Organoamido- and aryloxo-lanthanoids. 26 [1] - Syntheses of bis(aryloxo)halogenoytterbium(III) complexes: [Yb(OAr)(2)X(THF)(2)] (X = Cl, Br, I; OAr=OC6H2-2,6-tBu(2)-4-R; R = H, Me, tBu) and the X-ray crystal structures of [Yb(OC6H2-2,6-tBu(2)-4-Me)(2

摘要

Oxidation of [Yb(OArR)(2)(THF)(3)] (OArR = OC6H2-2,6-tBu(2)-4-R; R = H, Me, tBu) with HgX2 or with (CH2X)(2) (X=Cl, Br, I) in THF yields [Yb(OArR)(2)X-(THF)(2)], whilst [Yb(OArMe)(2)Cl(THF)2] was also obtained by oxidation of the appropriate Yb(II) aryloxide with C2Cl6 in THE An X-ray crystal structure determination has shown [Yb(OArMe)(2)I(THF)(2)] to be a five coordinate monomer, in which ytterbium has distorted square pyramidal stereo-chemistry with mutually trans OArMe and THF ligands in the square plane and an apical iodide. Attempts to grow single crystals of [Yb(OArH)(2)Cl(THF)(2)] yielded [Yb(OArH)(2)-OH(THF)](2), shown to be an hydroxo-bridged dimer with five-coordinate ytterbium by X-ray crystallography. [References: 32]