Antamanide. Dynamics of Metal‐Complex Formation

Abstract

Overall rate constants for complex formation of Na + and Ca 2+ with antamanide and of Na + with perhydro‐antamanide were determined by using the temperature‐jump relaxation technique. Measurements were carried out in methanol or acetonitrile as solvents. Murexide was used as Na + ‐indicator. The reaction enthalpy of the Na + ‐antamanide system was determined from relaxation amplitudes. Values of the rate constants are considerably lower than those for similar macrocyclic complex‐forming compounds.