2008
DOI: 10.1021/ja802281c
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Single Molecule Conductance of Porphyrin Wires with Ultralow Attenuation

Abstract: A series of thioacetate-terminated butadiyne-linked porphyrin oligomers have been synthesized with one to three porphyrin repeat units. Single molecule electrical scanning tunneling microscopy measurements using the I(s) and I(t) methods were used to determine the molecule conductances for this series of oligomers. The molecular conductance shows an exponential falloff with sulfur-sulfur distance with a remarkably low attenuation factor of beta = (0.04 +/- 0.006) A-1.

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Cited by 237 publications
(250 citation statements)
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“…Wires up to 5 nm incorporating Zn porphyrins were also found to display very low attenuation factors (0.4 nm −1 ). 8 …”
Section: Molecular Junctions With Metal Complexesmentioning
confidence: 99%
“…Wires up to 5 nm incorporating Zn porphyrins were also found to display very low attenuation factors (0.4 nm −1 ). 8 …”
Section: Molecular Junctions With Metal Complexesmentioning
confidence: 99%
“…2 Studies on various -conjugated molecules have been performed. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The molecules, with delocalized electrons due to sp 2 hybridized carbon atoms, exhibit a smaller energy gap between the highest occupied molecular orbital ͑HOMO͒ and the lowest unoccupied molecular orbital ͑LUMO͒. For -conjugated molecules longer than ϳ3 nm hopping conduction was observed.…”
Section: Electrical Characteristics Of Conjugated Self-assembled Monomentioning
confidence: 99%
“…1); electron-donating substituents (Me−, MeO−) resulted in significantly higher junction conductances and the electron-deficient C 6 F 4 group resulted in a lower conductance [18]. Many studies of metal-molecule-metal junctions have probed the molecular structural requirements for obtaining high junction conductance [19][20][21][22][23][24][25][26][27][28].…”
Section: Introductionmentioning
confidence: 99%