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A circular dichroism study of valinomycin barium ion complex

โœ Scribed by S. Devarajan; K. R. K. Easwaran

Publisher
Wiley (John Wiley & Sons)
Year
1981
Tongue
English
Weight
475 KB
Volume
20
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

Abstract

Complex formation of valinomycin with Ba^2+^ ions was investigated by circular dichroism spectroscopy. The results indicated that Ba^2+^ forms entirely different types of complexes when compared with K^+^. The data with perchlorate salt showed evidence for the formation of less stable V~2~C (peptide sandwich), VC (1:1), and VC~2~ (ion sandwich) complexes followed by a stable final complex upon gradual addition of salt (V stands for valinomycin and C for the cation). This final complex possibly has a flat structure with no internal hydrogen bonds, similar to that of valinomycin in highly polar solvents. The possible complexation mechanism and the role played by anions and isopropyl side chains are highlighted.

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