By means of spooling spectroscopy, we demonstrate our discovery on near-infrared electrochemiluminescence of Au ₂₅ ⁻ nanoclusters at 950 and 900 nm, which can be attributed to the Au ₂₅ ⁻ *, Au ₂₅ ⁰ * and Au ₂₅ ⁺ * excited species being controllable chemically and electrochemically.

A new method combining an interfacial strain-promoted azide–alkyne cycloaddition and post assembly deprotection (SPAAC-PAD) has been developed for the well-defined functionalization of small, water-soluble gold nanoparticles with oligopeptides.

Ultrasmall atomically precise monolayer- protected gold thiolate nanoclusters are an intensely researched nanomaterial framework, but there is a lack of a system that can be directly synthesized and undergo interfacial surface chemistry. We report an [Au25(SCH2CH2-p-C6H4-N3)18]− nanocluster plat- form with azide moieties appended onto each surface ligand. The structure of this surface reactive cluster has been confirmed by single-crystal X-ray crystallography, mass spectrometry and UV- Vis, IR and NMR spectroscopies. We show that all surface azide moieties are amenable to cluster-surface strain-promoted alkyne- azide cycloaddition (CS-SPAAC) chemistry with a strained cy- clooctyne, opening this as a new platform to allow functional, post-assembly surface modifications to this very prominent nanocluster.

A CNT–AuNP hybrid has been synthesized through the Michael addition reaction between thiol-functionalized single-wall CNT and small water-soluble Maleimide–AuNP. The resilience and stability of this hybrid nanosystem is ensured by a covalent bond linking the nanoparticle to the CNT and by the fact that the functionalization reaction involves the organic shell of the AuNP and not its metallic core.