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We describe the synthesis and single molecule electrical transport propertiesof a molecular wire containing a ${\pi}$-extended tetrathiafulvalene (exTTF)group and its charge-transfer complex with F4TCNQ. We form single moleculejunctions using the in-situ break junction technique using a home-builtscanning tunneling microscope with a range of conductance between 10 G$_{0}$down to 10$^{-7}$ G$_{0}$. Within this range we do not observe a clearconductance signature of the neutral parent molecule, suggesting either thatits conductance is too low or that it does not form stable junctions.Conversely, we do find a clear conductance signature in the experiments carriedout on the charge-transfer complex. Due to the fact we expected this species tohave a higher conductance than the neutral molecule, we believe this supportsthe idea that the conductance of the neutral molecule is very low, below ourmeasurement sensitivity. This is further supported by our theoreticalcalculations. To the best of our knowledge, these are the first reported singlemolecule conductance measurements on a molecular charge-transfer species.

Single-molecule conductance of a chemically modified, {\pi}-extended tetrathiafulvalene and its charge-transfer complex with F4TCNQ