Raman Spectroscopic study of valinomycin-metal complexes

Liddle, W Kevin and Willis, Todd W and Tu, Anthony T and Sankaram, MB and Devarajan, S and Easwaran, KRK (1985) Raman Spectroscopic study of valinomycin-metal complexes. In: Chemistry and Physics of Lipids, 36 (4). pp. 303-308.

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Abstract

Valinomycin, an ionophore of considerable interest for its ion selectivity, and its K+, Mg2+, Ba2+, and Ca2+ complexes were studied by Raman spectroscopy. Each complex has a characteristic spectrum which differs from that of uncomplexed valinomycin, suggesting several distinct structures for each of the metal-valinomycin complexes. The biologically active potassium complex shows the most significant changes in its spectrum, especially in the intensity of the symmetric C---H stretching vibration of CH3 and the convergence of the two ester carbonyl stretching vibration bands into one complex formation. These results are due to the unique orientation of the ester carbonyl groups toward the caged potassium ion and the resulting more free rotation of isopropyl side chains. The divalent cation-valinomycin complexes examined showed spectra which differed in each case uniquely from both valinomycin and its complex with potassium.

Item Type:	Journal Article
Publication:	Chemistry and Physics of Lipids
Publisher:	Elsevier Science
Additional Information:	The copyright of this article belongs to Elsevier Science.
Keywords:	Raman spectroscopy;valinomycin metal complexes;ionophore
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited:	24 Nov 2009 11:08
Last Modified:	19 Sep 2010 05:35
URI:	http://eprints.iisc.ac.in/id/eprint/21025

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