Macrocyclic Polycation Complexes for Secondary Anion Binding, Molecular Recognition, and Catalysis
Abstract
The objective of this research project is to synthesize binuclear cobalt(II) and copper (I) complexes of macrocyclic and macrobicyclic ligands, in which the metal ions are coordinated and held apart at distances such as to recognize and coordinate secondary bridging groups and by so doing activate the bridging groups for redox reactions or increasing the nucleophilic character of the groups to catalyze the rates of substitution reactions. The strengths of binding of the secondary bridging anions or molecules will depend on their ability to coordinate to the two metal centers simultaneously. In other words, the bridging groups should be the correct size and shape to coordinate the metal ions readily. The strength of binding of the secondary bridging groups will be determined from the equilibrium constants involving the combination of these groups with the metal ions, determined potentiometrically and spectrophotometrically. A specific purpose of this research project is to activate dioxygen by forming a binuclear (peroxo) complex in which the dioxygen is partially reduced and the metal ions are partly oxidized to the next higher valence state. The dioxygen is thus activated for reaction with a second reducing bridging group or an outside reductant which may be added to the system.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1992
- Accession Number
- ADA251069
Entities
People
- Arthur E. Martell
Organizations
- Texas A&M University