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Related Concept Videos

Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

11.3K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
11.3K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

10.8K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
10.8K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.4K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.4K
NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

10.3K
Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
10.3K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.6K
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...
1.6K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

8.0K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
8.0K

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Second-order nonlinear optical materials with a benzene-like conjugated π system.

Hongkun Liu1, Bingbing Zhang, Ying Wang

  • 1College of Chemistry and Environmental Science, Hebei University, Baoding 071002, P. R. China.

Chemical Communications (Cambridge, England)
|October 21, 2020
PubMed
Summary
This summary is machine-generated.

Benzene-like rings in nonlinear optical (NLO) materials offer excellent optoelectronic applications. Optimizing their conjugated π system enhances NLO properties by tuning band gaps.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Second-order nonlinear optical (NLO) materials are crucial for laser wavelength manipulation and optoelectronic devices.
  • Benzene-like structural units, including [B3O6] and [C3N3O3] rings, show promise for developing novel NLO materials.

Purpose of the Study:

  • To review recent advancements in benzene-like ring-based NLO materials.
  • To highlight strategies for optimizing the conjugated π system to enhance NLO properties.
  • To demonstrate tuning of band gap and NLO characteristics through structural modifications.

Main Methods:

  • Investigating various arrangement modes of benzene-like units.
  • Exploring the impact of different linker groups on material properties.
  • Utilizing isoelectronic species to fine-tune electronic structures.
  • Correlating structural modifications with NLO performance and band gap energies.

Main Results:

  • Demonstrated that specific arrangement modes and linker choices significantly influence NLO responses.
  • Showcased the effectiveness of isoelectronic substitutions in modulating electronic properties.
  • Established a clear relationship between conjugated π system optimization and enhanced NLO effects.
  • Identified key structural features that lead to superior optical properties.

Conclusions:

  • Benzene-like ring units are highly effective building blocks for advanced NLO materials.
  • Systematic optimization of the conjugated π system is critical for achieving desired NLO properties.
  • This approach provides a pathway for designing next-generation optoelectronic materials with tailored functionalities.