Complexes of the Actinide iv Halides

A large number of these have been synthesized, usually by reaction of the halides with the ligand in a non-polar solvent like MeCN or acetone, which will form a labile complex such as [UCl4(MeCN)4] that will undergo ready substitution by a stronger donor  

Although sometimes direct reaction with a liquid ligand is possible  

ThCl4 + 3 Mc3N ThCl4(Me3N)3 UCI4 + 2 MesN UCl4(Me3N)2 

Reproduced with permission from JCS Dalton, (1975) 1875. G. Bombieri et al. Copyright (1975) RSC. 

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