ChemInform Abstract: The New Complex Lanthanum Tetrelide La₅₅Sn_36.6Ge_24.4.

Abstract

The New Complex Lanthanum Tetrelide La 55 Sn 36.6 Ge 24.4 . -The new title compound is prepared by melting a stoichiometric mixture of the elements and its structure is determined by single crystal XRD. La55Sn36.6Ge24.4 crystallizes in the orthorhombic space group Cmcm with Z = 4. In addition to isolated Ge atoms, isolated Sn atoms, bent [Sn3] trimers, and planar [Sn4] rings, the structure contains eight-membered planar chain pieces [M 8 ] (M: Ge, Sn), which exhibit cis, trans, and also linear conformations. The structure of the title compound also contains polyanions [M24] consisting of eight-membered Ge rings, in which all atoms are bonded in a trigonal planar geometry. These rings are connected via two-bonded M pairs to form ribbons. A simple electron count reveals that the title compound is an electron precise Zintl phase. -(DUERR, I.; ROEHR*, C.; J. Alloys Compd. 514 (2012) 81-90, http://dx.