[Ge-2](4-) Dumbbells with Very Short Ge-Ge Distances in the Zintl Phase Li3NaGe2: A Solid-State Equivalent to Molecular O-2

Lavinia M. Scherf, Antti J. Karttunen, Oliver Pecher, Pieter C. M. M. Magusin, Clare P. Grey, Thomas F. Faessler*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    The novel ternary Zintl phase Li3NaGe2 comprises alkali-metal cations and [Ge-2](4-) dumbbells. The diatomic [Ge-2](4-) unit is characterized by the shortest Ge-Ge distance (2.390(1)angstrom) ever observed in a Zintl phase and thus represents the first Ge=Ge double bond under such conditions, as also suggested by the (8-N) rule. Raman measurements support these findings. The multiple-bond character is confirmed by electronic-structure calculations, and an upfield Li-6 NMR shift of -10.0ppm, which was assigned to the Li cations surrounded by the systems of three Ge dumbbells, further underlines this interpretation. For the unperturbed, ligand-free dumbbell in Li3NaGe2, the -bonding p(y) and p(z) orbitals are degenerate as in molecular oxygen, which has singly occupied orbitals. The partially filled -type bands of the neat solid Li3NaGe2 cross the Fermi level, resulting in metallic properties. Li3NaGe2 was synthesized from the elements as well as from binary reactants and subsequently characterized crystallographically.

    Original languageEnglish
    Pages (from-to)1075-1079
    Number of pages5
    JournalAngewandte Chemie
    Volume55
    Issue number3
    DOIs
    Publication statusPublished - 18 Jan 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • double bonds
    • germanium dumbbells
    • lithium
    • sodium
    • Zintl phases
    • CRYSTAL-STRUCTURE
    • GERMANIUM
    • COMPOUND
    • LITHIUM
    • ANIONS
    • BOND
    • NMR

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