Hydrogen Bonds within an Ionic Environment: The Remarkable Behavior of the Zwitterion [CoIII(η5-C5H4COOH)(η5-C5H4COO)]

The organometallic zwitterion [Co III (η 5 -C 5 H 4 COOH)(η 5 -C 5 H 4 COO)] forms a hydrogen-bonded supramolecular adduct with the cationic acid [Co III (η 5 -C 5 H 4 COOH) 2 ] + in the solid state and shows self-organization around K + cations in the mixed system {[Co III (η 5 -C 5 H 4 COOH)(η 5 -C 5 H 4 COO)] 2 }[K] + [PF 6 ] - .