CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES
The dimerization of the diamide of zinc‐tetracarboxyphthalocyanine was studied spectro‐scopically in hexadecyltrimethylammonium bromide (CTAB) micelles at surfactant concentrations from 0.026 to 0.1 M and dye concentrations between 0.1 and 10 μM. The apparent dimerization constant in CTAB 0.1 M is 8...
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1991
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318655_v54_n3_p367_Daraio http://hdl.handle.net/20.500.12110/paper_00318655_v54_n3_p367_Daraio |
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paper:paper_00318655_v54_n3_p367_Daraio2023-06-08T14:57:15Z CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES Daraio, Marta Edit Aramendía, Pedro Francisco San Roman, Enrique Arnoldo Braslavsky, Silvia Elsa cetrimide indole derivative organometallic compound oxygen singlet oxygen zinc zinc tetracarboxyphthalocyanine article chemistry micelle photochemistry spectrophotometry Cetrimonium Compounds Indoles Micelles Organometallic Compounds Oxygen Photochemistry Singlet Oxygen Spectrophotometry Support, Non-U.S. Gov't Zinc The dimerization of the diamide of zinc‐tetracarboxyphthalocyanine was studied spectro‐scopically in hexadecyltrimethylammonium bromide (CTAB) micelles at surfactant concentrations from 0.026 to 0.1 M and dye concentrations between 0.1 and 10 μM. The apparent dimerization constant in CTAB 0.1 M is 8.6 × 105M−1, while the intramicellar dimerization constant is 1.8 × 103. The dimer absorption spectrum was also obtained. Singlet molecular oxygen sensitization was studied by steady state photolysis using 1,3‐diphenylisobenzofurane as scavenger in 0.1 M CTAB. The usual sensitization mechanism is extended to include dimer reactions. Singlet molecular oxygen sensitization yields for monomer and dimer in the micelles are 0.7 and 0.1, respectively. With the reported values it is possible to calculate the average yield of singlet molecular oxygen production at any surfactant and dye concentrations. Copyright © 1991, Wiley Blackwell. All rights reserved Fil:Daraio, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aramendía, P.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Braslavsky, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318655_v54_n3_p367_Daraio http://hdl.handle.net/20.500.12110/paper_00318655_v54_n3_p367_Daraio |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
cetrimide indole derivative organometallic compound oxygen singlet oxygen zinc zinc tetracarboxyphthalocyanine article chemistry micelle photochemistry spectrophotometry Cetrimonium Compounds Indoles Micelles Organometallic Compounds Oxygen Photochemistry Singlet Oxygen Spectrophotometry Support, Non-U.S. Gov't Zinc |
| spellingShingle |
cetrimide indole derivative organometallic compound oxygen singlet oxygen zinc zinc tetracarboxyphthalocyanine article chemistry micelle photochemistry spectrophotometry Cetrimonium Compounds Indoles Micelles Organometallic Compounds Oxygen Photochemistry Singlet Oxygen Spectrophotometry Support, Non-U.S. Gov't Zinc Daraio, Marta Edit Aramendía, Pedro Francisco San Roman, Enrique Arnoldo Braslavsky, Silvia Elsa CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| topic_facet |
cetrimide indole derivative organometallic compound oxygen singlet oxygen zinc zinc tetracarboxyphthalocyanine article chemistry micelle photochemistry spectrophotometry Cetrimonium Compounds Indoles Micelles Organometallic Compounds Oxygen Photochemistry Singlet Oxygen Spectrophotometry Support, Non-U.S. Gov't Zinc |
| description |
The dimerization of the diamide of zinc‐tetracarboxyphthalocyanine was studied spectro‐scopically in hexadecyltrimethylammonium bromide (CTAB) micelles at surfactant concentrations from 0.026 to 0.1 M and dye concentrations between 0.1 and 10 μM. The apparent dimerization constant in CTAB 0.1 M is 8.6 × 105M−1, while the intramicellar dimerization constant is 1.8 × 103. The dimer absorption spectrum was also obtained. Singlet molecular oxygen sensitization was studied by steady state photolysis using 1,3‐diphenylisobenzofurane as scavenger in 0.1 M CTAB. The usual sensitization mechanism is extended to include dimer reactions. Singlet molecular oxygen sensitization yields for monomer and dimer in the micelles are 0.7 and 0.1, respectively. With the reported values it is possible to calculate the average yield of singlet molecular oxygen production at any surfactant and dye concentrations. Copyright © 1991, Wiley Blackwell. All rights reserved |
| author |
Daraio, Marta Edit Aramendía, Pedro Francisco San Roman, Enrique Arnoldo Braslavsky, Silvia Elsa |
| author_facet |
Daraio, Marta Edit Aramendía, Pedro Francisco San Roman, Enrique Arnoldo Braslavsky, Silvia Elsa |
| author_sort |
Daraio, Marta Edit |
| title |
CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| title_short |
CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| title_full |
CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| title_fullStr |
CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| title_full_unstemmed |
CARBOXYLATED ZINC‐PHTHALOCYANINES–II DIMERIZATION AND SINGLET MOLECULAR OXYGEN SENSITIZATION IN HEXADECYLTRIMETHYLAMMONIUM BROMIDE MICELLES |
| title_sort |
carboxylated zinc‐phthalocyanines–ii dimerization and singlet molecular oxygen sensitization in hexadecyltrimethylammonium bromide micelles |
| publishDate |
1991 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318655_v54_n3_p367_Daraio http://hdl.handle.net/20.500.12110/paper_00318655_v54_n3_p367_Daraio |
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| _version_ |
1768545636923211776 |