Bottom-up Fabrication and Atomic-scale Characterization of Triply-linked, Laterally π-Extended Porphyrin Nanotapes
Porphyrin nanotapes (Por NTs) have attracted vast interest
as potential molecular wires thanks to their exceptional electronic properties.
Recently, Por NTs have been synthesized by solution-based methods,
demonstrating high versatility and great potential for technological
applications. However, their synthesis is tedious and their characterization
limited by low solubility and stability. Here, we report the first example of
meso-meso triply-fused Por NTs, which are prepared from a readily available Por
precursor through a two-step synthesis on Au(111). 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 density functional theory calculations.