An effective non-chromatographic method for the purification of phenanthrolines and related ligands
2020
Ferretti, Francesco | Ragaini, Fabio
1,10-Phenanthrolines are widely employed as ligands, but their use on a large scale is constrained by their difficult purification, which usually requires lengthy chromatographic separations. Herein, we describe a purification strategy that takes advantage of the high stability and low solubility of phenanthroline complexes to separate them from the by products of their synthesis. The formation of ZnCl₂ complexes was employed, from which the free ligand can be recovered by reaction with aqueous NH₃ in a biphasic CH₂Cl₂/H₂O system. The same strategy was also successfully employed to purify related quinolino-guanidine ligands, demonstrating that the procedure is of general applicability.
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