Reaction between the [MgCl4]2− anion and titanium chlorides. The crystal structure of [NBu4][trans-TiCl4(THF)2·THF

The reaction between [TiCl4(THF)2] and [NBu4]2[MgCl4] in tetrahydrofuran (THF) gave the compound [NBu4]2[TiCl6] (1). Under the influence of light in THF solution, the compound undergoes reduction to [NBu4][trans-TiCl4(THF)2]·THF (II). Compound II was also obtained by the direct reaction between [TiCl3(THF)3] and [MgCl4]2− ions. Crystals of II are orthorhombic, space group P212121 with a = 12.18(1), b = 17.09(1) and c = 18.57(2) Å; Z = 4. The structure was refined by full-matrix least-squares methods to R = 0.064 for 1569 independent non-zero reflections.