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  • 1
    Electronic Resource
    Electronic Resource
    Electronic structure and bonding of the metal cluster compound Au55(PPh3)12Cl6 (1993)
    Springer
    The European physical journal 26 (1993), S. 162-165 
    Details
    ISSN: 1434-6079
    Keywords: 31.10.+z ; 36.40.+d ; 33.45.+x ; 33.60.-q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the electronic structure, bonding and physical properties of the gold cluster compound Au55(PPh3)12Cl6. Results from our experimental measurements, including EXAFS, specific heat, Mössbauer, UV-visible and photoelectron spectroscopy, are combined with those of other work to form a consistent physical picture of the system. The bonding in Au55(PPh3)12Cl6 is much more delocalised and non-directional than in smaller gold cluster molecules. The Au55 cluster exhibits a substantial degree of metallic bonding, while displaying some of the characteristics of a discrete energy level spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429131
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Exact analytical formulae for mean coordination numbers in clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 15-17 
    Details
    ISSN: 1434-6079
    Keywords: 68.35.Bs ; 36.40.+d ; 35.20.Bm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rigorous analytical formulae for mean nearest-neighbour coordination numbers in clusters as a function of cluster size have been derived for a range of geometries: the tetrahedron, octahedron, cuboctahedron, icosahedron and bcc rhombic dodecahedron. Formulae for outer-neighbour coordination numbers are also reported, including a complete analysis of interatomic distances and mean coordination numbers in icosahedra. The formulae will find application in studies of electronic structure and interpretation of EXAFS data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425603
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An EXAFS study of some gold and palladium cluster compounds (1993)
    Springer
    The European physical journal 26 (1993), S. 8-11 
    Details
    ISSN: 1434-6079
    Keywords: 61.10.Lx ; 61.60.+m ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gold L3-edge EXAFS measurements at 80 K on Au55(PPh3)12Cl6 confirm that the Au-Au distances in this amorphous metal cluster compound are significantly shorter than in bulk gold. The nearest-neighbour Au-Au distances are all equal within experimental uncertainty. Outer-shell Au-Au distances have also been resolved. The results are consistent with the cuboctahedral structure originally proposed for this cluster, but not the polyicosahedral one recently suggested. Very similar results have been obtained from the sulphonated water-soluble derivative Au55(PPh2C6H4SO3Na)12Cl6. In contrast, EXAFS of Au11{PPh2(p-ClC6H4)}7I3 has clearly resolved the two nearest-neighbour Au-Au distances associated with its icosahedral structure. Palladium K-edge EXAFS has been used to study the cluster Pd561(phen)36O200. The Pd-Pd distance is nearly equal to that in bulk palladium. The results show a cubic close-packed cluster structure for this material, in contrast to the icosahedral structure reported for Pd561(phen)60(OAc)180.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425601
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic spectra of metal cluster molecules (1993)
    Springer
    The European physical journal 26 (1993), S. 4-7 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.Kf ; 73.20.Mf ; 36.40.+d ; 82.70.Dd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic absorption spectra (UV-visible-NIR) of a range of molecular metal cluster compounds, including new spectra of Pt309(phen*)36O28 in solution and Au55(PPh3)12Cl6 in the solid state, are discussed and compared with the spectra of colloidal particles of the corresponding metals. We consider frontier orbital separations, the development of ‘interband’ absorptions, the possible appearance of molecular plasma resonances, and charge-transfer in the solid state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425600
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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