Ultrasonic Absorption Kinetic Studies of the Complexation of Aqueous Li+, Na+, Rb+, Tl+, Ag+, NH(4)+, and Ca(super 2)+ by 18-Crown-6.
Abstract
The complexation-decomplexation reaction kinetics of the macrocyclic polyether 18-crown-6 (1,4,7,10,13,16-hexaoxacylooctadecane) with the aqueous cations Li(+), Na(+), Rb(+), Tl(+), Ag(+), NH4(+) and Ca(2+) have been determined from acousto-optic ultrasonic absorption data covering the 15-205 MHz frequency range, at 25C. These data, together with a previously reported crown ether conformational change, were analyzed in terms of a multistep mechanism that admits the possibility of water loss or conformational changes but not diffusion as being rate limiting. The complexation rate constants follow the trend Ca(2+) then Li(+) < Na(+) < K(+) then Cs(+) then Rb(+) < NH4(+) < Tl(+) < Ag(+).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA029675
Entities
People
- Edward M. Eyring
- F. Arce Vazquez
- Gerard W. Liesegang
- Michael M. Farrow
- Neil Purdie
Organizations
- University of Utah