On the synthesis of alkali ad alkaline earth metal complexes of open and closed cryptands
Date
1996
Authors
Yokota, Yasuno
Major Professor
Advisor
Verkade, John G.
Committee Member
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Abstract
A group of diazapolyoxa-macrobicyclic compounds, "Cryptands" have a strong tendency to form complexes or inclusion compounds with alkali and alkaline earth metal cations. With their selective binding of certain of these cations, cryptands have been used as superior and selective complexing agents in water and also used as models for carrier molecules in the study of active ion transport phenomena in biological systems. Open chain (acyclic) cryptands are also alkali and alkaline earth metal complexing reagents and have been widely used as phase transfer catalysts.
Our initial goal was to obtain the shortest chain tripodal open cryptands possible with alkyl substituents at the end of the arm, and investigate their ability to complex metal cations. We obtained the target molecules by a simple synthetic route which employed easily available chemicals. The structure, stability and spectroscopic data for complexes obtained with these ligands were compared with those of crown ethers, open-chain analogs and TEA complexes which were recently obtained in our lab. In the course of our research, we accidentally obtained a homoleptic Li acetonitrile complex which will be described in the second paper within this thesis.
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thesis