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Ligand Dissociation and Core Fission from Diphosphine Protected Gold Clusters



Denis E. Bergeron, Jeffrey W. Hudgens


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.
Journal of Physical Chemistry C


cluster fission, collision induced dissociation, electrospray, ligand, mass spectrometry, monolayer protected gold nanoparticle


Bergeron, D. and Hudgens, J. (2007), Ligand Dissociation and Core Fission from Diphosphine Protected Gold Clusters, Journal of Physical Chemistry C (Accessed April 16, 2024)
Created May 19, 2007, Updated February 17, 2017