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):||John M. Pettibone; Jeffrey W. Hudgens;|
|Title:||Reaction Network Governing Diphosphine-Protected Gold Nanocluster Formation from Nascent Cationic Platforms|
|Published:||February 16, 2012|
|Abstract:||We identify the reaction network governing gold monolayer protected cluster (MPC) formation during the reduction of Au(PPh3)Cl and L5 (L5 = 1,5-bis(diphenylphosphino)pentane) in solutions. UV-vis spectroscopy and electrospray ionization mass spectrometry (ESI-MS) monitored the formation of ligated Aux : 6 ≤ x ≤ 12 clusters, which comprise the reaction intermediates and final products. Initially, predominantly [Au2L52]2+ complexes form through dissolution of Au(PPh3)Cl. These complexes control the reduction and nucleation reactions that form nascent phosphine-ligated Au8 and Au10 ionic clusters. [Au10L54]2+ is an observed growth platform for ligated Au11 and Au12 clusters. The data for syntheses of Au:L5 systems evidence that the nascent reaction products (t < 3 days) are less dependent on the chosen reducing agent (borane tert-butylamine complex or NaBH4); instead, after reduction ceases, subsequent solution phase processing provides greater control for tuning cluster nuclearity.|
|Citation:||Physical Chemistry Chemical Physics|
|Pages:||pp. 4142 - 4154|
|Keywords:||gold, cluster, nanoparticle, electrospray mass spectrometry, reaction pathway, nucleation|
|Research Areas:||Nanotechnology, Chemistry, Materials Science|
|PDF version:||Click here to retrieve PDF version of paper (1MB)|