STRUCTURE OF SR3SC(BO3)3

The structure of the compound Sr3Sc(BO3)3 is described. Crystal data: FW = 484.24 amu, R3BAR (No. 148), hexagonal axes, a = 12.135(1), c = 9 .184(1) angstrom, V = 1171.3(2) angstrom3, Z = 6, Mo Kalpha (lambda = 0.710 69 angstrom), mu = 206.38 cm-1, F(000) = 1332, T = 296 K, R = 0. 018, R(w) = 0.022 for 725 averaged reflections. The structure exhibits chains comprised of Sc-centered O octahedra and BO3 triangles that ar e bridged by 9-coordinate Sr atoms. Each chain contains two crystallog raphically independent Sc atoms; the distorted octahedral environment about atom Sc1 is compressed along the trigonal axis, O1-Sc1-O1 = 85.2 0(7)-degrees, while the environment about atom Sc2 is elongated along the same axis, O2-Sc2-O2 = 92.28(7)-degrees. These angles are consiste nt with the chemical inequivalence of the environments as determined b y their associations with neighboring Sr atoms.