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Top: Electrical properties of directly linked porphyrin wires across Au nanoelectrodes with spacing of less than 5 nm were prepared using an electromigration-induced break-junction technique Reproduced from ref. [141] with permission of the copyright holders. Bottom: an acetylene-linked porphyrin construct has been studied to look at distance dependence on the conductivity. Reproduced from ref. [36] with permission of the copyright holders.
