Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

Perrin, Mickael L.; Prins, Ferry; Martin, Christian A.; Shaikh, Ahson Jabbar; Eelkema, Rienk; Esch, Jan H. van; Břı́za, Tomáš; Kaplánek, Robert; Král, Vladimír; Ruitenbeek, J. M. van; Zant, Herre S. J. van der; Dulić, Diana

doi:10.1002/anie.201104757

Cited by 58 publications

(38 citation statements)

References 26 publications

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“…A two dimensional conductance–distance histogram constructed with traces featuring Ni(nor) molecular plateaus extracted from the same data set reveals junction lengths of ∼0.8–1.0 nm (Fig. 2b; Supplementary Figs 6 and 7), ruling out the possibility of molecular junctions being formed perpendicularly to the norcorrole plane26. Slightly longer junction dimensions of ∼1.0–1.2 nm were typically observed for Ni(porph) (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 79%

Highly-conducting molecular circuits based on antiaromaticity

et al. 2017

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Aromaticity is a fundamental concept in chemistry. It is described by Hückel’s rule that states that a cyclic planar π-system is aromatic when it shares 4n+2 π-electrons and antiaromatic when it possesses 4n π-electrons. Antiaromatic compounds are predicted to exhibit remarkable charge transport properties and high redox activities. However, it has so far only been possible to measure compounds with reduced aromaticity but not antiaromatic species due to their energetic instability. Here, we address these issues by investigating the single-molecule charge transport properties of a genuinely antiaromatic compound, showing that antiaromaticity results in an order of magnitude increase in conductance compared with the aromatic counterpart. Single-molecule current–voltage measurements and ab initio transport calculations reveal that this results from a reduced energy gap and a frontier molecular resonance closer to the Fermi level in the antiaromatic species. The conductance of the antiaromatic complex is further modulated electrochemically, demonstrating its potential as a high-conductance transistor.

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Section: Resultsmentioning

confidence: 79%

Highly-conducting molecular circuits based on antiaromaticity

et al. 2017

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“…[20, 41,42,[57][58][59][60] Yoon et al and Kang et al constructed arrays of small (but indeterminate) numbers of porphyrin molecules bridging gold nanoelectrodes and measured their I-V response. [41,42] More recently it has become possible to measure the single-molecule conductance of porphyrin molecular wires, which have been trapped between gold contacts in an STM break-junction configuration.…”

Section: Doi: 101002/adma201103109mentioning

confidence: 99%

Comparison of the Conductance of Three Types of Porphyrin‐Based Molecular Wires: β,meso,β‐Fused Tapes, meso‐Butadiyne‐Linked and Twisted meso‐meso Linked Oligomers

et al. 2011

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The length dependence of charge transport is evaluated in three families of porphyrin-based wires. Planar edge-fused tapes and alkyne-linked oligomers mediate efficient charge transport with exceptionally shallow distance dependence, whereas the conductances of the twisted singly linked chains decrease steeply with increasing oligomer length. The planar tapes are more conjugated than the alkyne-linked oligomers, but these two types of wires have similar conductance attenuation factors.

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“…27 Importance of the contact geometry for the transport properties has been shown for many systems. 10,[37][38][39][40] Moreover, the properties of the junction may also depend on the CNT chirality, thus, all carbon electrodes considered in this work are of the zigzag type -the most effective form for the switches. 41 Following the work by Staykov et al, 30 we simulate transport in various structural connections to the leads: para, meta, and not studied earlier ortho -all displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

Contacts for organic switches with carbon-nanotube leads

Wierzbowska¹,

Rode²,

Sadek³

et al. 2015

Nanotechnology

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We focus on two classes of organic switches operating due to the photo- or field-induced proton transfer (PT) process. By means of first-principles simulations, we search for the atomic contacts that strengthen diversity of the two swapped current-voltage (I-V) characteristics between two tautomers. We emphasize that the low-resistive contacts do not necessarily possess good switching properties. Very often, the higher-current flow makes it more difficult to distinguish between the logic states. Instead, the more resistive contacts multiply a current gear to a larger extent. The low- and high-bias work regimes set additional conditions, which are fulfilled by different contacts: (i) in the very low-voltage regime, the direct connections to the nanotubes perform better than the popular sulfur contacts, and (ii) in the higher-voltage regime, the best are the peroxide (-O-O-) contacts. Additionally, we find that the switching-bias value is not an inherent property of the conducting molecule, but it strongly depends on the chosen contacts.

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Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

Cited by 58 publications

References 26 publications

Highly-conducting molecular circuits based on antiaromaticity

Highly-conducting molecular circuits based on antiaromaticity

Comparison of the Conductance of Three Types of Porphyrin‐Based Molecular Wires: β,meso,β‐Fused Tapes, meso‐Butadiyne‐Linked and Twisted meso‐meso Linked Oligomers

Contacts for organic switches with carbon-nanotube leads

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