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Bottom‐up Fabrication and Atomic‐Scale Characterization of Triply Linked, Laterally π‐Extended Porphyrin Nanotapes **
Author(s) -
Sun Qiang,
Mateo Luis M.,
Robles Roberto,
Lorente Nicolas,
Ruffieux Pascal,
Bottari Giovanni,
Torres Tomás,
Fasel Roman
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202105350
Subject(s) - diradical , characterization (materials science) , unpaired electron , intermolecular force , homo/lumo , porphyrin , materials science , atomic units , scanning electron microscope , crystallography , chemistry , nanotechnology , chemical physics , molecule , photochemistry , physics , atomic physics , singlet state , organic chemistry , quantum mechanics , excited state , composite material
Porphyrin nanotapes (Por NTs) are promising structures for their use as molecular wires thanks to a high degree of π‐conjugation, low HOMO—LUMO gaps, and exceptional conductance. Such structures have been prepared in solution, but their on‐surface synthesis remains unreported. Here, meso–meso triply fused Por NTs have been prepared through a two‐step synthesis on Au(111). The diradical character of the on‐surface formed building block PorA 2 , a phenalenyl π‐extended Zn II Por, facilitates intermolecular homocoupling and allows for the formation of laterally π‐extended tapes. The structural and electronic properties of individual Por NTs are addressed, both on Au(111) and on a thin insulating NaCl layer, by high‐resolution scanning probe microscopy/spectroscopy complemented by DFT calculations. These Por NTs carry one unpaired electron at each end, which leads to magnetic end states. Our study provides a versatile route towards Por NTs and the atomic‐scale characterization of such tapes.