Binding of Alkali and Alkaline-Earth Cations to Monolayers of a Noncyclic Ionophore

Masayuki Yanagi, Hideo Tamamura, Kazue Kurihara, Toyoki Kunitake

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A new type of ionophore monolayer was prepared from 3,7-dioxaazelaamide derivatives: N,N′-dimethyl-N,N′-dioctadecyl- (la), N,N′-dimethyl-N,N′-dioctadecyl- (1b), and N,N,N′,N′-tetraoctadecyl-3,7-dioxaazelaamide (1c). Their monolayer properties have been studied by the surface pressure-area isotherm measurement, fluorescence microscopy, and surface reflection spectroscopy. By use of an anionic dye, 8-hydroxy-l,3,6-pyrenetrisulfonate ion, as counterion for metal cation, the ion binding characteristics of these ionophore monolayers were determined from reflection spectrum intensities. These monolayers bind Ca2+ ion effectively, and their affinities to metal cations depend on their chemical structures, being in the order of 1b > 1a > 1c. These different affinities can be interpreted in terms of the flexibility of the binding sites, which are regulated by alignment of long alkyl chains in monolayers.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalLangmuir
Volume7
Issue number1
DOIs
Publication statusPublished - 1991 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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