Intensely and broadly absorbing nanoparticles (IBANs) of silver protected by arylthiolates were recently synthesized and showed unique optical properties, yet question of their dispersity and their molecular formulas remained. Here IBANs are identified as a superatom complex with a molecular formula of Ag 44(SR) 30 4- and an electron count of 18. This molecular character is shared by IBANs protected by 4-fluorothiophenol or 2-naphthalenethiol. The molecular formula and purity is determined by mass spectrometry and confirmed by sedimentation velocity-analytical ultracentrifugation. The data also give preliminary indications of a unique structure and environment for Ag 44(SR) 30 4-. This journal is © 2012 The Royal Society of Chemistry.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): FIC/2010/02
Acknowledgements: Financial support for this work was provided by the National Institutes of Health (RC2DA028981 and R01GM076479), the National Science Foundation (NSF 0903787), the Defense Threat Reduction Agency (HDTRA1-09-0013), the Vanderbilt College of Arts and Sciences, the Vanderbilt Institute of Chemical Biology, the Vanderbilt Institute for Integrative Biosystems Research and Education, and the King Abdullah University of Science and Technology (KAUST) FIC Award (FIC/2010/02).
ASJC Scopus subject areas
- Materials Science(all)