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Related Concept Videos

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.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Cyclic Carbaporphyrin Arrays.

Haodan He1, Seokwon Lee2, Ningchao Liu1

  • 1College of Chemistry, Beijing Normal University, Beijing 100875, China.

Journal of the American Chemical Society
|January 24, 2023
PubMed
Summary
This summary is machine-generated.

Synthesized cyclic carbaporphyrin arrays (trimer 6 and tetramer 7) exhibit efficient excitation energy transfer (EET). Differences in molecular conformation and transition dipole orientation influence energy hopping times, impacting Förster resonance energy transfer efficiency.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Carbaporphyrins are macrocyclic compounds with unique electronic and photophysical properties.
  • Cyclic arrays of carbaporphyrins offer potential for advanced materials due to their defined structures and energy transfer capabilities.

Purpose of the Study:

  • To synthesize novel cyclic carbaporphyrin trimers and tetramers.
  • To investigate the excitation energy transfer (EET) dynamics within these cyclic arrays.
  • To correlate structural differences with EET efficiency and exciton energy hopping (EEH) times.

Main Methods:

  • One-pot Yamamoto-type coupling for synthesis of trimer 6 and tetramer 7.
  • Single-crystal X-ray diffraction for structural elucidation.
  • Transient absorption (TA) anisotropy and pump-power-dependent studies for EET and EEH analysis.

Main Results:

  • Successfully synthesized cyclic carbaporphyrin trimer 6 (planar, [6]cyclo-meta-phenylene core) and tetramer 7 (zig-zag, [8]cyclo-meta-phenylene core).
  • Confirmed efficient excitation energy transfer (EET) in both arrays.
  • Determined exciton energy hopping (EEH) times of 18 ps for trimer 6 and 35 ps for tetramer 7.
  • Calculated orientation factors (κ2) of 2.15 for 6 and 1.03 for 7, correlating with observed EEH times.

Conclusions:

  • First synthesis of covalently linked cyclic carbaporphyrin arrays from a single carbaporphyrin precursor.
  • Structural conformation and transition dipole orientation significantly influence EET dynamics in these polycyclic systems.
  • Findings provide insights into controlling energy transfer in molecular architectures for potential optoelectronic applications.