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.
Chemistry Department, University of Liverpool, Liverpool L69 7ZD, UK.
Gita
G
Sedghi
Katsutoshi
K
Sawada
Louisa J
LJ
Esdaile
Markus
M
Hoffmann
Harry L
HL
Anderson
Donald
D
Bethell
Wolfgang
W
Haiss
Simon J
SJ
Higgins
Richard J
RJ
Nichols
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