Structure and electrochemistry of self-organized fullerene - Lipid bilayer films

Takashi Nakanishi, Makoto Morita, Hiroto Murakami, Takamasa Sagara, Naotoshi Nakashima

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The unique properties of C60-bearing artificial lipids with three C16 (lipid 1), C14 (lipid 2), or C12 (lipid 3) alkyl chains have been characterized by a variety of techniques, including 13C NMR, UV/Vis, and FT-IR spectroscopies, differential scanning calorimetry (DSC), X-ray diffraction, and electrochemistry. The 13C NMR and UV/Vis spectra show that the lipids 1-3 have a closed aziridine structure at a 6/6-ring junction of C60. The DSC data reveal that cast films of 1 exhibit two endothermic peaks at temperature ranges of 35-40°C (main transition) and 47-49°C (subtransition) in air, water, and 0.5M aqueous tetraethylammonium chloride solution, while cast films of 2 and 3 each display one endothermic peak at 50-57°C. The results of temperature-dependent FT-IR and UV/Vis studies of cast films of 1-3, together with the above data, reveal that the main peak in the DSC thermogram of a film of 1 can be attributed to a typical phase transition as seen in lipid bilayer membranes, while the sub-endothermic peak seen with 1 and the peaks for 2 and 3 stem from a change in the orientation of the C60 moieties. X-ray diffraction patterns of each of the cast films of 1-3 show a diffraction peak corresponding to the (001) plane, suggesting the formation of molecular bilayer membrane structures. Cyclic voltammograms and Osteryoung square-wave voltammograms obtained from cast films of 1-3 on basal plane pyrolytic graphite (BPG) electrodes show strong temperature dependences. Finally, the thermodynamics of the binding of nine different alkylammonium ions and two alkylphosphonium ions to the electrogenerated radical monoanions and dianions of 1-3 cast on electrodes is described.

Original languageEnglish
Pages (from-to)1641-1648
Number of pages8
JournalChemistry - A European Journal
Volume8
Issue number7
DOIs
Publication statusPublished - Apr 2 2002

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Organic Chemistry

Fingerprint Dive into the research topics of 'Structure and electrochemistry of self-organized fullerene - Lipid bilayer films'. Together they form a unique fingerprint.

  • Cite this