Bell–like [Ga₅] clusters in Sr₃Li₅Ga₅: synthesis, crystal structure and bonding analysis.

Abstract

During the search for a possible replacement of the europium in the structure Eu 3 Li 5 + x Ga 5À x (x = 0.15) in order to facilitate the analysis of the chemical bonding in the bell-like [Ga 5 ] clusters, the isostructural compound Sr 3 Li 5 Ga 5 (space group R3 m, a = 9.6040(5) Å, c = 22.061(1) Å) was discovered. A detailed investigation of the bonding situation in the first fivemembered nonconvex Ga cluster utilizing the electron localizability approach became possible, revealing not only first signs of a transition from a Zintl to a Wade cluster, but also the presence of a [Sr 6 ] polycation.

Be3Ru: Polar Multiatomic Bonding in the Closest Packing of Atoms

“…This resembles Zintl‐ and Wade‐type phases (cf. SrGe 6, [23] Sr 3 Li 5 Ga 5, [24] Ca 2 Ga 4 Ge 6, [25] Dy(Cu 0.18 Ga 0.82 ) 3.7 [26] ) more than ‘classical’ intermetallic compounds [27] . On the other hand, the DOS of Be 3 Ru in the vicinity of the Fermi level is similar to that of the recently investigated Be 21 Pt 5 [3] and Be 5 Pt compounds, [4] which show a strong electron transfer from Be to Pt.…”

Ca2Ga4Ge6 and Ca3Ga4Ge6: Synthesis, Structure, and Electronic Properties

“…Further work has emphasized how the structures of these phases can vary based on the changes in the cation and anion sizes, such as in A 21 Cd 4 Pn 18 (A=Eu, Sr, Ba; Pn=Sb, Bi) [6] . Discovering new materials in this family has also led to new structural motifs such as the bell‐like [Ga 5 ] polyanions in Sr 3 Li 5 Ga 5 [7] …”

“…[6] Discovering new materials in this family has also led to new structural motifs such as the bell-like [Ga 5 ] polyanions in Sr 3 Li 5 Ga 5 . [7] Recently, we discovered that transition metal-free layered Zintl-Klemm compounds with electronic structures that are Lewis acidic such as BaGa 2 , YGa 2 , and a new 13-layer trigonal polytype of CaGaGe (13T-CaGaGe), exhibit extraordinary catalytic activities in the partial and full hydrogenation of phenylacetylene to styrene and ethylbenzene. [1] These structures consist of honeycomb networks of main-group elements separated by the electropositive group 1-3 element/lanthanide.…”