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• W3184907418 abstract "On-surface Ullmann coupling has attracted intensive attentions recently owing to its uniqueness at the tailor-made fabrication of conjugated nanostructures with high controllability. However, in-depth understanding of reaction mechanisms has not been fully established yet. Herein, symmetrical dehalogenation of 2, 7-dibromopyrene (Br2Py) on Cu(1 1 1) has been investigated in-detail via a combination of scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory. First, deposition of Br2Py onto the precooled Cu(1 1 1) results in the self-assembly of intact precursors, while the formation of organometallic (OM) chains is induced on Cu(1 1 1) kept at room temperature (RT) after symmetrical dehalogenation due to the relatively high reactivity of Cu at RT. Further, it has been intriguingly discovered that symmetrically debrominated residues can be bound either to copper atoms from substrate leading the formation of close packed species, or to surface adatoms forming the Kagome-like pattern when Cu(1 1 1) is held at elevated temperatures during deposition. Nevertheless, covalent organic chains are constructed ultimately from different OM intermediates after stepwise annealing with the fingerprint of structural transition clearly identified. Based on these findings, our report provides appealing insights for the comprehensive understanding of surface Ullmann coupling mechanisms." @default.
• W3184907418 created "2021-08-02" @default.
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• W3184907418 date "2021-11-01" @default.
• W3184907418 modified "2023-10-16" @default.
• W3184907418 title "Symmetrical dehalogenation of 2, 7-dibromopyrene on Cu(1 1 1) with tunable intermediates and reaction paths" @default.
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• W3184907418 doi "https://doi.org/10.1016/j.apsusc.2021.150663" @default.
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