Entry Base Yield of 14 [%] from GC-MS a Na2CO3 (5 mol%) 80% b Na2CO3 (0.1 mmol, 1.0 equiv.) 37% c Cs2CO3 (5 mol%) 63% d Cs2CO3 (0.1 mmol, 1.0 equiv.) traces Yields were determined by GC-MS using isopropyl benzol (Cumol) as internal standard in 0. The spectral data are in accordance with literature reports about the tribromide salt. It has been documented in literature that excess coordination of (halide) ligands leads to an absorption shift of the resulting (anionic) metal complex (e.g. FeCl4 -or BiCl5 -) towards longer wavelengths. However, the attempt to coordinate different kinds of ligands simultaneously to the lanthanoid cation, aiming to shift the complex absorption to longer wavelengths and improve its solubility in acetonitrile, resulted in the complete loss of the ligand-to-metal charge transfer (LMCT) activity of the lanthanoid (Table ). We hypothesized that the added ligand in excess displaces benzoic acid. The addition of supplementary ligands may prevent the binding of the benzoate anion. Consequently, no benzoate radical could be formed via the desired light-induced bond-homolysis, resulting in the absence of product formation. The pseudohalide or oxoanionic ligands did not exhibit any synthetically productive LMCT activity when combined with CeF4 Table . Dual ligand system for the complexation with CeF4.