Macroheterocycles. 46. Complexing properties of bis(benzo-15-crown-5) with acylhydrazide fragments in the linking chain

Complex stability of bis(benzo-15-crown-5) with acylhydrazide fragments in the linking chain with Na +, K +, Rb + and Cs + in 95% aqueous methanol has been determined by spectrophotometric titrations. In all cases the formation of 1:1 complexes was observed. The studied bis-crown ethers form more st...

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Published inInorganica Chimica Acta Vol. 155; no. 1; pp. 35 - 37
Main Authors Lukyanenko, N.G., Nazarova, N.Yu, Vetrogon, V.I., Holdt, H.-J., Aurich, J., Kuntosch, G.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 02.01.1989
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Summary:Complex stability of bis(benzo-15-crown-5) with acylhydrazide fragments in the linking chain with Na +, K +, Rb + and Cs + in 95% aqueous methanol has been determined by spectrophotometric titrations. In all cases the formation of 1:1 complexes was observed. The studied bis-crown ethers form more stable complexes than benzo-15-crown-5. The stability of bis-crown ethers complexes is substantially determined by the length of the linking chain. Bis-crown ethers with a glutaric acid residue in the linking chain exhibit striking potassium selectivity. High selectivity and stability of the complexes are due to the increase of their sandwich structure rigidity resulting from the formation of H bonds between acylhydrazide fragments.
ISSN:0020-1693
1873-3255
DOI:10.1016/S0020-1693(00)89279-8