Structural characterization of valinomycin and nonactin at the air-solution interface by grazing incidence X-ray diffraction

Hanna Rapaport, Ivan Kuzmenko, Kristian Kjaer, Paul Howes, Wim Bouwman, Jens Als-Nielsen, Leslie Leiserowitz, Meir Lahav

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Grazing incidence X-ray diffraction (GID) has been applied to the study of structural characteristics of two-dimensional crystallites of the ionophores valinomycin (VM) and nonactin (NA) when complexed with various cations at the air-solution interface. The VM complexes assume a bracelet shape that packs in a two-dimensional hexagonal unit cell. Other crystalline phases were formed on potassium iodide and barium perchlorate solutions. The presence of particular lipids induced ordered stacking of VM-potassium chloride complexes into three to four layers. NA packs in a pseudotetragonal unit cell on solutions of NH4SCN and KSCN. Upon compression of the NA-NH4SCN film, crystallites seven to eight layers thick were detected and the GID data enabled the determination of the structure. The tendency of these complexed ionophores to form multilayer crystallites at interfaces may have bearing on ion transport through membranes, via stacking.

Original languageEnglish
Pages (from-to)11211-11216
Number of pages6
JournalJournal of the American Chemical Society
Volume119
Issue number46
DOIs
StatePublished - 19 Nov 1997
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry

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