Single molecule conductance of porphyrin wires with ultralow attenuation.
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.
Sedghi
Gita
G
Chemistry Department, University of Liverpool, Liverpool L69 7ZD, UK.
Sawada
Katsutoshi
K
Esdaile
Louisa J
LJ
Hoffmann
Markus
M
Anderson
Harry L
HL
Bethell
Donald
D
Haiss
Wolfgang
W
Higgins
Simon J
SJ
Nichols
Richard J
RJ
D004553:Electric Conductivity; D004559:Electric Wiring; D016252:Microscopy, Scanning Tunneling; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry
D011166:Porphyrins; D013438:Sulfhydryl Compounds; D013455:Sulfur; C005732:thioacetic acid