Five diamidodiamino compounds, N, N′-bis [2-(dimethylamino) ethyl] propanediamide dihydrochloride L2· 2HCl, N, N′-bis [2-(diethylamino) ethyl] propanediamide dihydrochloride (L5), N, N′-bis [2-(dimethylamino) ethyl]-and N, N′-bis [2-(diethylamino) ethyl]-ethanediamide (L1 and L4) and N, N′-bis [2-(dimethylamino) propyl] ethanediamide (L3), have been synthesized and characterized. Their acid–base behaviour and ...