Microenvironment-switchable singlet oxygen generation by axially-coordinated hydrophilic ruthenium phthalocyanine dendrimers

Uwe Hahn, Francesca Setaro, Xavier Ragàs, Angus Gray-Weale, Santi Nonell, Tomas Torres

Producció científica: Article en revista indexadaArticleAvaluat per experts

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Resum

A series of new metallodendrimers built around a ruthenium phthalocyanine core has been prepared. Employing a convergent synthetic strategy, pyridine-containing ligands were prepared and then assembled onto the ruthenium phthalocyanine through axial ligand coordination. The growing shell of oligoethylene glycol chains surrounding the lipophilic core allows solubilisation in water. Photophysical studies show that all the metallodendrimers are strongly phosphorescent and the deactivation pathway of their triplet state depends on the medium in which the compounds are dissolved. On one hand, quenching of the triplet state by the dendritic shell is observed and found to be substantially enhanced in aqueous media. On the other, the dendrimer shields the phthalocyanine from oxygen. This notwithstanding, the phthalocyanines are able to generate singlet oxygen in less polar environments such as in CHCl3 or THF solution, while in water the generation of singlet oxygen is almost completely switched off.

Idioma originalAnglès
Pàgines (de-a)3385-3393
Nombre de pàgines9
RevistaPhysical Chemistry Chemical Physics
Volum13
Número8
DOIs
Estat de la publicacióPublicada - 28 de febr. 2011

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