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Related Concept Videos

Electron Carriers01:24

Electron Carriers

85.5K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Carbocations02:10

Carbocations

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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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A Nanocar and Rotor in One Molecule.

Kwan Ho Au-Yeung1, Suchetana Sarkar1, Tim Kühne1

  • 1Center for Advancing Electronics Dresden, TU Dresden, 01062Dresden, Germany.

ACS Nano
|January 13, 2023
PubMed
Summary
This summary is machine-generated.

A single-molecule machine acts as a unidirectional rotor or a nanocar on a gold surface, controlled by its adsorption conformation. Surface coverage tunes its function, enabling directed movement via inelastic tunneling excitation.

Keywords:
density functional theoryinelastic tunneling electronsmolecular manipulationmolecule rotornanocarscanning tunneling microscopy

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Area of Science:

  • Surface science
  • Molecular machines
  • Nanotechnology

Background:

  • Single-molecule machines offer precise control at the nanoscale.
  • Adsorption conformation significantly influences molecular behavior on surfaces.

Purpose of the Study:

  • Investigate the dual functionality of a zwitterionic single-molecule machine.
  • Explore control over molecular motion (rotor vs. nanocar) via surface adsorption.
  • Analyze the mechanism of inelastic tunneling excitation for molecular movement.

Main Methods:

  • Utilizing Au(111) surfaces for molecular adsorption.
  • Applying bias voltage pulses to induce molecular motion.
  • Tuning surface coverage to control molecular conformation.
  • Investigating inelastic electron tunneling spectroscopy.

Main Results:

  • The molecule functions as a unidirectional rotor when anchored.
  • The molecule operates as a fast-drivable nanocar when physisorbed.
  • Surface coverage dictates the functional state (rotor or nanocar).
  • Inelastic tunneling excitation drives both unidirectional rotation and directed nanocar movement under identical conditions.

Conclusions:

  • Molecular conformation is a key determinant of single-molecule machine function.
  • Surface engineering allows for the selection of distinct nanoscale transport mechanisms.
  • Inelastic tunneling is a versatile excitation method for molecular devices.