Synthesis and protonation behaviour 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

1. Bencini, A.
2. Bianchi, A.
3. Garcia-España, E.
4. Fusi, V.
5. Micheloni, M.
6. Paoletti, P.
7. Ramirez, J.A.
8. Rodriguez, A.
9. Valtancoli, B.