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Synthesis and Structure of a Neutral Trimetallic Biicosahedral Cluster, (Ph3P)10Au11Ag12Pt2Cl7. A Comparative Study of Molecular and Crystal Structures of Vertex-Sharing Biicosahedral Mixed-Metal Nanoclusters

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Abstract

The synthesis and structure of a new, neutral Au–Ag–Pt vertex-sharing biicosahedral cluster, [(Ph3P)10Au11Ag12Pt2Cl7] (3), is reported. The title cluster was synthesized via a new synthetic strategy based on preformed clusters. The title cluster crystallizes in a monoclinic unit cell of P21/m space-group symmetry with lattice parameters a=16.553(14) Å, b=25.130(7) Å, c=29.633(13) Å, β=103.03(5); V=12009.3 Å3 and Z=2. The structure was refined to R1=7.7% and R2=9.2% for 3585 independent reflections (2θ≤42°) with I>3σ. The metal core of the title structure can be described as two Pt-centered Au6Ag6 icosahedra sharing a common Au atom. The four metal pentagons adopt the staggered–eclipsed–staggered (ses) configuration, or, the R(0) rotamer. The ten triphenylphosphine ligands coordinate to the ten peripheral (surface) Au atoms in a radial fashion. There are five doubly-bridging chloride ligands connecting two Ag5 pentagons and two more chloride ligands coordinating terminally to two apical Ag atoms. The title cluster completes the series of Au-shared biicosahedral clusters with 0, 1, and 2 Pt atom(s) occupying the two icosahedral centers, as exemplified by [(p-Tol3P)10Au13Ag12Cl7]2+ (1), [(Ph3P)10Au12Ag12PtCl7]+ (2), and the title cluster [(Ph3P)10Au11Ag12Pt2Cl7] (3), respectively. The structure of the title cluster satisfies the site preference rules established for mixed-metal vertex-sharing polyicosahedral nanoclusters. The molecular structural invariance and the ubiquity of the P21/m space group for the crystal structures of the biicosahedral cluster series with Ph3P as phosphine ligands and conforming to the R(0) rotameric metal configuration are discussed. Furthermore, endo- and exo-icosahedral chemistries, and rotamerism and roulettamerism of an extensive series of vertex-sharing biicosahedral nanoclusters, as well as their bonding implications, are described via a comparative study.

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  1. Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Room 4500, Chicago, Illinois, 60607

    Boon K. Teo & Hong Zhang

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  1. Boon K. Teo
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Teo, B.K., Zhang, H. Synthesis and Structure of a Neutral Trimetallic Biicosahedral Cluster, (Ph3P)10Au11Ag12Pt2Cl7. A Comparative Study of Molecular and Crystal Structures of Vertex-Sharing Biicosahedral Mixed-Metal Nanoclusters. Journal of Cluster Science 12, 349–383 (2001). https://doi.org/10.1023/A:1016603903142

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