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Related Concept Videos

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday...
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Aromatic molecules as spintronic devices.

J H Ojeda1, P A Orellana2, D Laroze1

  • 1Instituto de Alta investigación, Universidad de Tarapacá, Casilla 7D Arica, Chile.

The Journal of Chemical Physics
|March 18, 2014
PubMed
Summary
This summary is machine-generated.

This study explores spin-dependent electron transport in aromatic molecules. Applying magnetic fields reveals tunable magnetoresistance based on molecular length and contact interactions.

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Quantum transport

Background:

  • Understanding electron transport in molecular systems is crucial for developing advanced electronic devices.
  • Aromatic molecules offer unique electronic properties for potential applications in molecular electronics.
  • Spin-dependent transport is a key phenomenon for spintronic applications.

Purpose of the Study:

  • To investigate spin-dependent electron transport through aromatic molecular chains.
  • To model the system using various geometrical configurations and a tight-binding Hamiltonian.
  • To analyze the influence of external magnetic fields on transport properties and magnetoresistance.

Main Methods:

  • Utilized the Green's function approach combined with the Landauer formalism.
  • Modeled aromatic molecular chains connected to semi-infinite leads.
  • Investigated different geometrical configurations and their impact on electron transport.

Main Results:

  • Demonstrated spin-dependent transport in short aromatic molecules under applied magnetic fields.
  • Observed that magnetoresistance values are tunable.
  • Identified dependencies of magnetoresistance on magnetic field strength, molecule length, and contact interactions.

Conclusions:

  • Spin-dependent electron transport is feasible in aromatic molecular chains.
  • Magnetoresistance in these systems can be controlled by external stimuli and system parameters.
  • The findings provide insights for designing molecular-based spintronic devices.