4.6 Article

Three-Legged 2,2'-Bipyridine Monomer at the Air/Water Interface: Monolayer Structure and Reactions with Ni(II) Ions from the Subphase

Journal

LANGMUIR
Volume 33, Issue 7, Pages 1646-1654

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b04282

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Funding

  1. Swiss National Science Foundation (SNSF)
  2. UZH-URPP program LightChEC
  3. World Premier International Research Center Initiative (WPI), MEXT, Japan
  4. Grants-in-Aid for Scientific Research [16KT0070] Funding Source: KAKEN

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The behavior of compound 2 [1,3,5-tri(2,2'bipyridin-5-yl)benzene] with three bipyridine units arranged in a star geometry is investigated in the presence and absence of Ni(ClO4)(2). Its properties at the air water interface as well as after transfer onto a solid substrate are studied by several techniques including Brewster angle microscopy, X-ray reflectivity, neutron reflectivity, X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and atomic force microscopy combined with optical microscopy. It is found that compound 2 within the monolayers formed stays almost vertical at the interface and that at high Ni2+/2 (Ni2+/2 = 4000, 20'000) ratios two of the three bipyridine units of 2 are complexed, resulting in supramolecular sheets that are likely composed of arrays of linear metal organic complexation polymers.

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