Ferrocenyl Janus mixed-dendron stars and their stabilization of Au and Ag nanoparticles. Issue 37 (13th September 2018)

• Record Type: Journal Article
• Authors: Liu, Yue; Mu, Shengdong; Liu, Xiong; Ling, Qiangjun; Hang, Chaodong; Ruiz, Jaime; Astruc, Didier; Gu, Haibin
• Is Part Of: Tetrahedron. Volume 74:Issue 37(2018)
• Page Start: 4777
• Page End: 4789
• Publication Date: 2018-09-13
• Subjects: Ferrocene -- Dendrimer -- Janus -- Nanoparticule -- Redox; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2018.07.035
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: Janus molecular architectures have recently attracted attention due to their structures and properties that differ from those of traditional symmetric structures. Herein, two new small redox-reversible mixed-dendron star-shape molecules containing three ferrocenyl groups have been synthesized by linking two distinct dendrons using an esterification reaction. These organometallic nano structures were characterized by 1 H and 13 C NMR, MS, IR and UV–vis. spectroscopies and cyclic voltammetry confirming the number of ferrocenyl groups and AFM and DLS showing micellar assemblies. Au and Ag nanoparticles were stabilized in the presence of a mixed-dendron structure having amidoferrocene termini upon reaction of the nanoparticle metal precursor with NaBH4 . Compared reactions of the two star-molecules with HAuCl4 showed a slow redox reaction leading to Au nanoparticles only with the star-molecule terminated with triazolyferrocene termini, which is taken into account by the difference of their redox potentials. Graphical abstract: Image 1 Highlights: Janus molecules were designed with 3 hydrophobic ferrocenes and 3 triethylene glycol fragments. Amphiphile Janus ferrocene stars form micelles characterized by AFM and DLS. Janus ferrocene-containing star-shape molecules stabilize gold and silver nanoparticles.