Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||Justin Golightly; Lin Gao; A W. Castleman; Denis E. Bergeron; Jeffrey W. Hudgens; Rudolph Magyar; Carlos A. Gonzalez;|
|Title:||Impact of Swapping Ethyl for Phenyl Groups on Diphosphine-Protected Undecagold|
|Published:||September 01, 2007|
|Abstract:||1,3-Bis(diethylphosphino)propane (depp) protected gold clusters are synthesized and studied via electrospray ionization mass spectrometry. An undecagold cluster, [Au11(depp)4Cl2]+, is observed under soft ionization conditions, and is found to persist in solution for at least one month. The importance of the Cl ligands is discussed in terms of the electron donating nature of the depp ligands, and we contrast the core-ligand interactions observed here with those found in the previously reported [Au11(dppp)5]3+ (where dppp = 1,3-Bis(dipheynylphosphino)propane). The experimental observations are supported by density functional theory calculations, which confirm the electron donating nature of depp and the electron withdrawing nature of dppp. The results demonstrate that a degree of caution is merited when making ligand approximations for modeling of monolayer protected nanoparticles.|
|Citation:||Journal of the American Chemical Society|
|Keywords:||density functional theory,electrospray ionization,gold nanoparticle,mass spectroscopy,monolayer protected cluster|