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  • 1
    Digitale Medien
    Digitale Medien
    M8(μ8-E′)(μ4-E)6L8 Species Centered and Hexacapped by Main-Group Atoms (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1161-1168 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Electron count ; Electronic structure ; Density functional calculations ; Transition metals ; Cluster compounds ; Interstitial element ; Main-group elements ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The bonding in main-group atom-centered hexacapped transition-metal cubic clusters M8(μ8-E′)(μ4-E)6L8 has been analyzed by means of density functional theory (DFT) calculations. Although only one example of such compounds has been characterized so far, DFT results indicate that it should be possible for other members of this family to be synthesized. As for their metal-centered parents, there are several “magic” electron numbers that are able to satisfy the closed-shell requirement for such species, depending on the nature of the metal and the capping ligands. The most probable cluster valence electron counts that imply significant M-M bonding are 120 and 122. The former value is favored when E′ is an early main-group element while the latter value is favored when E′ is a late main-group element. Owing to the high connectivity between the atoms, such a regular cubic architecture may also be observed with open-shell electron configurations, as observed for the 119-cluster-valence-electron cluster Ni8(μ8-As)(μ4-As)6(PPh3)8.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    1,2 and 1,6 Additions of Lithium Reagents to γ-Methylenepyran Fischer-Type Carbene Complexes; Evolution of the 1,2 and 1,6 Adducts to Unsaturated Carbene Complexes Indirectly Stabilized by a Heteroatom, and to Pyranylidene Carbene Complexes (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 577-581 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Methylenepyran carbene complexes ; Lithiation ; Carbene complexes ; Tungsten ; Carbenes ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---1,2 and 1,6 additions of lithium reagents to γ-methylenepyran Fischer-type carbene complexes are described. The 1,2 adducts obtained from alkynyllithium addition evolve by a 1,3 shift of the W(CO)5 fragment to give allenyltungsten carbonyl intermediates. Reaction with degassed water affords unsaturated carbene complexes indirectly stabilized by a heteroatom. The 1,6 anionic addition products are quenched by H2O at low temperature to give α,δ-unsaturated carbene complexes. On warming, an evolution occurs leading to new pyranylidene carbene complexes.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/099150_s.pdf or from the author.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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