270903-79-2Relevant academic research and scientific papers
Heteroleptic diphenylamido complexes of ytterbium: Syntheses and molecular structures of (MeC5H4)2YbNPh2(THF) and (C5Me5)2YbNPh2
Wang, Yaorong,Shen, Qi,Xue, Feng,Yu, Kaibei
, p. 359 - 364 (2000)
Reaction of ytterbocene chloride with NaNPh2 in THF or toluene-THF at 0°C yielded the neutral diphenylamido complexes (MeC5H4)2YbNPh2(THF) (1), (t-BuC5H4)2YbNPh2(THF) (2) and (C5Me5)2YbNPh2 (3) in good yields. The crystal structures of 1 and 3 were identified by X-ray diffraction analysis. Complex 1 has a distorted tetrahedral arrangement around ytterbium by two MeC5H4 groups, one oxygen atom and one nitrogen atom [orthorhombic, space group Pbca (no. 61); a=15.188(1), b=18.145(1), c=17.444(1) A?; V=4807.3(5) A?3, Z=8, Dcalc.=1.579 g cm-3]. The crystal structure of 3 [monoclinic, space group P21/n; a=15.834(2), b=9.992(2), c=18.504(3) A?; β=104.060(10)°, V=2839.9(8) A?3, Z=4, Dcalc.=1.431 g cm-3] shows a triangular array of two C5Me5 groups and one nitrogen atom surrounding ytterbium with additional intramolecular Yb-η2-Ph chelate interactions [Yb-C=2.986(6) and 3.053(6) A?]. The complexes 1 and 2 exhibit good catalytic activity for the polymerization of methyl methacrylate.
