Abstract
Although the tetrapyrrolic macrocycle system provides a promising platform for building molecular devices, investigating the relationship between the conductance and the substituents is still a challenge. Here, three A2B type corroles with the substituents exhibiting electron-withdrawing and electron-donating effects on B-site are prepared. The single-molecule conductance results via the scanning tunneling microscope break junction (STM-BJ) technique demonstrate that the single-molecule conductance of corroles is suppressed by the electron-withdrawing substituent while it is enhanced by the electron-donating substituent, which is attributed to the change of the energy gap between the HOMO and LUMO.
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