Crystal structures of the Lewis acid–base adducts {[(C6H11)2N]3Ti–LB}+[MeB(C6F5)3]−·1.5C7H8; LB = (C6H5)3PO (1), p-F—C6H4CN (2)

Abstract

The reaction of [(C6H11)2N]3Ti—CH3 with the Lewis acid B(C6F5)3, followed by addition of the Lewis bases (C6H5)3PO and p-F—C6H4CN led to the complex salts tris(dicyclohexylamido)(triphenylphosphine oxide)titanium methyltris(pentafluorophenyl)borate toluene sesquisolvate, [Ti(C12H22N)3(C18H15OP)](C19H3F15B)·1.5C7H8, (1), and tris(dicyclohexylamido)(4-fluorobenzonitrile)titanium methyltris(pentafluorophenyl)borate toluene sesquisolvate, [Ti(C12H22N)3(C7H4FN)](C19H3F15B)·1.5C7H8, (2), both crystallizing with 1.5 equivalents of toluene solvent molecules. The Lewis acid–base adducts (1) and (2) can be described by dative donor bonds. The packing of the complex cations, anions and solvent molecules in the crystal structure is consolidated by an intricate three-dimensional network of non-classical C—H...F interactions. Disorder of some of the cyclohexyl groups and the toluene solvent molecules is observed.

Keywords

• crystal structure
• titanium
• lewis acidity
• disorder
• c—h...f hydrogen-bonding