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Issue 19, 2018
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Au36(SePh)24 nanomolecules: synthesis, optical spectroscopy and theoretical analysis

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Abstract

Here, we report the synthesis of selenophenol (HSePh) protected Au36(SePh)24 nanomolecules via a ligand-exchange reaction of 4-tert-butylbenzenethiol (HSPh-tBu) protected Au36(SPh-tBu)24 with selenophenol, and its spectroscopic and theoretical analysis. Matrix assisted laser desorption ionization (MALDI) mass spectrometry, electrospray ionization (ESI) mass spectrometry and optical characterization confirm that the composition of the as synthesized product is predominantly Au36(SePh)24 nanomolecules. Size exclusion chromatography (SEC) was employed to isolate the Au36(SePh)24 and temperature dependent optical absorption studies and theoretical analysis were performed. Theoretically, an Independent Component Maps of Oscillator Strength (ICM-OS) analysis of simulated spectra shows that the enhancement in absorption intensity in Au36(SePh)24 with respect to Au36(SPh)24 can be ascribed to the absence of interference and/or increased long-range coupling between interband metal core and ligand excitations. This work demonstrates and helps to understand the effect of Au–Se bridging on the properties of gold nanomolecules.

Graphical abstract: Au36(SePh)24 nanomolecules: synthesis, optical spectroscopy and theoretical analysis

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Publication details

The article was received on 09 Mar 2018, accepted on 17 Apr 2018 and first published on 08 May 2018


Article type: Paper
DOI: 10.1039/C8CP01564C
Citation: Phys. Chem. Chem. Phys., 2018,20, 13255-13262
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    Au36(SePh)24 nanomolecules: synthesis, optical spectroscopy and theoretical analysis

    M. Rambukwella, L. Chang, A. Ravishanker, A. Fortunelli, M. Stener and A. Dass, Phys. Chem. Chem. Phys., 2018, 20, 13255
    DOI: 10.1039/C8CP01564C

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