Self-organization of hydrogen-bonded optically active phthalocyanine dimers

Mutsumi Kimura, Takahisa Kuroda, Kazuchika Ohta, Kenji Hanabusa, Hirofusa Shirai, Nagao Kobayashi

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

Zinc(II) phthalocyanines 4 and 5 decorated with six optically active alkyl chains and one chial diol were synthesized from two phthalonitriles using mixed tetramerization reactions. Self-organizing properties of these complexes and related compounds 3, 6, and 7 in CHCl3 solution and thin film were studies by UV-vis, Fourier transform infrared (FT-IR), circular dichroism (CD), vapor pressure osmometeric, and powder X-ray diffraction (XRD) measurements. Zinc phthalocyanines having a chiral diol formed an optically active dimer in CHCl3 solution through the formation of an intermolecular hydrogen bond between two diol groups. Differential scanning calorimetry, temperature-controlled FT-IR, UV-vis, XRD, and CD measurements for thin films indicated that 4 and 5 organized into two different structures, depending on the temperature. At room temperature, the polymeric hydrogen bond among the diol groups allowed the construction of a lamellar sheet. However, the cleavage of a hydrogen-bond network above 130°C caused the structure to change to a hexagonal columnar phase, in which zinc phthalocyanine molecules are arranged in a left-handed helix.

Original languageEnglish
Pages (from-to)4825-4830
Number of pages6
JournalLangmuir
Volume19
Issue number11
DOIs
Publication statusPublished - 2003 May 27

ASJC Scopus subject areas

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

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