Structure of a Thiol Monolayer-Protected Gold Nanoparticle at 1.1 A Resolution

✍ Scribed by Jadzinsky, P. D.; Calero, G.; Ackerson, C. J.; Bushnell, D. A.; Kornberg, R. D.

• Book ID: 111972123
• Publisher: American Association for the Advancement of Science
• Year: 2007
• Tongue: English
• Weight: 412 KB
• Volume: 318
• Category: Article
• ISSN: 0036-8075
• DOI: 10.1126/science.1148624

✦ Synopsis

Structural information on nanometer-sized gold particles has been limited, due in part to the problem of preparing homogeneous material. Here we report the crystallization and x-ray structure determination of a
p
-mercaptobenzoic acid (p-MBA)–protected gold nanoparticle, which comprises 102 gold atoms and 44 p-MBAs. The central gold atoms are packed in a Marks decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. The p-MBAs interact not only with the gold but also with one another, forming a rigid surface layer. The particles are chiral, with the two enantiomers alternating in the crystal lattice. The discrete nature of the particle may be explained by the closing of a 58-electron shell.