Some known complexes have the following formulae: NbCl(MeS), NbCl(PPhMe), NbCl["o"-(AsMe)CH] (diars), NbCl[MeC(CHAsMe)] (triars), NbCl[PhPCHCHPPh] (diphos), NbCl[PhPMe], and yet other ligands such as 1,4-dioxane, diethyl ether, or the crown thioether (SCH) (which is violet).