Ultrasonic Absorption Kinetic Studies of the Complexation of Aqueous Potassium and Cesium Ions by 18-crown-6.
Abstract
Reaction rate constants for a rapid conformational rearrangement of aqueous 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) and its slower complexation of potassium ions at 25C in aqueous solutions have been determined from ultrasonic absorption data covering the 9-340 MHz frequency range. A concentration independent absorption with a maximum at about 100 MHz occurs in aqueous solutions of 18-crown-6 with no alkali metal cations present. This relaxation was attributed to a conformational rearrangement of the crown ether. Complexation of aqueous potassium ion by the polyether was then investigated kinetically at various polyether and potassium ion concentrations. These data, together with the conformational rearrangement data, were analyzed in terms of two step mechanism.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 10, 1975
- Accession Number
- ADA015279
Entities
People
- Edward M. Eyring
- Gerard W. Liesegang
- Michael M. Farrow
- Neil Purdie
Organizations
- University of Utah