hydroxyaluminium tricarboxymonoamidephthalocyanine (AlTCPc) were studied as a function of concentration in various solvents. Dye aggregation equilibria were investigated and pure monomet and dimer spectra were obtained. Near-IR absorption maxima for the above compounds and for cobalt(II) dicarboxydiamidephthalocyanine (Co(II)TCPc) and dicyanocobalt(III) dicarboxydiamidephthalocyanine (Co(III)TCPc) were also obtained and their assignment to triplet-multiplet transitions is discussed. The analysis of the monomer and dimer spectra on the basis of exciton theory and results obtained from molecular mechanics computational calculations allows conclusions to be drawn on the monomer and dimer structures and observed differences in aggregation ability to be interpreted. Quantum yields of singlet molecular oxygen photoproduction by monomers and dimers were determined for aluminium and copper dyes by steady state irradiation using diphenylisobenzofuran as singlet oxygen quencher. The lack of activity in dimers, in accordance with the literature available, is interpreted in terms of the vibronic coupling between monomeric units in the dimer (exciton theory). © 1993. Fil:Gabriela Lagorio, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dicelio, L.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10106030_v72_n2_p153_GabrielaLagorio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The UV-visible spectra of copper(II) tetracarboxyphthalocyanine (CuTCPc), copper(II) tetrapentyloxycarbonyl- phthalocyanine (CuTPOCPc) and hydroxyaluminium tricarboxymonoamidephthalocyanine (AlTCPc) were studied as a function of concentration in various solvents. Dye aggregation equilibria were investigated and pure monomet and dimer spectra were obtained. Near-IR absorption maxima for the above compounds and for cobalt(II) dicarboxydiamidephthalocyanine (Co(II)TCPc) and dicyanocobalt(III) dicarboxydiamidephthalocyanine (Co(III)TCPc) were also obtained and their assignment to triplet-multiplet transitions is discussed. The analysis of the monomer and dimer spectra on the basis of exciton theory and results obtained from molecular mechanics computational calculations allows conclusions to be drawn on the monomer and dimer structures and observed differences in aggregation ability to be interpreted. Quantum yields of singlet molecular oxygen photoproduction by monomers and dimers were determined for aluminium and copper dyes by steady state irradiation using diphenylisobenzofuran as singlet oxygen quencher. The lack of activity in dimers, in accordance with the literature available, is interpreted in terms of the vibronic coupling between monomeric units in the dimer (exciton theory). © 1993.
format JOUR
author Gabriela Lagorio, M.
Dicelio, L.E.
San Román, E.
spellingShingle Gabriela Lagorio, M.
Dicelio, L.E.
San Román, E.
Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
author_facet Gabriela Lagorio, M.
Dicelio, L.E.
San Román, E.
author_sort Gabriela Lagorio, M.
title Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
title_short Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
title_full Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
title_fullStr Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
title_full_unstemmed Visible and near-IR spectroscopic and photochemical characterization of substituted metallophthalocyanines
title_sort visible and near-ir spectroscopic and photochemical characterization of substituted metallophthalocyanines
url http://hdl.handle.net/20.500.12110/paper_10106030_v72_n2_p153_GabrielaLagorio
work_keys_str_mv AT gabrielalagoriom visibleandnearirspectroscopicandphotochemicalcharacterizationofsubstitutedmetallophthalocyanines
AT diceliole visibleandnearirspectroscopicandphotochemicalcharacterizationofsubstitutedmetallophthalocyanines
AT sanromane visibleandnearirspectroscopicandphotochemicalcharacterizationofsubstitutedmetallophthalocyanines
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