Me3In has been synthesised in a hydrocarbon solvent and has then been adduct purified using the nitrogen donor ligand 4,4'-methylenebis-(N,N'-dimethylaniline) (MBDA). The exclusion of ether from the synthesis and purification route leads to an ultra-low oxygen grade of Me3In which allows the growth of InAlGaAs GRINSCH laser structures with high FL, intensity. The crystal structures of the Me3In[MBDA](2) and (Me3In)(2) [MBDA] adducts are reported for the first time.