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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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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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Dipyrrin based metal complexes: reactivity and catalysis.

Stéphane A Baudron1

  • 1Université de Strasbourg, CNRS, CMC UMR 7140, 4 rue Blaise Pascal, F-67000, Strasbourg, France. sbaudron@unistra.fr.

Dalton Transactions (Cambridge, England : 2003)
|April 21, 2020
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Summary

Dipyrrin ligands and their metal complexes offer versatile platforms for creating novel organic compounds and metallo-organic architectures. Their unique properties enable diverse chemical transformations and catalytic applications.

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Area of Science:

  • Coordination Chemistry
  • Organic Synthesis
  • Catalysis

Background:

  • Dipyrrin ligands, also known as half-porphyrins, possess unique properties due to their bis-pyrrolic structure.
  • These ligands can be functionalized at the heterocyclic backbone or meso position, influencing their metal complexes' characteristics.

Purpose of the Study:

  • To review strategies for derivatizing dipyrrin ligands and their metal complexes.
  • To highlight the catalytic potential of dipyrrin metal complexes in various organic transformations.
  • To showcase the application of these complexes in synthesizing diverse polypyrrolic compounds and metallo-organic architectures.

Main Methods:

  • Elaboration of derivatization strategies for dipyrrin ligands and their meso positions.
  • Synthesis and characterization of various dipyrrin metal complexes.
  • Investigation of catalytic activities in reactions like C-H activation, amination, polymerization, and oxidation.

Main Results:

  • Successful development of methods for functionalizing dipyrrin ligands and their metal complexes.
  • Demonstration of dipyrrin metal complexes catalyzing a range of chemical reactions, including C-H activation/amination and polymerization.
  • Revisitation of classical catalytic systems (e.g., Grignard, Rh-based, Suzuki-Miyaura) through dipyrrin incorporation.
  • Formation of diverse polypyrrolic derivatives, including 2,2'-bis-dipyrrins, nor-/hetero-corroles, and porphynoids.

Conclusions:

  • Dipyrrin metal complexes are valuable tools for synthesizing complex organic molecules and metallo-organic frameworks.
  • The tunable steric and electronic properties of dipyrrins allow for the design of tailored catalysts.
  • These complexes hold significant potential for advancing synthetic organic chemistry and materials science.