5 years ago

Core Size Interconversions of Au30(S-tBu)18 and Au36(SPhX)24

Core Size Interconversions of Au30(S-tBu)18 and Au36(SPhX)24
Tanya C. Jones, Luca Sementa, Alessandro Fortunelli, Shevanuja Theivendran, Amala Dass
We report for the first time the interconversion between two nanomolecules: Au36(SPhX)24, (where X = -H or -tBu) and Au30(S-tBu)18. This is accomplished through thermochemical etching, with HSPhX on Au30(S-tBu)18 which converts the nanomolecule to Au36(SPhX)24. We further show that the conversion is reversible from Au36(SPhX)24 to Au30(S-tBu)18 with tert-butyl thiol (HS-tBu) under the same thermochemical conditions. Not only is this the first reported interconversion between two nanomolecules, but this report further demonstrates the conversion from a smaller to a larger sized nanomolecule, which is a rare occurrence. Experimental evidence for the reversible conversion is provided using matrix assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS), nanoelectrospray ionization mass spectrometry (nESI-MS), and UV–vis–NIR spectroscopy. This discovery leads to valuable insight into the inherent nature of ligand dependency on the composition and atomic structure of gold–thiolate nanomolecules. The nanomolecules, Au36(SPhX)24 and Au30(S-tBu)18, have cuboctahedral atomic structures with fcc arrangement but have entirely different staple arrangements, with Au28 and Au20 cores, respectively. Theoretical studies show that the difference between Au30(S-tBu)18 and Au36(SPhH)24 resides in the different fragmentation energy of the two species: conjugation in Au36(SPhH)24 weakens the strength of ligand bonding to the Au cluster and thus makes it somewhat less stable than Au30(S-tBu)18. Furthermore, Au30(S-tBu)18 appears to be slightly more stable than Au36(SPhH)24 also in terms of atomization energy of the Au cluster and ligand/ligand interactions.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03860

DOI: 10.1021/acs.jpcc.7b03860

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.