Synthesis, reactivity and structural characterization of sodium and ytterbium complexes stabilized by a tridentate [N,N,O] Schiff base ligand

A tridentate [N,N,O] Schiff base [3,5-But2-2-(OH)-C6H2CHN-8-C9H6N(LH)] was prepared, and the corresponding sodium and ytterbium complexes were synthesized and characterized. Reaction of LH with NaH in THF at room temperature afforded the sodium salt of the Schiff base as a dimer [{LNa(THF)}2] (1). Complex 1 reacted with anhydrous YbCl3 in THF, after workup, to give the monomeric ytterbium Schiff base dichloride complex, [LYbCl2(DME)] (2). Complex 2 is a good precursor for the synthesis of the corresponding ytterbium derivatives. Reaction of complex 2 with 1 equiv. of NaCH3C5H4 in THF gave the expected product [LYb(CH3C5H4)Cl(THF)] (3) in a good isolated yield. Similar reaction of complex 2 with 2 equiv. of ArONa (ArOOC6H3-But2-2,6) in THF afforded the desired solvent-free ytterbium aryloxide [LYb(OAr)2] (4). Complex 4 can also be prepared by the protolytic exchange reaction of LH with (ArO)3Yb in a 1:1 molar ratio. All of these complexes were well characterized including X-ray structure determination.

The first soluble monomeric ytterbium dichloride complex stabilized by a tridentate [N,N,O] Schiff base ligand was synthesized. This ytterbium dichloride can be used as a precursor for the synthesis of the corresponding ytterbium derivatives via general metathesis reactions. All of the complexes are well characterized including X-ray crystal structure determination.Figure optionsDownload as PowerPoint slide