AN IMPROVED ONE-STEP METHOD TO PREPARE SOME DIAZA-CROWN ETHERS AND THE CATION COMPLEXATION PROPERTIES OF 4,10-DIAZA-18-CROWN-6 WITH 2 TRANSITION METAL IONS

摘要

4,10-Diaza-15-crown-5, 4, 10-diaza-18-crown-6, 4,13-diaza-21-crown-7, and 4,16-diaza-24-crown-8 were prepared by an improved method from the appropriate oligothylene glycol diiodides and diamines. The thermodynamic values of log K, DELTAH and DELTAS for the interaction of 4,10-diaza-18-crown-6 with Pb2+ and Ag+ were determined by a calorimetric titration method and compared with thermodynamic values for interactions of 4,13-diaza-18-crown-6 with the same cations. The thermodynamic values were found to be different for the two diaza-crown ligands. 4,10-Diaza-18-crown-6 and its 4,13-diaza-crown analog formed precipitates when treated with Co2+, Cd2+, Cu2+, and Ni2+ so that no thermodynamic data are reported for these interactions. [References: 37]