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Issue 15, 2014
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An exemplary relationship between the extent of cofacial aggregation and fluorescence quantum yield as exhibited by quaternized amphiphilic phthalocyanines

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Abstract

The aggregation equilibrium of a series of positively-charged water-soluble phthalocyanines (Pcs) was studied in aqueous solution by means of absorption and fluorescence techniques. The aggregation equilibrium in water depends on the bridging atoms between the pyridyl groups and the Pc core, and on the central metal of the Pcs, while N-alkyl groups are virtually uninvolved in the aggregation properties. Thus, in the water–methanol mixture, the aggregation tendency increased in the order of Zn < Cu ≤ Ni, Pd when the ligand is the same, while the bridging element sulfur gives much more propensity for aggregation compared to oxygen. The fluorescence quantum yields of the Pcs showed an excellent correlation with the extent of aggregation.

Graphical abstract: An exemplary relationship between the extent of cofacial aggregation and fluorescence quantum yield as exhibited by quaternized amphiphilic phthalocyanines

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Publication details

The article was received on 20 Jan 2014, accepted on 29 Jan 2014 and first published on 30 Jan 2014


Article type: Paper
DOI: 10.1039/C4DT00195H
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 5886-5892
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    An exemplary relationship between the extent of cofacial aggregation and fluorescence quantum yield as exhibited by quaternized amphiphilic phthalocyanines

    T. Teixeira Tasso, Y. Yamasaki, T. Furuyama and N. Kobayashi, Dalton Trans., 2014, 43, 5886
    DOI: 10.1039/C4DT00195H

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