Dependence of single-molecule junction conductance on molecular conformation.
Saved in:
| Title: | Dependence of single-molecule junction conductance on molecular conformation. |
|---|---|
| Authors: | Venkataraman, Latha, Klare, Jennifer E., Nuckolls, Colin, Hybertsen, Mark S., Steigerwald, Michael L. |
| Source: | Nature. 8/24/2006, Vol. 442 Issue 7105, p904-907. 4p. 1 Chart, 3 Graphs. |
| Subjects: | Molecules, Scanning tunneling microscopy, Biphenyl compounds, Amines, Electron transport |
| Abstract: | Since it was first suggested that a single molecule might function as an active electronic component, a number of techniques have been developed to measure the charge transport properties of single molecules. Although scanning tunnelling microscopy observations under high vacuum conditions can allow stable measurements of electron transport, most measurements of a single molecule bonded in a metal–molecule–metal junction exhibit relatively large variations in conductance. As a result, even simple predictions about how molecules behave in such junctions have still not been rigorously tested. For instance, it is well known that the tunnelling current passing through a molecule depends on its conformation; but although some experiments have verified this effect, a comprehensive mapping of how junction conductance changes with molecular conformation is not yet available. In the simple case of a biphenyl—a molecule with two phenyl rings linked by a single C–C bond—conductance is expected to change with the relative twist angle between the two rings, with the planar conformation having the highest conductance. Here we use amine link groups to form single-molecule junctions with more reproducible current–voltage characteristics. This allows us to extract average conductance values from thousands of individual measurements on a series of seven biphenyl molecules with different ring substitutions that alter the twist angle of the molecules. We find that the conductance for the series decreases with increasing twist angle, consistent with a cosine-squared relation predicted for transport through π-conjugated biphenyl systems. [ABSTRACT FROM AUTHOR] |
| Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
|---|---|
| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 22063431 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Dependence of single-molecule junction conductance on molecular conformation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Venkataraman%2C+Latha%22">Venkataraman, Latha</searchLink><br /><searchLink fieldCode="AR" term="%22Klare%2C+Jennifer+E%2E%22">Klare, Jennifer E.</searchLink><br /><searchLink fieldCode="AR" term="%22Nuckolls%2C+Colin%22">Nuckolls, Colin</searchLink><br /><searchLink fieldCode="AR" term="%22Hybertsen%2C+Mark+S%2E%22">Hybertsen, Mark S.</searchLink><br /><searchLink fieldCode="AR" term="%22Steigerwald%2C+Michael+L%2E%22">Steigerwald, Michael L.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 8/24/2006, Vol. 442 Issue 7105, p904-907. 4p. 1 Chart, 3 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Molecules%22">Molecules</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+tunneling+microscopy%22">Scanning tunneling microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Biphenyl+compounds%22">Biphenyl compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Amines%22">Amines</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+transport%22">Electron transport</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Since it was first suggested that a single molecule might function as an active electronic component, a number of techniques have been developed to measure the charge transport properties of single molecules. Although scanning tunnelling microscopy observations under high vacuum conditions can allow stable measurements of electron transport, most measurements of a single molecule bonded in a metal–molecule–metal junction exhibit relatively large variations in conductance. As a result, even simple predictions about how molecules behave in such junctions have still not been rigorously tested. For instance, it is well known that the tunnelling current passing through a molecule depends on its conformation; but although some experiments have verified this effect, a comprehensive mapping of how junction conductance changes with molecular conformation is not yet available. In the simple case of a biphenyl—a molecule with two phenyl rings linked by a single C–C bond—conductance is expected to change with the relative twist angle between the two rings, with the planar conformation having the highest conductance. Here we use amine link groups to form single-molecule junctions with more reproducible current–voltage characteristics. This allows us to extract average conductance values from thousands of individual measurements on a series of seven biphenyl molecules with different ring substitutions that alter the twist angle of the molecules. We find that the conductance for the series decreases with increasing twist angle, consistent with a cosine-squared relation predicted for transport through π-conjugated biphenyl systems. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=22063431 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/nature05037 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 904 Subjects: – SubjectFull: Molecules Type: general – SubjectFull: Scanning tunneling microscopy Type: general – SubjectFull: Biphenyl compounds Type: general – SubjectFull: Amines Type: general – SubjectFull: Electron transport Type: general Titles: – TitleFull: Dependence of single-molecule junction conductance on molecular conformation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Venkataraman, Latha – PersonEntity: Name: NameFull: Klare, Jennifer E. – PersonEntity: Name: NameFull: Nuckolls, Colin – PersonEntity: Name: NameFull: Hybertsen, Mark S. – PersonEntity: Name: NameFull: Steigerwald, Michael L. IsPartOfRelationships: – BibEntity: Dates: – D: 24 M: 08 Text: 8/24/2006 Type: published Y: 2006 Identifiers: – Type: issn-print Value: 00280836 Numbering: – Type: volume Value: 442 – Type: issue Value: 7105 Titles: – TitleFull: Nature Type: main |
| ResultId | 1 |
