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O: Fachverband Oberflächenphysik
O 103: Poster Session VIII: Surface reactions II
O 103.2: Poster
Thursday, March 4, 2021, 13:30–15:30, P
On-surface synthesis of doubly-linked one-dimensional pentacene ladder polymer — •Kalyan Biswas1, José I. Urgel1, Ana Sánchez-Grande1, Shayan Edalatmanesh2, José Santos1, Borja Cirera1, Pingo Mutombo2, Koen Lauwaet1, Rodolfo Miranda1, Pavel Jelínek2, Nazario Martín1, and David Écija1 — 1IMDEA Nanoscience, 28049 Madrid, Spain — 2Institute of Physics of the Czech Academy of Science, CZ-16253 Prague, Czech Republic
π-conjugated polymers have received great attention in basic and applied research fields as promising new materials for the fabrication of semiconducting devices due to their unique electronic properties. The traditional solution synthesis of such material has been extended to the new synthetic discipline of on-surface synthesis, being based on the reaction of molecular precursors on surfaces in ultra-high vacuum conditions. Here, we provide a synthetic protocol toward the on-surface synthesis of ethynylene-like doubly-connected pentacene polymers by sublimation of pentacene derivatives with =CBr2 moieties and subsequent annealing on Au(111). The characterization of the polymers was performed by low-temperature scanning tunneling microscopy and non-contact atomic force microscopy, complemented with density functional theory calculations, revealing the formation of an unprecedented ethylene-like bridged pentacene ladder polymer. We envision that our study will be of general relevance for the synthesis and characterization of π-conjugated polymers opening new avenues with prospects for applications in molecular optoelectronics.