Preparation and crystal structures of donor-functionalized 2,2′-oxydiethanol complexes of titanium, yttrium, magnesium and sodium

Abstract

The complexes [cis-TiCl₂(η³-digol)(THF)], [YCl₃(η³-H₂digol)(THF)], [Mg₂(µ-Cl)₂(η³-H₂digol)₂(THF)₂]Cl₂ and [Na₂(µ,η²-H₂digol)₂(η³-Hdigol)₂] have been synthesized and structurally characterized by X-ray diffraction. Complex 1 consists of a dichlorotitanium(IV) core with a doubly deprotonated mer-coordinated tridentate 2,2′-oxydiethanlato(2-) and THF ligands. Compound 2 has a distorted pentagonal bipyramidal structure with chlorine ligands in the axial positions. In the [Mg₂(µ-Cl)₂(η³-H₂digol)₂(THF)₂]²⁺ cation of 3, each magnesium atom is octahedrally coordinated by two µ-Cl atoms, the chelate tridentate η³-H₂digol ligand and the oxygen atom of the coordinated THF molecule. The structure of 4 includes two six-coordinated sodium atoms linked by two OH bridges. Three oxygen atoms of η³-Hdigol and one ether oxygen atom of the η²-H₂digol ligands complete the coordination sphere of the sodium atoms. One of the oxygen atoms of the η²-H₂digol hydroxyl group remains uncoordinated.