553681-98-4Relevant academic research and scientific papers
Donor-functionalized lanthanide terphenyl complexes: Synthesis and structural characterization of 2,6-Di(o-anisol)phenyl compounds of ytterbium, yttrium, and samarium
Rabe, Gerd W.,Zhang-Presse, Mei,Riederer, Florian A.,Yap, Glenn P. A.
, p. 3527 - 3533 (2003)
The syntheses and molecular structures of a number of 2,6-di(o-anisol)phenyl (=Danip-) -based bis(amide) and bis(alkoxide) compounds of ytterbium, yttrium, and samarium are reported. Addtionally, NMR spectroscopic data are reported for the analogous diamagnetic yttrium compounds. Salt metathesis reaction of equimolar amounts of DanipLi and YbCl3 in tetrahydrofuran at room temperature followed by addition of 2 equiv of KN(SiMe3)2 or KN- (SiHMe2)2 produces Danip Yb[N(SiMe3)2]2 (1) and Danip Yb[N(SiHMe2)2]2 (2), respectively. The analogous reaction using SmCl3 and KN(SiHMe2)2 produces DanipSm[N(SiHMe2)2]2 (3). Reaction of DanipLi and YbCl3 in tetrahydrofuran at room temperature followed by addition of 2 equiv of KO(2,6-diisopropylphenyl) produces Danip Yb[O(2,6- diisopropylphenyl)]2 (4). Our attempts to also prepare the yttrium analogue of complex 4 yielded single-crystalline material of the tetrahydrofuran adduct DanipY(THF)[O(2,6-diisopropylphenyl)]2 (5). The molecular structures of the complexes 1-4 feature five-coordinate metal atoms and coordination polyhedra which can be described as distorted square-pyramidal rather than trigonal-bipyramidal, with the ipso carbon atom occupying the apical position. On the other hand, the molecular structure of the tetrahydrofuran-solvated yttrium Danip arylalkoxide compound 5 features a six-coordinate metal atom in a distorted trigonal-prismatic coordination environment. In all cases the Danip ligand system adopts the chiral (racemic) d,I form.
