Issue 4, 2018

High-performance liquid chromatography mass spectrometry of gold and alloy clusters protected by hydrophilic thiolates

Abstract

In this work, we found two hydrophilic interaction liquid chromatography (HILIC) columns for high-performance liquid chromatography (HPLC) suitable for the high-resolution separation of hydrophilic metal clusters. The mass distributions of the product mixtures of hydrophilic metal clusters were evaluated via HPLC mass spectrometry (LC/MS) using these HILIC columns. Consequently, we observed multiple clusters that had not been previously reported for glutathionate (SG)-protected gold clusters (Aun(SG)m). Additionally, we demonstrated that AunxMx(SG)m alloy clusters (M = Ag, Cu, or Pd) in which part of the Au in the Aun(SG)m cluster is replaced by a heteroelement can be synthesized, similar to the case of hydrophobic alloy clusters. It is easy to evaluate the mass distributions of hydrophilic metal clusters using this method. Thus, remarkable progress in the synthesis techniques of hydrophilic metal clusters through the use of this method is anticipated, as is the situation for hydrophobic metal clusters.

Graphical abstract: High-performance liquid chromatography mass spectrometry of gold and alloy clusters protected by hydrophilic thiolates

Supplementary files

Article information

Article type
Paper
Submitted
21 Oct 2017
Accepted
20 Nov 2017
First published
20 Nov 2017

Nanoscale, 2018,10, 1641-1649

High-performance liquid chromatography mass spectrometry of gold and alloy clusters protected by hydrophilic thiolates

Y. Niihori, D. Shima, K. Yoshida, K. Hamada, L. V. Nair, S. Hossain, W. Kurashige and Y. Negishi, Nanoscale, 2018, 10, 1641 DOI: 10.1039/C7NR07840D

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