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Research Article

Synthesis and Isolation of the Molecule-like Cluster Au₃₈(PhCH₂CH₂S)₂₄

Robert L. Donkers, Dongil Lee, and Royce W. Murray*

Kenan Laboratories of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290

Langmuir, 2004, 20 (5), pp 1945–1952

DOI: 10.1021/la035706w

Publication Date (Web): January 20, 2004

To whom correspondence may be addressed. rwm@email.unc.edu.

Abstract

The synthesis and characterization of phenylethanethiolate-coated monolayer protected clusters (MPCs) with Au₁₄₀ (average) and Au₃₈ cores are described. The latter 1.1 nm core diameter nanoparticles, whose Au₃₈(PhC2S)₂₄ composition was analytically established, are stable and isolable in relatively high purity and 200 mg quantities per reaction batch. Chemical shift effects in ¹H and ¹³C NMR spectra reveal the existence of either closely related Au₃₈ structures or differences between ligands on a given structure, or both. The Au₃₈(PhC2S)₂₄ MPCs undergo place exchange reactions with other thiolate ligands and, owing to their stability and ease of production, provide a gateway to other Au₃₈ MPCs with partially or completely different monolayer compositions.

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History

Published In Issue March 02, 2004
Received September 12, 2003
Revised December 8, 2003

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Research Article

Synthesis and Isolation of the Molecule-like Cluster Au₃₈(PhCH₂CH₂S)₂₄