Structural Systematics of Rare Earth Complexes. IX. Tris(nitrato-O,O')(bidentate-N,N')lutetium(III), N,N'-Bidentate Equals 2,2'-Bipyridine or 1,10-Phenanthroline

Abstract

Room-temperature single-crystal X-ray structure determinations of the title compounds, namely, [(ONO₂)₃Lu(N,N'-bidentate)₂], N,N'-bidentate = 'bpy' = 2,2'-bipyridine or 'phen' = 1,10-phenan-throline, are recorded. The complexes are isomorphous with their previously studied lanthanum analogues, being orthorhombic, Pbcn, a 16.517(3), b 9.111(3), c 15.080(3) Ǻ, Z = 4 f.u., and monoclinic, C2/c, a 11.186(7), b 17.785(13), c 12.972(10) Ǻ, β 100.27(5)°, Z = 4 f.u., with R (on |F|) being 0.046 and 0.045 for 1339 and 2097 independent 'observed' (I > 3σ(I)) reflections respectively. The stereochemistries about the metal atoms are also similar, Lu(O₂)₃(N₂)₂, the metal atom in each case lying on a crystallographic twofold axis, which also passes through the axis of one of the bidentate nitrate groups; the latter, unlike their counterparts in the La/bpy complexes are not disordered.