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RESEARCH PRODUCT

Alkoxo, chlorido, and methyl derivatives of oxidomolybdenum(VI) complexes with tetradentate [O3N]-type ligands

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description

Dioxomolybdenum(VI) complex [MoO 2 (Heg) 2 ] (H 2 eg = 1,2-ethanediol) reacts with phenolic ligand precursors tris(2-hydroxy-3,5-dimethylbenzyl)amine (H 3 L Me ) and tris(2-hydroxy-3,5-di- tert -butylbenzyl)amine (H 3 L t Bu ) to form oxomolybdenum(VI) complexes of type [MoO(L R ) (Heg)]. The Heg ligand can be replaced by other alcohols (i.e. 2-aminoethanol, 2-amino-2-methylpropan-1-ol, 2-(dimethylamino)ethanol or allyl alcohol) in the reaction at refluxing toluene or at neat alcohol. Treatment of [MoO(L R )(Heg)] with Me 3 SiCl yields corresponding chlorido complexes [MoO(L R )Cl]. These are also formed in the reaction of H 3 L R with [MoO 2 Cl 2 (dmf) 2 ]. The reaction of [MoO(L R )Cl] with MeMgI yields air-stable monomethyl derivatives [MoO(L R )(Me)]. X-ray analyses of [MoO(L t Bu )X] (X = Heg, 2-methyl-2-aminopropanolate anion or Cl) reveal that the ligand L R has a tetradentate coordination through three oxygen donors and one nitrogen donor, which is located trans to the terminal oxo group. The sixth coordination site is occupied by an oxygen donor, a chlorido ligand or a methyl group.