Synthesis and Optical Properties of a Dithiolate/Phosphine-Protected Au28 Nanocluster
AuthorsAljuhani, Maha A.
Bootharaju, Megalamane Siddaramappa
Mohammed, Omar F.
KAUST DepartmentChemical Science Program
Functional Nanomaterials Lab (FuNL)
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2017-01-04
Print Publication Date2017-05-25
Permanent link to this recordhttp://hdl.handle.net/10754/623917
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AbstractWhile monothiols and simple phosphines are commonly exploited for size-controlled synthesis of atomically precise gold nanoclusters (NCs), dithiols or dithiol-phosphine combinations are seldom applied. Herein, we used a dithiol (benzene-1,3-dithiol, BDT) and a phosphine (triphenylphosphine, TPP) together as ligands and synthesized an atomically precise gold NC with the formula [Au28(BDT)4(TPP)9]2+. This NC exhibited multiple absorption features and a charge of +2, which are distinctly different from the reported all-thiolated [Au28(SR)20]0 NC (SR: monothiolate). The composition of [Au28(BDT)4(TPP)9]2+ NC was deduced from high-resolution electrospray ionization mass spectrometry (ESI MS) and it was further corroborated by thermogravimetric analysis (TGA). Differential pulse voltammetry (DPV) revealed a HOMO–LUMO gap of 1.27 eV, which is in good agreement with the energy gap of 1.3 eV obtained from its UV–vis spectrum. The successful synthesis of atomically precise, dithiol-protected Au28 NC would stimulate theoretical and experimental research into bidentate ligands as a new path for expanding the library of different metal NCs, which have so far been dominated by monodentate thiols.
CitationAljuhani MA, Bootharaju MS, Sinatra L, Basset J-M, Mohammed OF, et al. (2017) Synthesis and Optical Properties of a Dithiolate/Phosphine-Protected Au28 Nanocluster. The Journal of Physical Chemistry C. Available: http://dx.doi.org/10.1021/acs.jpcc.6b10205.
SponsorsThe work reported here was supported by KAUST.
PublisherAmerican Chemical Society (ACS)