A benzimidazole functionalised DO3A chelator showing pH switchable coordination modes with lanthanide ions. - Fisher, Christopher M.; Fuller, Euan; Burke, Benjamin P.; Mogilireddy, Vijetha; Pope, Simon J. A.; Sparke, Amanda E.; Déchamps-Olivier, Isabelle; Cadiou, Cyril; Chuburu, Françoise; Faulkner, Stephen; Archibald, Stephen J. (Dalton Transactions: An International Journal of Inorganic Chemistry, 2014)