Die Kristallstruktur von Sc(CH3COO)3, ein Metall(III)acetat mit Kettenstruktur / Crystal Structure of Sc(CH3COO)3, a Metal(III) Acetate with a Chain Structure

Abstract

Sc(acO)3 was obtained from Sc2O3 and (CH3CO)2O or from Sc2(CO3)3 and acetic acid. Recrystallization in water yields hexagonal columns of anhydrous Sc(acO)3. It crystallizes in the space group P 63/mcm with the lattice constants a = 791.1(3) pm, c = 886.6(7) pm and z = 2. Sc(acO)3 exhibits a polymeric structure with a linear chain of metal atoms which are connected in each case by three bridging acetato groups. For the Sc atoms results a sixfold coordination in the form of a compressed octahedron with the symmetry D3d and with distances Sc-O = 208.4 pm. The columns of polymeric Sc(acO)3 are arranged like in an ideal hexagonal close packing of cylindrical rods.