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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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,...
47.9K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.1K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.1K

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Combining Intra- and Intermolecular Charge Transfer with Polycationic Cyclophanes To Design 2D Tessellations.

M Mustafa Cetin, Yassine Beldjoudi, Indranil Roy

  • 1Joint Center of Excellence in Integrated Nanosystems , King Abdulaziz City for Science and Technology , Riyadh 11442 , Kingdom of Saudi Arabia.

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|October 4, 2019
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Summary
This summary is machine-generated.

Novel donor-acceptor cyclophanes exhibit photoinduced charge transfer and self-assemble into diverse 2D and tubular superstructures. These materials show potential for electron transport and multi-responsive applications.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Donor-acceptor (D-A) cyclophanes are crucial for developing advanced functional materials.
  • Controlling self-assembly and charge transfer properties is key for material design.
  • Naphthalene and viologen units offer tunable electronic and structural characteristics.

Purpose of the Study:

  • To synthesize and characterize novel D-A naphthalene-viologen-based cyclophanes.
  • To investigate their photoinduced charge transfer (CT) properties and conformational changes.
  • To explore their self-assembly into 2D and tubular superstructures and potential applications.

Main Methods:

  • Synthesis and characterization of various D-A cyclophane shapes and symmetries.
  • Solution optical studies to analyze photoinduced intramolecular CT and emission.
  • Co-crystallization with tetrathiafulvalene (TTF) to form complex superstructures.

Main Results:

  • Photoinduced intramolecular CT observed at 465 nm, leading to emission at 540 nm.
  • Box-like and hexagon-like cyclophanes self-assemble into 2D square, honeycomb, and hexagonal tiling patterns.
  • Co-crystallization with TTF yields tubular superstructures with dual intra- and intermolecular CT behavior.

Conclusions:

  • D-A cyclophanes offer precise control over superstructure formation and electronic properties.
  • The synthesized materials exhibit promising paramagnetic and multi-responsive characteristics.
  • These findings pave the way for developing novel materials for electron transport applications.