Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures I
O 11.10: Vortrag
Montag, 12. März 2018, 17:45–18:00, MA 004
On-surface formation of cumulene by dehalogenative homocoupling — Bay Tran1, Qiang Sun2, •Mihaela Enache1, Liangliang Cai2, Honghong Ma2, Xin Yu2, Chunxue Yuan2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Groningen, Netherlands — 2Interdisciplinary Materials Research Center, Tongji University, Shanghai, China
Recently, on-surface synthesis based on the use of covalent linking has offered an excellent platform to construct novel 1D and 2D carbon-based materials. In particular, the thermally induced dehalogenation of pre-defined C-X groups (X = halogen) provides an efficient route to produce radicals for subsequent C-C couplings on the surface [1]. Until now, all employed halide precursors had only one halogen attached to a carbon atom. It is thus of interest to study the effect of attaching more than one halogen atom to a carbon atom with the aim of producing multiple unpaired electrons.
Herein, by introducing an alkenyl gem-dibromide, cumulene products were fabricated on an Au(111) surface by dehalogenative homocoupling reactions [2]. The reaction products and pathways were unambiguously characterized by the combination of high-resolution scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM) measurements together with density functional theory (DFT) calculations.
[1] B.V. Tran et al., Nanoscale, DOI : 10.1039/C7NR06187K
[2]Q. Sun et al., Angew. Chem. Int. Ed. 56, 12165-12169 (2017).