Molecular Dynamics of Macrocycle-Metal Ion Complexes Involving Heteronuclear Binding Atoms
Abstract
Combination of ultrasonic absorption relaxation spectra with infrared absorption spectra yields a clearer picture of the mechanism of complexation of metal ions by macrocycles in nonaqueous solutions. The Eigen-Winkler multistep reaction mechanism has consistently provided a suitable fit of the ultrasonic absorption data for systems such as monovalent sodium cation reacting with 18- crown-6 in acetonitrile. A macrocycle such as Kryptofix 22 having two nitrogen atoms in the ring experiences an exo-exo yields exo-endo yields endo-endo change in conformation readily detected by ultrasonic techniques. Differences in complexation-decomplexation mechanisms deduced from ultrasonic and NMR data can be rationalized in terms of the limitations of the experimental techniques. Ultrasonic absorption, Nonaqueous solutions, Krptofix 22, Crown ethers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 1989
- Accession Number
- ADA203437
Entities
People
- Edward M. Eyring
- Licesio J. Rodrigez
- Meizhen Xu
- Sergio Petrucci
Organizations
- University of Utah