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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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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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Color in Coordination Complexes
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Stable Antiaromatic [24]Hexaphyrin(1.1.0.0.1.0) and Its Metal Complexes.

Yang Liu1, Ling Xu1, Yutao Rao1

  • 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine (Ministry of Educational of China), Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, Hunan Normal University, Changsha 410081, China.

Organic Letters
|November 6, 2023
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a stable antiaromatic [24]hexaphyrin molecule, which forms unique bis-palladium(II) and tris-rhodium(I) complexes. The aromatic [26]hexaphyrin is unstable, readily oxidizing back to the [24] form.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Hexaphyrins are macrocyclic compounds with unique electronic and structural properties.
  • Controlling the aromaticity and stability of hexaphyrin systems is crucial for their application.
  • Substituted hexaphyrins offer tunable characteristics for complexation and material science.

Purpose of the Study:

  • To synthesize a stable, substituted [24]hexaphyrin with antiaromatic character.
  • To investigate the reduction of the [24]hexaphyrin to its aromatic [26] counterpart.
  • To explore the coordination chemistry of the synthesized [24]hexaphyrin with metal ions, specifically palladium and rhodium.

Main Methods:

  • Base-catalyzed twofold SNAr reaction for the synthesis of the [24]hexaphyrin.
  • Chemical reduction to obtain the [26]hexaphyrin.
  • Complexation reactions with palladium(II) and rhodium(I) salts.

Main Results:

  • A stable 5,10,23-trimesityl-substituted [24]hexaphyrin was successfully synthesized.
  • The [24]hexaphyrin was reduced to an unstable aromatic [26]hexaphyrin, which readily oxidized back.
  • The [24]hexaphyrin formed unique bis-PdII and tris-RhI complexes.
  • The bis-PdII complex exhibited a strong paratropic ring current.
  • The tris-RhI complex displayed unusual coordination involving a shared carbonyl group.

Conclusions:

  • Stable antiaromatic hexaphyrins can be synthesized and serve as versatile ligands.
  • The interconversion between antiaromatic and aromatic hexaphyrins highlights their dynamic electronic nature.
  • The unique coordination geometries in the metal complexes offer insights into novel supramolecular architectures.