THE 1ST OLIGOOXOINDATE(III) - K14[IN4O13]

For the first time K14[In4O13] was obtained by heating intimate mixtur es of K2O, CdO and elementar In (molar ratio 3.1:1.0:1.0) in closed Ag -cylinders (30 days, 450-degrees-C) in form of yellow-brown single cry stals. The structure determination by four circle diffractometer data (MoKalpha, 3 689 out of 3 689 I(o)(hkl), R = 4.22, R(w) = 2.45) confir ms the space group P2(1)/c with lattice constants a = 687.7 pm; b = 3 118.5 pm; c = 686.4 pm; beta = 119.3-degrees; Z = 2. The characteristi c feature of the structure is [In4O13]14- groups, oligomers consisting of four corner-sharing InO4 tetrahedra. These groups are connected by crystallographically distinct potassium atoms. The structure is isoty pic with Na14[Al4O13] [2] and K14[Fe3O13] [3]. ECoN and MAPLE calculat iones are discussed.