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Leary E, Kastlunger G, Limburg B, Rincón-García L, Hurtado-Gallego J, González MT, Bollinger GR, Agrait N, Higgins SJ, Anderson HL, Stadler R, Nichols RJ. Long-lived charged states of single porphyrin-tape junctions under ambient conditions. Nanoscale Horiz 2021; 6:49-58. [PMID: 33107543 DOI: 10.1039/d0nh00415d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The ability to control the charge state of individual molecules wired in two-terminal single-molecule junctions is a key challenge in molecular electronics, particularly in relation to the development of molecular memory and other computational componentry. Here we demonstrate that single porphyrin molecular junctions can be reversibly charged and discharged at elevated biases under ambient conditions due to the presence of a localised molecular eigenstate close to the Fermi edge of the electrodes. In particular, we can observe long-lived charge-states with lifetimes upwards of 1-10 seconds after returning to low bias and large changes in conductance, in excess of 100-fold at low bias. Our theoretical analysis finds charge-state lifetimes within the same time range as the experiments. The ambient operation demonstrates that special conditions such as low temperatures or ultra-high vacuum are not essential to observe hysteresis and stable charged molecular junctions.
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Affiliation(s)
- Edmund Leary
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
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Alanazy A, Leary E, Kobatake T, Sangtarash S, González MT, Jiang HW, Bollinger GR, Agräit N, Sadeghi H, Grace I, Higgins SJ, Anderson HL, Nichols RJ, Lambert CJ. Cross-conjugation increases the conductance of meta-connected fluorenones. Nanoscale 2019; 11:13720-13724. [PMID: 31298678 DOI: 10.1039/c9nr01235d] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Charge transport is strongly suppressed by destructive quantum interference (DQI) in meta-connected 1,1'-biphenyl-containing molecules, resulting in low electrical conductance. Surprisingly, we have found that DQI is almost entirely overcome by adding a bridging carbonyl, to yield a cross-conjugated fluorenone. This contrasts with other π-systems, such as para-connected anthraquinone, where cross-conjugation results in low conductance.
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Affiliation(s)
- Asma Alanazy
- The Department of Mathematics, Lancaster University, LA1 4YF, UK
| | - Edmund Leary
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, UK. and Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK. and Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Takayuki Kobatake
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Sara Sangtarash
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - M Teresa González
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Hua-Wei Jiang
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Gabino Rubio Bollinger
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Nicolás Agräit
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Hatef Sadeghi
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - Iain Grace
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - Simon J Higgins
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
| | - Harry L Anderson
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Richard J Nichols
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, UK. and Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
| | - Colin J Lambert
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
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García R, Herranz MÁ, Leary E, González MT, Bollinger GR, Bürkle M, Zotti LA, Asai Y, Pauly F, Cuevas JC, Agraït N, Martín N. Single-molecule conductance of a chemically modified, π-extended tetrathiafulvalene and its charge-transfer complex with F4TCNQ. Beilstein J Org Chem 2015. [PMID: 26199662 PMCID: PMC4505095 DOI: 10.3762/bjoc.11.120] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We describe the synthesis and single-molecule electrical transport properties of a molecular wire containing a π-extended tetrathiafulvalene (exTTF) group and its charge-transfer complex with F4TCNQ. 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 G0 down to 10(-7) G0. 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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Affiliation(s)
- Raúl García
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain
| | - M Ángeles Herranz
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain
| | - Edmund Leary
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
| | - M Teresa González
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
| | - Gabino Rubio Bollinger
- Departamento de Física de la Materia Condensada, and Instituto "Nicolás Cabrera", Universidad Autonoma de Madrid, E-28049 Madrid, Spain
| | - Marius Bürkle
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Linda A Zotti
- Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
| | - Yoshihiro Asai
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Fabian Pauly
- Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
| | - Juan Carlos Cuevas
- Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
| | - Nicolás Agraït
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain ; Departamento de Física de la Materia Condensada, and Instituto "Nicolás Cabrera", Universidad Autonoma de Madrid, E-28049 Madrid, Spain
| | - Nazario Martín
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain ; Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
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Scheer E, Agraït N, Cuevas JC, Yeyati AL, Ludoph B, Martín-Rodero A, Bollinger GR, van Ruitenbeek JM, Urbina C. The signature of chemical valence in the electrical conduction through a single-atom contact. Nature 1998. [DOI: 10.1038/28112] [Citation(s) in RCA: 555] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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