Are Single Molecular Wires Conducting?

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Science  22 Mar 1996:
Vol. 271, Issue 5256, pp. 1705-1707
DOI: 10.1126/science.271.5256.1705


Molecular wire candidates inserted into “nonconducting” n-dodecanethiol self-assembled monolayers on Au{111} were probed by scanning tunneling microscopy (STM) and microwave frequency alternating current STM at high tunnel junction impedance (100 gigohms) to assess their electrical properties. The inserted conjugated molecules, which were 4,4′-di(phenylene-ethynylene)benzenethiolate derivatives, formed single molecular wires that extended from the Au{111} substrate to about 7 angstroms above and had very high conductivity as compared with that of the alkanethiolate.