Abstract: | Ga(en)3]Ga3Se7(en)] · H2O: A Gallium Chalcogenide with Chains of Ga3Se6Se2/2(en)]3– Bicycles 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. |