Molecular electronics: Some views on transport junctions and beyond

Joachim, Christian; Ratner, Mark A.

doi:10.1073/pnas.0500075102

Cited by 502 publications

(372 citation statements)

References 88 publications

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“…[154][156] [179] The concept of molecules as tailor made functional building blocks with atomic precision for electronic applications ranging from single molecules, [153] [253] through molecular devices, [254]- [258] to bulk materials leads to new challenges in organic chemistry. Of particular interest are conjugated systems as their delocalized electrons are expected to considerably favor electronic transport through their planer structures.…”

Section: Switchable Conducting Azo Biphenylsmentioning

confidence: 99%

Shape‐Switchable Azo‐Macrocycles

et al. 2009

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The synthesis of four shape‐switchable macrocycles comprising different peripheral substituents is described. The macrocycles 1–4 consist of m‐terphenyl semicircles interlinked by two azo joints. These macrocycles were assembled from nitro‐functionalized m‐terphenyl moieties through reductive dimerization. The semicircles were assembled through Suzuki cross‐coupling reactions. The molecular weights of the macrocycles were determined by vapour pressure osmometry, because mass spectrometry failed in the cases of 2 and 3. The E → Z photoisomerization reactions were analysed by UV/Vis spectroscopy complemented by 1H NMR studies. A very slow thermal back‐reaction indicated considerable stabilization of the Z isomer. The reduced efficiency of the thermal back‐reaction probably arises from the reduced degree of freedom due to the mechanical interlinking of the two azo groups. The photostationary state consisted of all‐Z (85 %) and all‐E isomers (15 %). The E → Z transformation induced by irradiation displayed simple exponential kinetics, which indicates pairwise switching of the two azo groups in a macrocycle, at least on the timescale under investigation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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Section: Switchable Conducting Azo Biphenylsmentioning

confidence: 99%

Shape‐Switchable Azo‐Macrocycles

et al. 2009

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“…Our main objective for using such a simplified description is to derive analytic expressions for the current which can be directly compared with those following from the scattering approach. Corrections related to important electron-vibration interactions result in some fine structures in the I-V-curves [16,19,20,22,26,[37][38][39][40] and are not considered here further. Therefore, the derived analytic results describe the coarsened I-V characteristics of the LMR-device with a single active MO.…”

Section: Model Set-up and Basic Equationsmentioning

confidence: 99%

Kinetic control of the current through a single molecule

et al. 2006

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A unified description is put forward for the electron transmission through a molecule that is attached to two leads with the molecule being characterized by a single level to be populated by the transferred electrons. In deriving the expression for the current the Coulomb interaction is accounted for between the two extra electrons that may occupy the molecular level. The formation of two distinct transmission channels associated with the neutral and the singly charged molecule can directly be related to this interaction. Moreover, each transmission channel comprises a sequential as well as a direct (tunneling) pathway. The first pathway is realized via hopping transitions between the molecule and the neighboring electrodes. Just this inelastic kinetic process is responsible for the kinetic charging of the molecule. Then, the second pathway takes place against the background of kinetic molecular charging. In particular, it is demonstrated that hopping transmissions which are asymmetric with respect to the two electrodes cause a kinetic current rectification. The transient population of the molecule, realized by the transferred electrons, determines the rectification; the latter becomes rather large for resonant transmission.

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“…Even these simple systems display spectroscopic and transistorlike properties such as rectification, amplification, and negative differential conductance. 3,22 The tunneling current/overpotential and tunneling current/bias voltage dependences have been recorded and compared with theoretical predictions. 14,[16][17][18][19][20] A particularly important observation is that the single-electron tunneling current/overpotential relation at fixed bias voltage, i.e., parallel variation of the electrochemical working electrode and tip potentials shows a maximum close to the electrochemical equilibrium potential of the redox molecule.…”

Section: Introductionmentioning

confidence: 99%

Coulomb repulsion effect in two-electron nonadiabatic tunneling through a one-level redox molecule

Кузнецов¹,

Medvedev²,

Ulstrup³

2009

The Journal of Chemical Physics

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We investigated Coulomb repulsion effects in nonadiabatic ͑diabatic͒ two-electron tunneling through a redox molecule with a single electronic level in a symmetric electrochemical contact under ambient conditions, i.e., room temperature and condensed matter environment. The electrochemical contact is representative of electrochemical scanning tunneling microscopy or a pair of electrochemical nanoscale electrodes. The two-electron transfer molecular system also represents redox molecules with three electrochemically accessible oxidation states, rather than only two states such as comprehensively studied. It is shown that depending on the effective Coulomb repulsion energy, the current/overpotential relation at fixed bias voltage shows two narrow ͑ϳk B T͒ peaks in the limit of strong electron-phonon coupling to the solvent environment. The system also displays current/bias voltage rectification. The differential conductance/bias voltage correlation can have up to four peaks even for a single-level redox molecule. The peak position, height, and width are determined by the oxidized and reduced states of both the ionization and affinity levels of the molecule and depend crucially on the Debye screening of the electric field in the tunneling gap.

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Molecular electronics: Some views on transport junctions and beyond

Cited by 502 publications

References 88 publications

Shape‐Switchable Azo‐Macrocycles

Shape‐Switchable Azo‐Macrocycles

Kinetic control of the current through a single molecule

Coulomb repulsion effect in two-electron nonadiabatic tunneling through a one-level redox molecule

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