The title complex, [(ArO)2Sm(OPPh3)(m-OH)]2 (ArO = 2,6-tBu2-4-Me-C6H2O), was obtained by the hydrolysis reaction of divalent samarium aryloxide, Sm(ArO)2(THF)4, in the presence of triphenylphosphine oxide (OPPh3) in toluene. Crystal data: C96H124O8P2Sm2, Mr = 1768.77, monoclinic, space group P21/n, a = 15.276(6), b = 19.406(9), c = 19.320(7) ? b = 108.59(2), V = 5428(3) 3, Z = 2, Dc = 1.081 g/cm3, F(000) = 1836, T = 293 K, l(MoKa) = 0.71069 ?and m = 11.47 cm-1. The final R = 0.072 and wR = 0.092 for 2456 observed reflections with I ≥ 3s(I). The molecule has a dimeric structure with two centrosymmetric hydroxyl bridges. The samarium atom is coordinated by five oxygen atoms to form a distorted square-pyramid geometry with the average SmO(Ar) distance of 2.18 ?
The reaction of anhydrous YbCl3 with LiNPri2 in 1:3 molar ratio gave the homo- leptic lanthanide amide ate complex Yb(C6H14N)4Li(C4H8O). The crystal structure was determined by X-ray diffraction and the following crystallographic data were obtained: C28H64N4OYbLi, Mg = 652.82, monoclinic, P21/c (#14), a = 15.239(3), b = 21.502(6), c = 21.288(4) ? b = 93.18(2), V = 6964(2) 3, Z = 8, Dc = 1.245 g/cm3, F(000) = 2728 and m(MoKa) = 27.08 cm-1. The final R and Rw are 0.044 and 0.053 for 6765 observed reflections with I > 3.00s(I), respectively. The ytterbium atom is bonded to two terminal amide ligands with the normal YbN distances of 2.171(6) and 2.174(7) ? and two bridging amide ligands with the YbN bonds about 0.1 ?longer than those of the formers, forming a distorted tetrahedral geometry.
The divalent Sm complex supported by Schiff base ligand [2 OC 6H 4CH [ZJLX,Y] N(2,6 i Pr 2 C 6H 3)] 2Sm(THF) 2 has been prepared by the reaction of 2Sm(THF) 2 has been prepared by the reaction of [2 OC 6H 4CH [ZJLX,Y] N(2,6 i Pr 2C 6H 3)]Na Na with SmI 2 in THF. It exhibits a good catalytic activity for the polymerization of ε caprolactone, and the polymer obtained has a narrow molecular weight distribution.
