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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Unpredictable Dynamic Behaviour of Ruthenium Chelate Pyrrole Derivatives.

Giacomo Drius1, Riccardo Tarroni1, Matteo Birchmeier1

  • 1Department of Industrial Chemistry 'Toso Montanari', Alma Mater Studiorum, Università di Bologna, Via Piero Gobetti, 85, 40129 Bologna, Italy.

Molecules (Basel, Switzerland)
|July 13, 2024
PubMed
Summary

Ruthenium complexes with pyrrole derivatives undergo dynamic chelate conversion, forming stable species. These compounds exhibit aromatic features and potential antibacterial and antifungal properties.

Keywords:
DFTSCXRDantibacterialchelation changeisomerismruthenium

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Ruthenium complexes are versatile catalysts and materials.
  • Pyrrole derivatives offer unique coordination possibilities.
  • Understanding dynamic chelate conversions is crucial for designing new complexes.

Purpose of the Study:

  • To synthesize and characterize novel ruthenium complexes with pyrrole-based ligands.
  • To investigate the dynamic chelate conversion of ruthenium complexes.
  • To explore the structural, electronic, and biological properties of the synthesized compounds.

Main Methods:

  • Synthesis of ruthenium complexes using [Ru(H)2(CO)(PPh3)3].
  • Characterization using X-ray diffraction, ESI-MS, IR, and NMR spectroscopy.
  • Density Functional Theory (DFT) calculations for electronic structure analysis.
  • Antibacterial and antifungal activity screening.

Main Results:

  • Formation of homoleptic and dynamic chelate ruthenium complexes.
  • Isolation of functional isomers with distinct structural and electronic properties.
  • Evidence of aromaticity and stabilizing backbonding effects in the complexes.
  • Demonstration of antibacterial and antifungal activity against various pathogens.

Conclusions:

  • Ruthenium complexes with pyrrole ligands can undergo dynamic chelate conversions.
  • The synthesized complexes exhibit unique structural and electronic characteristics.
  • These compounds show promise as potential antimicrobial agents.