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Related Concept Videos

Valence Bond Theory02:42

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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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.
Removing one hydrogen from the intervening CH2 group...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.0K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
45.0K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

10.3K
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).
10.3K
Structural Isomerism02:34

Structural Isomerism

19.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Related Experiment Video

Updated: Sep 28, 2025

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Structurally Nontraditional Benzo[c]cinnoline-Based Electron-Transporting Materials with 3D Molecular Interaction

Yang Shi1, Zhengyang Bin1, Jiahui Liu1

  • 1Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China.

Angewandte Chemie (International Ed. in English)
|March 29, 2022
PubMed
Summary

We developed a novel "3D molecular interaction architecture" strategy to create high-performance electron-transporting materials (ETMs). Our new benzo[c]cinnoline (BZC) based ETM, DPBZC, shows enhanced stability and efficiency for organic light-emitting diodes.

Keywords:
Benzo[c]CinnolineElectron-Transporting MaterialGlass Transition TemperatureOrganic Light-Emitting DiodesOxidative C−H/C−H Coupling Reaction

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Chemical Synthesis

Background:

  • Electron-transporting materials (ETMs) are crucial for organic electronics but often have low glass transition temperatures (Tg), limiting device stability.
  • Developing ETMs with high Tg and excellent electron mobility is essential for practical applications.

Purpose of the Study:

  • To introduce a "3D molecular interaction architecture" strategy for designing high-performance ETMs.
  • To synthesize and characterize novel ETMs based on the benzo[c]cinnoline (BZC) skeleton.
  • To evaluate the performance of these new ETMs in fluorescent organic light-emitting diodes (OLEDs).

Main Methods:

  • A "3D molecular interaction architecture" strategy was employed.
  • Novel ETMs with a BZC skeleton were synthesized via C-H/C-H homo-coupling of N-acylaniline.
  • 2,9-diphenylbenzo[c]cinnoline (DPBZC) was synthesized and characterized.
  • DPBZC's thermal properties, electron mobility, and performance in OLEDs were evaluated.

Main Results:

  • DPBZC exhibits strong intermolecular interactions forming a 3D architecture, leading to a high Tg of 218°C.
  • DPBZC demonstrated fast electron mobility (μe) of 6.4×10-4 cm2V-1s-1.
  • DPBZC-based OLEDs achieved high external quantum efficiency (20.1%) and power efficiency (70.6 lmW-1), outperforming conventional ETMs.

Conclusions:

  • The "3D molecular interaction architecture" strategy is effective for designing high-performance ETMs.
  • DPBZC represents a promising new class of ETMs with enhanced thermal stability and electron transport properties.
  • DPBZC-based OLEDs show superior electroluminescent performance, indicating potential for advanced electronic devices.