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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.1K
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...
4.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
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.
3.1K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

16.7K
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...
16.7K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

13.3K
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).
13.3K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.7K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.7K

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Imaging the electronic structure of on-surface generated hexacene.

Justus Krüger1, Frank Eisenhut, José M Alonso

  • 1Institute for Materials Science, Max Bergmann Center of Biomaterials, and Center for Advancing Electronics Dresden, TU Dresden, 01069 Dresden, Germany. francesca.moresco@tu-dresden.de.

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Researchers studied single hexacene molecules on gold surfaces using advanced microscopy. This allowed detailed mapping of their electronic properties at the molecular level.

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Area of Science:

  • Molecular physics
  • Surface science
  • Organic electronics

Background:

  • Studying individual organic molecules is crucial for understanding their electronic properties.
  • Hexacenes are a class of organic molecules with potential applications in electronics.
  • Directly observing single molecules on surfaces presents significant experimental challenges.

Purpose of the Study:

  • To investigate the electronic structure of single hexacene molecules.
  • To develop a method for studying air-stable organic precursors on surfaces.
  • To achieve intramolecular resolution of electronic eigenstates.

Main Methods:

  • Utilizing scanning tunneling microscopy (STM) for high-resolution imaging.
  • Employing scanning tunneling spectroscopy (STS) to probe electronic states.
  • Employing surface-assisted reduction of air-stable hexacene precursors on a gold (Au(111)) surface.

Main Results:

  • Successfully imaged and characterized individual hexacene molecules on Au(111).
  • Mapped the extended electronic eigenstates of single hexacene molecules with intramolecular resolution.
  • Demonstrated a viable method for studying sensitive organic molecules on surfaces.

Conclusions:

  • Surface-assisted reduction is an effective strategy for studying single organic molecules.
  • Detailed electronic structure of hexacenes can be resolved at the single-molecule level.
  • This work provides fundamental insights for organic electronic device development.