Electrostatic and Steric Effects in the Selective Complexation of Cations in Nonactin
- 6 June 1975
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 188 (4192) , 1027-1029
- https://doi.org/10.1126/science.188.4192.1027
Abstract
The ester carbonyl stretch frequencies of complexes of the macrotetrolide nonactin with Na + , K + , Rb + , Cs + , Tl + , NH 4 + , NH 3 OH + , and (NH 2 ) 2 CNH 2 + have been measured. For the larger alkali cations and the polyatomic cations, the ester carbonyl stretch frequency is linearly proportional to the cation-ester carbonyl electrostatic interaction energy. This constitutes direct evidence that the cation-nonactin interaction is primarily electrostatic, rather than mechanical (steric).Keywords
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