Conjugates of low-symmetry Ge, Sn and Ti carboxy phthalocyanines with glutathione caped gold nanoparticles: An investigation of photophysical behaviour

Autor:	Nkosiphile Masilela, Tebello Nyokong
Rok vydání:	2011
Předmět:	Quenching (fluorescence) General Chemical Engineering General Physics and Astronomy Nanoparticle chemistry.chemical_element Quantum yield General Chemistry Photochemistry Fluorescence Chemical bond chemistry Colloidal gold Tin Conjugate
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 223:124-131
ISSN:	1010-6030
Popis:	This work reports on conjugation of low symmetry Ge (GeMCPc), Ti (TiMCPc) and Sn (SnMCPc) carboxy phthalocyanines with glutathione capped gold nanoparticles (GSH-AuNPs). The photophysical behaviour of the novel phthalocyanines–GSH-AuNPs conjugate was investigated and compared to the monocarboxy Pcs and to the mixture of Pc with GSH-AuNPs without a chemical bond. Blue shifting of Q band of the phthalocyanines was observed on linking to GSH-AuNPs. An improvement in triplet lifetimes was obtained for all the MPcs–GSH-AuNPs-linked conjugates compared to the MPcs alone. The highest triplet quantum yield of 0.75 and the longest triplet lifetime of 130 μs were obtained for the GeMCPc–GSH-AuNPs-linked conjugate. Fluorescence quantum yields and lifetimes were low for the conjugates due to quenching by the nanoparticles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::002d0f0da9f85f1ec7d7f7ff344d2c16 https://doi.org/10.1016/j.jphotochem.2011.08.009 Zobrazit plný text záznamu Full Text from ScienceDirect