Zwitterionic amidinates as effective ligands for platinum nanoparticle hydrogenation catalysts.

ABSTRACT: Ligand control of metal nanoparticles (MNPs) is rapidly gaining importance as ligands can stabilize the MNPs and regulate their catalytic properties. Herein we report the first example of Pt NPs ligated by imidazolium-amidinate ligands that bind strongly through the amidinate anion to the platinum surface atoms. The binding was established by ¹⁵N NMR spectroscopy, a precedent for nitrogen ligands on MNPs, and XPS. Both monodentate and bidentate coordination modes were found. DFT showed a high bonding energy of up to -48 kcal mol^-1 for bidentate bonding to two adjacent metal atoms, which decreased to -28 ± 4 kcal mol^-1 for monodentate bonding in the absence of impediments by other ligands. While the surface is densely covered with ligands, both IR and ¹

SUBMITTER: Martinez-Prieto LM 

PROVIDER: S-EPMC5376718 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature