Multiple states of dimeric aggregates formed by (amido-ethynyl)helicene bidomain compound and (amido-ethynyl-amido)helicene tridomain compound

Wataru Ichinose, Masanori Shigeno, Masahiko Yamaguchi

研究成果: Article査読

13 被引用数 (Scopus)

抄録

An (amido-ethynyl)helicene bidomain compound and an (amido-ethynyl-amido) helicene tridomain compound were synthesized. The multidomain compounds were designed on the basis of previous findings that amido and ethynyl oligomers form dimeric aggregates with properties orthogonal to each other. Four aggregate states of multidomain compounds, namely, all-dimer, amido-dimer, ethynyl-dimer, and random-coil states, were obtained in different solvents, which were analyzed by circular dichroism (CD), UV/Vis, 1H NMR, and IR spectroscopy; vapor pressure osmometry (VPO); dynamic light scattering (DLS); and atomic force microscopy (AFM). The amido and ethynyl domains independently aggregated and disaggregated in a two-state manner. Reversible structural changes occurred for a tridomain compound between the ethynyl-dimer/random-coil state and the all-dimer/amido-dimer state with heating and cooling. Two structural change processes with different properties were obtained using a single compound. Domain switching! An (amido-ethynyl)helicene bidomain compound and an (amido-ethynyl-amido)helicene tridomain compound were synthesized. Four aggregate states of multidomain compounds, namely, all-dimer, amido-dimer, ethynyl-dimer, and random-coil states, were obtained in different solvents. Each domain independently aggregated and disaggregated in a two-state manner. Two different reversible structural changes occurred between the ethynyl-dimer/random-coil and the all-dimer/amido-dimer with heating and cooling.

本文言語English
ページ(範囲)12644-12654
ページ数11
ジャーナルChemistry - A European Journal
18
40
DOI
出版ステータスPublished - 2012 10 1

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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