Tetradentate bis-phosphine ligands (P2N2 and P2S2) and their Rh(III), Ni(II) and 105Rh Complexes: X-ray crystal structures of trans-[RhCl2(L2)]PF6, [Ni(L2)](PF6)2 and μ-O2SO2-[Ni(L5)]2(PF6)2

Phosphine-containing ligands allowed for lower temperatures and lower ethanol concentrations in the formulations for 105Rh(L) complexation, but at the expense of higher ligand concentrations.