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Related Concept Videos

Structure of Benzene: Kekulé Model01:07

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Structure of Benzene: Molecular Orbital Model01:18

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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).
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Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Location and Orientation of the Heart01:13

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The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
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Atomic Radii and Effective Nuclear Charge03:08

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Benzene to Phenol via Cumene: Hock Process01:27

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The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...
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Fabrication of Spatially Confined Complex Oxides
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Confinement Effects on the Benzene Orientational Structure.

Marta Falkowska1, Daniel T Bowron2, Haresh Manyar3

  • 1School of Chemical Engineering and Analytical Science, The University of Manchester, UK.

Angewandte Chemie (International Ed. in English)
|February 16, 2018
PubMed
Summary
This summary is machine-generated.

Researchers experimentally determined the structure of benzene confined in MCM-41. Nanoscale confinement significantly alters molecular structure and correlations compared to bulk liquid benzene.

Keywords:
arenesheterogeneous catalysisliquidsmesoporous materialsneutron diffraction

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Confinement influences liquid properties like miscibility and phase transitions.
  • Molecular ordering under confinement is typically studied via simulations.
  • Understanding confined liquids is crucial for various chemical and physical processes.

Purpose of the Study:

  • To experimentally determine the structure of benzene confined within MCM-41.
  • To investigate the effects of nanoscale confinement on molecular ordering and correlations.
  • To compare the structure of confined benzene with its bulk phase.

Main Methods:

  • Total neutron scattering measurements were employed.
  • Benzene was confined within mesoporous silica (MCM-41).
  • Structural analysis focused on molecular layering and spatial correlations.

Main Results:

  • Benzene molecules exhibit distinct layering within the MCM-41 pores.
  • Four concentric cylindrical shells of benzene were identified in an 18 Å pore.
  • Nanoscale confinement significantly altered spatial and orientational molecular correlations compared to bulk benzene.

Conclusions:

  • Experimental data reveals the detailed structure of confined benzene.
  • Confinement induces significant changes in molecular organization and interactions.
  • Observed structural differences suggest potential alterations in chemical reactivity for confined benzene.