Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 11, Issue -, Pages 1068-1078Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.11.120
Keywords
break junction measurements; charge-transfer complex; DFT-based transport; molecular electronics; tetrathiafulvalene
Categories
Funding
- European Commission (EC) [606728]
- European Research Council [ERC-436 2012 ADG_20120216-Chirallcarbon]
- CAM [S2013/MIT-2841, S2013/MIT-2850, S2013/MIT-3007]
- FP7-ENERGY-2012-1-2STAGE (PHOCS) [309223]
- Spanish MICINN/MINECO [MAT2011-25046, MAT2014-57915-R, PRI-PIBUS-2011-1067]
- Japan Society for Promotion of Science (JSPS) [FY2012 (P12501), 24.02501]
- KAKENHI [25110009]
- Spanish MICINN [MAT2011-23627]
- Carl-Zeiss foundation
- Collaborative Research Center 767 Controlled Nanosystems: Interaction and Interfacing to the Macroscale
- Grants-in-Aid for Scientific Research [25110009] Funding Source: KAKEN
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We describe the synthesis and single-molecule electrical transport properties of a molecular wire containing a p-extended tetrathiafulvalene (exTTF) group and its charge-transfer complex with F(4)TCNQ. We form single-molecule junctions using the in situ break junction technique using a homebuilt scanning tunneling microscope with a range of conductance between 10 G(0) down to 10(-7) G(0). Within this range we do not observe a clear conductance signature of the neutral parent molecule, suggesting either that its conductance is too low or that it does not form a stable junction. Conversely, we do find a clear conductance signature in the experiments carried out on the charge-transfer complex. Due to the fact we expected this species to have a higher conductance than the neutral molecule, we believe this supports the idea that the conductance of the neutral molecule is very low, below our measurement sensitivity. This idea is further supported by theoretical calculations. To the best of our knowledge, these are the first reported single-molecule conductance measurements on a molecular charge-transfer species.
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