Alkali-metal ion complexation with lariat ethers possessing a chromogenic group.
The extraction and complexation abilities of chromogenic alkyl crown-ether reagents were compared with those of their chromogenic benzo crown ether analogues. Improvements in the extraction efficiency and stability of the complexes were observed, and can be attributed to various factors such as increased lipophilic character and decreased charge separation. The spectral separation caused by the deprotonation of the amine-group was significantly decreased, so the usefulness of these compounds will be limited, until improved spectral separation can be achieved.
Bubnis
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BP
Department of Chemistry, Miami University, Oxford, Ohio 45056, U.S.A.
Pacey
G E
GE