Two Colors of Light Are Needed to Break Bonds and Release Small Molecules from the Surface of SiO2–Au Core–Shell Nanoparticles
摘要:
The photothermal effect is not able to break bonds and release small molecules from the surface of SiO2-Au core-shell nanoparticles unless the nanosystem is first exposed to visible light. Only after this light triggers the ring-opening reaction of dithienylethene chromophores attached to the surface of the nanoparticles can the heat generated by the NIR light induce reverse Diels-Alder reactions.
Orthogonal functionalization of a fullerene building block through copper-catalyzed alkyne–azide and thiol–maleimide click reactions
摘要:
In this study, the synthesis of an orthogonally clickable fullerene building block mono-adduct bearing on one side an alkyne unit and a maleimide moiety on the other side is presented. This derivative has been involved in CuAAC and thiol-maleimide click reactions using stepwise or one-pot processes with benzyl azide and 1-octanethiol. The one-pot process involving the CuAAC reaction followed by the thiol maleimide conjugation gives the highest yield. This new platform could pave the way for the synthesis of a wide range of fullerene derivatives exploiting this set of orthogonal reactions. (C) 2014 Elsevier Ltd. All rights reserved.