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@article{faucris.118149284,
abstract = {We demonstrate the on-surface synthesis of porous carbon nanoribbons on Ag(111) via a preprogrammed isomerization of conformationally flexible polymer chains followed by dehydrogenation reactions using thermal annealing. The carbon chains are fabricated by polymerization of prochiral 1,3,5-tris(3-bromophenyl)benzene (mTBPB) directly on the surface using an Ullmann-type reaction. At room temperature, mTBPB partially self-assembles in halogen-bonded 2D networks, which transform into organometallic chains and rings after debromination. The chain and ring formation is facilitated by conformational switching from a C3h to Cs symmetry of mTBPB via rotation of m-phenylene units. The high conformational selectivity toward Cs-conformers is templated by the twofold coordination to Ag adatoms. After thermally induced covalent-linking through aryl–aryl coupling, well-ordered nanoporous chains are created. Finally, the rotation of single phenylene units in combination with dehydrogenation cross-linking reactions within the polymer chains leads to the unexpected formation of porous carbon nanoribbons. We unveil the reaction mechanism in a low-temperature scanning tunneling microscopy study and demonstrate that the rotation of m-phenylene units is a powerful design tool to promote structural control in the synthesis of cyclic covalent organic nanostructures on metal surface},
author = {Ammon, Maximilian Michael and Sander, Tim and Maier, Sabine},
doi = {10.1021/jacs.7b04783},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {12976–12984},
peerreviewed = {Yes},
title = {{On}-{Surface} {Synthesis} of {Porous} {Carbon} {Nanoribbons} from {Polymer} {Chains}},
url = {http://pubs.acs.org/doi/abs/10.1021/jacs.7b04783},
volume = {139},
year = {2017}
}