Metal halide ligands include [TiCl4],  and [FeCl4] which are colorless tetrahedral and [CoCl4], and [NiCl4] which are blue tetrahedral.
[TiCl4] colourless tetrahedral [FeCl4] colourless tetrahedral [CoCl4] blue tetrahedral [NiCl4] blue tetrahedral 
