[Ga(en)3][Ga3Se7(en)] • H2O: A gallium chalcogenide with chains of [Ga3Se6Se2/2(en)]3- bicycles [Ga(en)3][Ga3Se7(en)] • H2O: Ein galliumchalkogenid mit ketten aus [Ga3Se6Se2/2(en)]3-·bicyclen

Abstract

The new selenidogallate [Ga(en)3][Ga3Se7(en)] · H2O (I) was produced from a ethylendiamine suspension of Ga and Se at 130°C. I crystallizes in the orthorhombic space group Pna21 with unit constants a=1347.9(3) pm, b=961.6(1) pm, c=1967.6(4) pm and Z=4. The crystal structure contains an anion so far not observed in gallium chalcogenides. It is built from [Ga3Se6Se2/2(en)]3- bicycles of three GaIIIL4 tetrahedra (L=en, Se) connected via selenium corners to linear chains. The cations, GaIII ions coordinated by three ethylendiamine in a distorted octahedral geometry are positioned in the holes of the hexagonal rod packing of these chains.