title: Three-Legged 2,2'-Bipyridine Monomer at the Air/Water Interface: Monolayer Structure and Reactions with Ni(II) Ions from the Subphase.
abstract: 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.
authors.affiliation: Laboratory of Polymer Chemistry, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
authors.forename: Wenyang
authors.initials: W
authors.lastname: Dai
authors.affiliation: Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay, CEA-Saclay , 91191 Gif-sur-Yvette Cedex, France.
authors.forename: Lay-Theng
authors.initials: LT
authors.lastname: Lee
authors.affiliation: Laboratory of Polymer Chemistry, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
authors.forename: Andri
authors.initials: A
authors.lastname: Schütz
authors.affiliation: Laboratory of Polymer Chemistry, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Zelenay
authors.affiliation: Laboratory of Polymer Chemistry, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: Empa, Swiss Federal Laboratories for Materials Science and Technology, Advanced Analytical Technologies, Überlandstrasse 129, 8600 Dübendorf, Switzerland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Borgschulte
authors.affiliation: Ion Beam Physics HPK H32, ETH Zurich , Otto-Stern-Weg 5, 8093 Zurich, Switzerland.
authors.forename: Max
authors.initials: M
authors.lastname: Döbeli
authors.affiliation: Physical Chemistry of Biosystems, Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany.
authors.forename: Wasim
authors.initials: W
authors.lastname: Abuillan
authors.affiliation: European Synchrotron Radiation Facility (ESRF), CS 40220, 38043 Grenoble Cedex 9, France.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Konovalov
authors.affiliation: Physical Chemistry of Biosystems, Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany.|Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University , Kyoto 606-8501, Japan.
authors.forename: Motomu
authors.identifier: 0000-0003-3663-9554
authors.initials: M
authors.lastname: Tanaka
authors.affiliation: Laboratory of Polymer Chemistry, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
authors.forename: A Dieter
authors.identifier: 0000-0001-9975-9831
authors.initials: AD
authors.lastname: Schlüter