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Near-infrared croconaine rotaxanes and doped nanoparticles for enhanced aqueous photothermal heating.
Spence, Graeme T; Lo, Shun Shang; Ke, Chenfeng; Destecroix, Harry; Davis, Anthony P; Hartland, Gregory V; Smith, Bradley D.
Afiliação
  • Spence GT; Department of Chemistry and Biochemistry, University of Notre Dame, IN 46556 (USA).
Chemistry ; 20(39): 12628-35, 2014 Sep 22.
Article em En | MEDLINE | ID: mdl-25146580
The photothermal effect is the generation of heat by molecules or particles upon high-energy laser irradiation, and near-infrared absorbers such as gold nanoparticles and organic dyes have a range of potential photothermal applications. The favourable photothermal properties of thiophene-functionalised croconaine dyes were recently discovered. The synthesis and properties of novel croconaine rotaxane and pseudorotaxane architectures capable of efficient photothermal performance in both organic and aqueous environments are reported. The versatility of this dye-encapsulation strategy was demonstrated by the preparation of two organic croconaine rotaxanes using different synthetic methods: the formation of an aqueous pseudorotaxane association complex, and the synthesis of water-soluble, croconaine-doped silicated micelle nanoparticles. All of these near-infrared-absorbing systems exhibit excellent photothermal behaviour, with pseudorotaxane and rotaxane formation vital for effective aqueous heat generation. Dye encapsulation provides steric protection to enhance the stability of a water-sensitive croconaine dye, while rotaxane-doped nanoparticles avoid detrimental band broadening caused by chromophore coupling.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chemistry Assunto da revista: QUIMICA Ano de publicação: 2014 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chemistry Assunto da revista: QUIMICA Ano de publicação: 2014 Tipo de documento: Article