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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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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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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Double Porphyrin Cage Compounds.

Kathleen Stout1, Theo P J Peters1, Mathijs F J Mabesoone1

  • 1Institute for Molecules and Materials Radboud University Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands.

European Journal of Organic Chemistry
|December 31, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel double porphyrin cage compounds using click chemistry. These structures, featuring varying alkyl chain lengths, form unique sandwich complexes with zinc and dabco.

Keywords:
Axial ligandsHost–guest chemistryPorphyrin compounds

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Porphyrin-based macrocycles are crucial in supramolecular chemistry.
  • Developing complex, multi-component molecular architectures remains a key challenge.
  • Click chemistry offers efficient routes for constructing complex molecules.

Purpose of the Study:

  • To synthesize and characterize novel double porphyrin cage compounds.
  • To investigate the influence of linker length on cage structure and properties.
  • To explore the complexation behavior of zinc derivatives with dabco.

Main Methods:

  • Multistep organic synthesis involving diphenylglycoluril clip molecules and porphyrins.
  • "Click"-chemistry for linking porphyrin units via alkyl chains of varying lengths (3, 5, and 11 carbons).
  • Nuclear Magnetic Resonance (NMR) spectroscopy for structural characterization.
  • Complexation studies with zinc and 1,4-diazabicyclo[2,2,2]octane (dabco).

Main Results:

  • Successfully synthesized three double porphyrin cage compounds with different alkyl spacer lengths.
  • NMR characterization confirmed the formation of cage structures, revealing mixtures of two diastereoisomers.
  • Zinc derivatives of the cages demonstrated the ability to form sandwich-like complexes with dabco.

Conclusions:

  • The study presents a novel synthetic strategy for double porphyrin cages.
  • The synthesized cages exhibit defined structures and form interesting supramolecular complexes.
  • These findings open avenues for designing advanced porphyrin-based molecular architectures.