Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 49, Pages 16030-16035Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808640
Keywords
C-C coupling; graphene nanoribbons; porphyrins; scanning probe microscopy; surface chemistry
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Funding
- Munich Center for Advanced Photonics (MAP), TUM-IAS
- ERC [247299]
- European Research Council Consolidator Grant NanoSurfs [615233]
- DFG via a Heisenberg professorship
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The templated synthesis of porphyrin-based oligomers and heterosystems is of considerable interest for materials with tunable electronic gaps, photovoltaics, or sensing device elements. In this work, temperature-induced dehydrogenative coupling between unsubstituted free-base porphine units and their attachment to graphene nanoribbons on a well-defined Ag(111) support are scrutinized by bond-resolved scanning probe microscopy techniques. The detailed inspection of covalently fused porphine dimers obtained by invacuo on-surface synthesis clearly reveals atomistic details of coupling motifs, whereby also putative reaction intermediates are identified. Moreover, the covalent attachment of porphines at preferred locations of atomically precise armchair-type graphene nanoribbons is demonstrated.
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