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

Reactions of beta-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)(2)YbL (2), respectively. LYbCl2(THF)(2) reacts with C9H7K or ArONa (ArO = 2,6-Bu-2(t)-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. (C) 2003 Elsevier Science Ltd. All rights reserved.