Cation Binding in Nickel Pincer-Crown Ether Systems
Public Deposited- Last Modified
- February 26, 2019
- Creator
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Kerr, Stewart Heath
- Affiliation: College of Arts and Sciences, Department of Chemistry
- Abstract
- The cation binding properties of nickel complexes supported by pincer aza-crown ether aminophosphinite ligands (NCOP) of various sizes are explored. The binding stoichiometry of alkali metal cations interacting with the aza-crown ether is determined to be 1:1 through the method of continuous variations. A modified titration technique is used to gauge the relative interaction strength of alkali metals with the aza-crown ether. For the smaller 15-crown-5 aza-crown ether, the observed order of interaction strength is K+ ≈ Na+ < Li+. Comparisons between two Li+ salts seem to indicate that counter anion effects play a minimal role in cation binding, however, macrocycle size significantly affects cation interaction strength. For the larger 18-crown-6 aza-crown ether, it was observed that Na+ binds stronger than both Li+ and K+. Preliminary investigations into the reversible nature of cation interactions with the pincer aza-crown ether ligand demonstrate easy conversion between the strongly binding tridentate and weakly binding tetradentate regimes.
- Date of publication
- spring 2016
- Keyword
- DOI
- Resource type
- Rights statement
- In Copyright
- Note
- Funding: None
- Advisor
- Miller, Alexander
- Degree
- Bachelor of Science
- Honors level
- Honors
- Degree granting institution
- University of North Carolina at Chapel Hill
- Extent
- 35
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