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Publication Citation: Ligand Dissociation and Core Fission from Diphosphine Protected Gold Clusters

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Author(s): Denis E. Bergeron; Jeffrey W. Hudgens;
Title: Ligand Dissociation and Core Fission from Diphosphine Protected Gold Clusters
Published: May 19, 2007
Abstract: Highly monodisperse samples of diphosphine ligand (1,3-Bis(diphenylphosphino)propane or 1,5-bis(diphenylphosphino)pentane) protected gold nanoparticles form rapidly in a mixed methanol/chloroform solvent environment. Methanol soluble octagold, decagold, and undecagold monolayer protected clusters yield very stable ion currents when introduced into a mass spectrometer via electrospray ionization. In addition to neutral ligand loss pathways, collision induced dissociation generates [AuL]+ and [Au3L]+ (L = diphosphine ligand) as particularly stable product ions from all clusters considered. Furthermore, deca- and undecagold clusters are found to be more resistant to collision induced dissociation, and more susceptible to partial ligand losses than octagold clusters. This suggests that for the deca- and undecagold species, Au P and P Ph (Ph = phenyl) bonds within the ligand-protected clusters are of comparable strength.
Citation: Journal of Physical Chemistry C
Volume: 111
Issue: 23
Pages: pp. 8195 - 8201
Keywords: cluster fission;collision induced dissociation;electrospray;ligand;mass spectrometry;monolayer protected gold nanoparticle
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