Abstract
Ultrasonic relaxation spectra and infrared spectra (N-H stretch) are reported for the macrocycles 1,10-diaza-18-crown-6-(Kryptofix 22), monoaza-18-crown-6, and 18-crown-6 (18C6) and their complexes with Na + and Ag + in the solvent propylene carbonate (PC) at 25 o C. The relaxation spectra are attributed to intramolecular conversions on the microsecond to nanosecond time scale between various conformers of the macrocyclic ligands
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