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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Tetrahedral Complexes
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The first scorpionate ligand based on diazaphosphole.

Martin Mlateček1, Libor Dostál1, Zdeňka Růžičková1

  • 1Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic.

Dalton Transactions (Cambridge, England : 2003)
|November 6, 2015
PubMed
Summary

A new scorpionate ligand, phenyl-tris(1,2,4-diazaphospholyl)borate (PhTdap), was synthesized and its coordination chemistry with various metals explored. This ligand exhibits diverse coordination modes and influences electronic properties, establishing a new ligand-field strength order.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • Scorpionate ligands are versatile tools in coordination chemistry, offering tunable electronic and steric properties.
  • The development of novel scorpionate ligands with unique donor atoms, such as phosphorus, expands their application scope.
  • Understanding ligand-metal interactions is crucial for designing catalysts and functional materials.

Purpose of the Study:

  • To synthesize and characterize a novel phenyl-tris(1,2,4-diazaphospholyl)borate (PhTdap) scorpionate ligand.
  • To investigate the coordination behavior of PhTdap with a range of transition and non-transition metals.
  • To elucidate the electronic properties and ligand-field strength of PhTdap in comparison to related ligands.

Main Methods:

  • Synthesis of PhTdap via reaction of PhBCl2 with 1H-1,2,4-λ(3)-diazaphosphole and NEt3.
  • Preparation and characterization of ten metal complexes with PhTdap.
  • X-ray crystallography for structural determination of metal complexes.
  • UV-Vis spectroscopy to study electronic properties and ligand-field strength.

Main Results:

  • PhTdap was successfully synthesized and forms complexes with diverse metals including Tl(I), Pd(II), Ti(IV), Mo(II), Mn(I), Fe(II), Ru(II), Co(II), Co(III), Ni(II), and Cd(II).
  • Observed coordination modes include κ(2)-N,N with intramolecular η(3)-phenyl coordination in Tl(PhTdap), and κ(3)-N,N,N for most other metal ions.
  • Unusual intermolecular π-interactions and infinite molecular chains were noted in the Tl(PhTdap) crystal structure.
  • The ligand-field strength order was established: HB(3,5-Me2pz)3 < PhB(pz)3 < HB(1,2,4-triazolyl) < HB(pz)3 < PhB(1,2,4-triazolyl) < PhTdap.
  • CH/P replacement in PhTdap leads to increased electron density at the metal center compared to tris(pyrazolyl)borate ligands.

Conclusions:

  • PhTdap is a novel, versatile scorpionate ligand capable of diverse coordination modes.
  • The electronic properties of PhTdap contribute to its significant ligand-field strength.
  • The study provides valuable insights into the coordination chemistry and electronic effects of phosphorus-containing scorpionate ligands.