Chemistry Seminar Series: Dr. Stefanie Dehnen

The right mix: Compounds with multinary polyanions

Dr. Stefanie Dehnen
Department of Chemistry
Philipps-Universität
Marburg, Germany

Monday, June 16, 2014
2:30 p.m.
C2 361 (Reading Room)

Abstract:  Multinary, non-oxidic metallates as well as metallides are currently actively investigated by many research groups, leading from structural studies through functional analyses to the generation of innovative materials.¹ Binary main group element aggregates proved to be useful synthetic tools for a large variety of different structural and functional motifs within ternary or multinary transition metal/main group metal/non-metal clusters and networks.²

Whereas chalcogenidotrielate/tetrelate ions [E^13/14_xE¹⁶_y]^q– (E^13/14 = Ga, In; Ge, Sn; E¹⁶ = S, Se, Te) may be basically viewed as heavier homologues of silicates or borates, the inversely polarized pnictogentrielide/tetrelide ions [E^13/14_xE¹⁵y]^q– (E^13/14 = Ga, In; Ge, Sn, Pb; E¹⁵ = As, Sb, Bi) have a distinct tendency to form so-called intermetalloid clusters.³

However, in both cases, the products of reactions with transition metal compounds differ significantly from any lighter homologues, as they represent unprecedented, ternary clusters or networks, according to the general type [M_xE^13/14_yE¹⁶_z]^q–, or ternary Zintl anions [M_xE^13/14_yE¹⁵_z]^q–. The physical properties of the compounds, which may represent (photo-) semi-conductors, ion conductors or bond-activating nano-capsules, are dependent on the nature of the involved elements and the observed structure type.^4–8 Also ionothermal techniques were successfully applied for the synthesis of novel salts of such complex anions.⁹

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