Synthesis and potentiometric selectivity study of new spiro-14-crown-4 derivatives |
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| Authors: | Yehia A. Ibrahim Ahmed H. M. Elwahy Hishmat R. Hanna Suzan K. Khella |
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| Affiliation: | Department of Chemistry, Faculty of Science , Cairo University , Giza, Egypt |
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| Abstract: | Abstract Four new compounds with 14-crown-4 attached to spirocyclopentane or spirocyclohexane were synthesized and tested for potentiometric selectivity for lithium ion in polyvinyl chloride membrane electrodes. Four plasticizers were studied and the addition of tri-octylphosphine oxide (TOPO) was investigated. One ionophore exhibited a sodium/lithium selectivity, Kpot Li,Na by the matched potential method of 0.0028 in the presence of 1% TOPO, using o-nitro-phenylphenyl ether as plasticizer. Selectivities are reported for sodium, potassium, nickel, cobalt, barium and calcium. |
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| Keywords: | Azacalixarene azacyclophane hydrogen bond self-filled structure |
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