کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
27251 | 44012 | 2011 | 8 صفحه PDF | دانلود رایگان |
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.
► Phthalocyanine are conjugated to gold nanoparticles.
► Blue shifting of the spectra is observed following conjugation.
► Triplet yields and lifetimes increase on conjugation.
► Fluorescence quantum yields and lifetimes decrease on conjugation.
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 223, Issues 2–3, 25 September 2011, Pages 124–131