As previously noted in Table , upon mixing CeF4 with a ligand and a base in acetonitrile, the colour of the acetonitrile solution turned from colourless (for the individual components) to various shades depending on the ligand species. However, due to the low solubility of CeF4 in acetonitrile and the high extinction coefficient of benzoic acid or aromatic phosphate 7 itself, it was not possible to isolate and analyse in-situ formed lanthanoidligand complexes using UV/Vis spectroscopy. Spectrum 2. top: CeF4 (0.0278 M) in acetonitrile and CeF4 and KSCN in a 1:2 mixture in 3 mL acetonitrile (c = 0.278 M). bottom: UV/Vis spectrum (left) and emission spectrum (right) of Ce(SCN)3 as reported in ref [47]. Reprint permission from John Wiley and Sons. f Salen-type ligand (10 mol%) 0 g DMSO (1 mL) 0 h KSCN (10 mol%) 0 i LiNO3 (10 mol%) 0 j TBAI (10 mol%) 0 k Na2S (10 mol%) 0