Colloids and Surfaces A 538 (2018) 14–22 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Research Paper Speciﬁc turn-on near infrared ﬂuorescence from non-ﬂuorescent gold nanoclusters bearing sulfhydryl oligopeptides Nobuo Uehara , Natsumi Sonoda, Chikara Haneishi Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: We describe the development of near-infrared (NIR) ﬂuorescence from non-ﬂuorescent gold nanoclusters as a Gold result of the reaction with sulfhydryl oligopeptides. Non-ﬂuorescent gold nanoclusters with a diameter of about Nanoclusters 2 nm were synthesized by reducing HAuCl with NaBH in the presence of tetraethyleneglycol. The ﬂuorescence 4 4 Sulfhydryl oligopeptides of the gold nanoclusters bearing sulfhydryl compounds arose from the ligand-to-metal charge transfer from the Cysteinylglycine sulfhydryl compounds to the gold atoms at the gold nanocluster surface. The sulfhydryl oligopeptides cystei- Near infrared ﬂuorescence nylglycine, glutamylcysteine, and glutathione produced a ﬂuorescence band around 830 nm in the NIR region, whereas the sulfhydryl monopeptides cysteine and homocysteine produced ﬂuorescence in the visible region. Among the sulfhydryl oligopeptides, only cysteinylglycine exhibited stable ﬂuorescence without heating the solution. Because the ﬂuorescent gold nanoclusters bearing cysteinylglycine were so stable, monothiols, amine
Colloids and Surfaces A: Physicochemical and Engineering Aspects – Elsevier
Published: Feb 5, 2018
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