Introduction of [2]catenanes into Langmuir films and Langmuir-Blodgett multilayers. A possible strategy for molecular information storage materials

Christopher L. Brown, Ulrich Jonas, Jon A. Preece, Helmut Ringsdorf, Markus Seitz, J. Fraser Stoddart

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The formation of Langmuir films comprised of (i) dimyristoylphosphatidic acid and a [2]catenane composed of a bisparapheylene-34-crown-10 with its two π-electron-rich hydroquinone rings and the π-electron-deficient cyclophane bis(paraquat-p-phenylene) and (ii) dimyristoylphosphatidic acid and a [2]catenane composed of a macrocyclic polyether containing two hydroquinone rings and an azobenzene unit and the π-electron-deficient cyclophane bis(paraquat-p-phenylene), has been achieved. Utilizing Π-A isotherms and isochore measurements, it is possible to determine the optimum ratio of phospholipid to [2]catenane for good Langmuir film formation and to interpret these experimental findings in terms of intermolecular π-π interactions between the [2]catenane tetracations in the Langmuir films. They have been transferred via the Langmuir-Blodgett technique to hydrophobized quartz supports, and, through a combination of UV-vis spectroscopy and small-angle X-ray scattering (SAXS), it has been established that the Langmuir films are deposited onto the support without loss of the [2]catenane tetracations (UV-vis) and that the transfer results in a periodic layer structure (SAXS) commensurate with the expected bilayer thickness of the phospholid and the [2]catenane. It is proposed that such films containing mechanically interlocked molecules, which have switchable characteristics, at least in the solution state, may be suitable candidates for spatially addressable information storage materials.

Original languageEnglish (US)
Pages (from-to)1924-1930
Number of pages7
JournalLangmuir
Volume16
Issue number4
DOIs
StatePublished - Feb 22 2000

ASJC Scopus subject areas

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

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