1338579-22-8Relevant academic research and scientific papers
Crystal structures of Au2 complex and Au25 nanocluster and mechanistic insight into the conversion of polydisperse nanoparticles into monodisperse Au25 nanoclusters
Qian, Huifeng,Eckenhoff, William T.,Bier, Mark E.,Pintauer, Tomislav,Jin, Rongchao
, p. 10735 - 10739 (2011)
We previously reported a size-focusing conversion of polydisperse gold nanoparticles capped by phosphine into monodisperse [Au25(PPh 3)10(SC2H4Ph)5Cl 2]2+ nanoclusters in the presence of phenylethylthiol. Herein, we have determined the crystal structure of [Au25(PPh 3)10(SC2H4Ph)5Cl 2]2+ nanoclusters and also identified an important side-product-a Au(I) complex formed in the size focusing process. The [Au 25(PPh3)10(SC2H4Ph) 5Cl2]2+ cluster features a vertex-sharing bi-icosahedral core, resembling a rod. The formula of the Au(I) complex is determined to be [Au2(PPh3)2(SC 2H4Ph)]+ by electrospray ionization (ESI) mass spectrometry, and its crystal structure (with SbF6- counterion) reveals Au-Au bridged by-SC2H4Ph and with terminal bonds to two PPh3 ligands. Unlike previously reported [Au2(PR3)2(SC2H4Ph)] + complexes in the solid state, which exist as tetranuclear complexes (i.e., dimers of [Au2(PR3)2(SC 2H4Ph)]+ units) through a Au??? Au aurophilic interaction, in our case we found that the [Au 2(PPh3)2(SC2H4Ph)] + complex exists as a single entity, rather than being dimerized to form a tetranuclear complex. The observation of this Au(I) complex allows us to gain insight into the intriguing conversion process from polydisperse Au nanoparticles to monodisperse Au25 nanoclusters.
