ChemInform Abstract: Synthesis and Protonation Behavior of the Macrocyclic Ligand 1,4,7,13‐ Tetramethyl‐1,4,7,10,13,16‐hexaazacyclooctadecane and of Its Bicyclic Derivative 4,7,10,17,23‐Pentamethyl‐1,4,7,10,13,17,23‐heptaazabicyclo( 11.7.5)pentacosane. A Potentiometric and 1H and 13C NMR Study. | Publicación