Au38(SPh)24: Au38 Protected with Aromatic Thiolate Ligands
| Autor: | Marie Neubrander, Oscar Baseggio, Shayna Burrage, Amala Dass, Milan Rambukwella, Alessandro Fortunelli, Edoardo Aprà, Mauro Stener |
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| Přispěvatelé: | Rambukwella, Milan, Burrage, Shayna, Neubrander, Marie, Baseggio, Oscar, Aprà, Edoardo, Stener, Mauro, Fortunelli, Alessandro, Dass, Amala |
| Rok vydání: | 2017 |
| Předmět: |
Ligand
Chemistry Electrospray ionization Analytical chemistry Conclusive evidence 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Optical spectra 0104 chemical sciences monolayer protected clusters Desorption Mass spectrum Physical chemistry General Materials Science ligand effects Materials Science (all) Physical and Theoretical Chemistry Ionization mass spectrometry 0210 nano-technology Visible spectrum |
| Zdroj: | The journal of physical chemistry letters 8 (2017): 1530–1537. doi:10.1021/acs.jpclett.7b00193 info:cnr-pdr/source/autori:Rambukwella, Milan; Burrage, Shayna; Neubrander, Marie; Baseggio, Oscar; Apra, Edoardo; Stener, Mauro; Fortunelli, Alessandro; Dass, Amala/titolo:Au-38(SPh)(24): Au-38 Protected with Aromatic Thiolate Ligands/doi:10.1021%2Facs.jpclett.7b00193/rivista:The journal of physical chemistry letters/anno:2017/pagina_da:1530/pagina_a:1537/intervallo_pagine:1530–1537/volume:8 |
| ISSN: | 1948-7185 |
| Popis: | Au-38(SR)(24) is one of the most extensively investigated gold nanomolecules along with Au-25(SR)(18) and Au-144(SR)(60). However, so far it has only been prepared using aliphatic-like ligands, where R = -SC6H13, -SC12H25 and -SCH2CH2Ph. Au-38(SCH2CH2Ph)(24) when reacted with HSPh undergoes core-size conversion to Au-36(SPh)(24), and existing literature suggests that Au-38(SPh)(24) cannot be synthesized. Here, contrary to prevailing knowledge, we demonstrate that Au-38(SPh)(24) can be prepared if the ligand exchanged conditions are optimized, under delicate conditions, without any formation of Au-36(SPh)(24). Conclusive evidence is presented in the form of matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS), electrospray ionization mass spectra (ESI-MS) characterization, and optical spectra of Au-38(SPh)(24) in a solid glass form showing distinct differences from that of Au-38(S-aliphatic)(24). Theoretical analysis confirms experimental assignment of the optical spectrum and shows that the stability of Au-38(SPh)(24) is not negligible with respect to that of its aliphatic analogous, and contains a significant component of ligand-ligand attractive interactions. Thus, while Au-38(SPh)(24) is stable at RT, it converts to Au-36(SPh)(24) either on prolonged etching (longer than 2 hours) at RT or when etched at 80 degrees C. |
| Databáze: | OpenAIRE |
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