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.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces