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|Author(s):||Denis E. Bergeron; Orkid Coskuner; Jeffrey W. Hudgens; Carlos A. Gonzalez;|
|Title:||Ligand Exchange Reactions in the Formation of Diphosphine-Protected Gold Clusters|
|Published:||August 14, 2008|
|Abstract:||Electrospray ionization mass spectrometry is employed to study the formation of L3- and L5-protected gold clusters (L3 = 1,3-Bis(diphenylphosphino)propane; L5 = 1,5-Bis(diphenylphosphino)pentane), and it is found that molecular complexes in which Au+ is bound to at least one triphenylphosphine ligand (PPh3) act as precursors, while complexes in which Au+ is bound only to the bidentate diphosphine ligands act as reaction bottlenecks. Ligand exchange mechanisms and ion equilibria were established in the absence of a reducing agent, and a critical reaction was modeled with ab initio molecular dynamics simulations. The displacement of one PPh3 by L3 on [Au(PPh3)2]+ was studied with Car Parrinello molecular dynamics and transition path sampling. It is found that experiment and theory converge on a complete description of a reaction event critical in the synthesis of a particular set of monolayer protected nanoparticles.|
|Citation:||Journal of Physical Chemistry C|
|Pages:||pp. 12808 - 12814|
|Keywords:||Electrospray ionization, gold nanoparticle, Car-Parrinello molecular dynamics, monolayer protected gold cluster|
|PDF version:||Click here to retrieve PDF version of paper (1MB)|