Affiliation:
1. 1Institut für Anorganische und Analytische Chemie, Univ. Freiburg, Albertstr. 21, D-79104 Freiburg
Abstract
The new binary alkaline earth rich indides Ca2In (orthorhombic, space group Pnma, a =727.5(2), b = 537.1(2), c = 999.0(3) pm, Z = 4, R1 = 0.0252, Co2Si structure type) and Sr28In11 (orthorhombic, space group Imm2, a=582.6(3), b=6687.8(9), c=823.5(6) pm, Z =2, R1=0.0571, Ca28Ga11 structure type) have been synthesized from stoichiometric melts of the elements. Both crystal structures exhibit isolated In atoms coordinated by seven to ten alkaline earth atoms. In the crystal structure of Sr5In3 (tetragonal, space group I4/mcm, a = 874.4(3), c = 1642.9(8) pm, Z = 4, R1 = 0.0347, Cr5B3 structure type) isolated In atoms coexist with In2 dumbbells exhibiting short In-In contacts (284.4 pm). The electronic structures of the less elaborate compounds Ca2In and Sr5In3 are discussed in comparison with those of the closely related, nominally electron precise Zintl compounds Ca2Sn and Sr5Sn3.
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16 articles.
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