Reversible Pyrrole-Based Proton Storage/Release in Ruthenium(II) Complexes

Newly designed ruthenium(II) complexes are reported which contain a pyridylpyrrole ligand featuring fast-responsive and reversible proton storage/release on the pyrrole group. The protonated pyrrolium acts as an acidic initiator and is capable of triggering the polymerization of 2,2-dimethyloxirane.