630426-38-9

Upstream product

• 10361-91-8 ytterbium(III) chloride 
• 223414-22-0 Li(2,6-iPr₂C₆H₃)NC(Me)CHC(Me)N(2,6-iPr₂C₆H₃) 
• 405885-00-9 N,N-2,6-diisopropylphenyl-2,4-pentanediimine ytterbium dichloride bis(tetrahydrofuran) 

Relevant academic research and scientific papers

Ytterbium complexes supported by β-diketiminate ligands: Cyclopentadienyl, indenyl, and aryloxide derivatives

Reactions of β-diketiminate ytterbium dichloride, LYbCl2(THF)2 (L = N,N-2,6-diisopropylphenyl-2,4-pentanediimine anion), with C5H5Na, in 1:1 or 1:2 molar ratio in tetrahydrofuran (THF) at room temperature give the mixed-ligand ytterbium complexes (C5H5)(L)YbCl (1) and (C5H5)2YbL (2), respectively. LYbCl2(THF)2 reacts with C9H7K or ArONa (ArO = 2,6-BU2t-4-MeC6H2O) in 1:1 molar ratio in THF to afford (C9H7)(L)YbCl (3) and (ArO)(L)YbCl(THF) (4) in high yield, respectively. Crystal structure analysis revealed that complex 3 is an unsolvated monomer, in which the ytterbium atom is coordinated by one indenyl ring, two nitrogen atoms of the diketiminate ligand and one chlorine atom, while complex 4 is a THF solvated monomer with the central metal five-coordinated by two nitrogen atoms, two oxygen atoms, and one chlorine atom.

Synthesis of a new class of compounds containing a Ln-O-Al arrangement and their reactions and catalytic properties

Synthesis of a new class of compounds containing a Ln-O-Al moiety has been accomplished by the reaction of LAIOH(Me) (L = HC(CMeNAr)2, Ar = 2,6-iPr2C6H3) with a series of Cp3Ln compounds. The terminal AI-OH group shows selective reactivity, and the complexes Cp2Ln(THF)-O-AIL(Me) (Ln = Yb, 1; Er, 2; Dy, 3), Cp 2Yb-O-AIL(Me) (4), and Cp3Ln(μ-OH)AIL(Me) (Ln = Er, 5; Dy, 6; Sm, 7) were obtained. This allows further insight into the proton exchange process, and two different mechanisms, intermolecular and intramolecular elimination of CpH, are proposed under different conditions. Complexes 1-4, 6, and 7 have been characterized by X-ray structural analyses which reveals a Ln-O-Al or Ln(μ-OH)Al core in these complexes. The obtuse Ln-O-Al angles fall in the range 151.9-169.8°. The reaction of 1 or 4 with Me3SnF in toluene under refluxing conditions unexpectedly yielded the compounds [Cp2Yb-(μ-OSnMe3)]2 (8) and LAI(Me)F (9). Reactions of LAIOH(Me) with the mono- and dicyclopentadienyl complexes LYbCp(Cl) (10) and LYbCp2 (11) supported by the bulky β-diketiminate ligand were unsuccessful. However, the reaction of LAI(OH)Me with LYbN(SiMe3)2Cl (12) containing a labile Yb-N bond leads to the formation of LYbCl-O-AIL(Me) (13) under elimination of HN(SiMe 3)2. Furthermore, complexes 1, 3, 4, and 6 exhibit good catalytic activity for the polymerization of ε-caprolactone.