Identification of the formation of metal–vinylidene interfacial bonds of alkyne-capped platinum nanoparticles by isotopic labeling

Stable platinum nanoparticles were prepared by the self-assembly of 1-dodecyne and dodec-1-deuteroyne onto bare platinum colloid surfaces. The nanoparticles exhibited consistent core size and optical properties. FTIR and NMR measurements confirmed the formation of Pt–vinylidene (PtCCH–) interfacial linkages rather than Pt–acetylide (Pt–CC–) and platinum–hydride (Pt–H) bonds.