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Antimony diiminopyridine complexes.

John R Tidwell1, Jason L Dutton, Caleb D Martin

  • 1Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA. caleb_d_martin@baylor.edu.

Dalton Transactions (Cambridge, England : 2003)
|October 6, 2021
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Summary
This summary is machine-generated.

Researchers synthesized novel antimony(III) chloride complexes using diiminopyridine ligands. Substituent variations on the ligands influenced the antimony center

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Main Group Chemistry

Background:

  • Antimony(III) chloride is a versatile precursor in coordination chemistry.
  • Diiminopyridine ligands offer tunable steric and electronic properties for metal complexation.
  • Understanding the influence of ligand substituents on antimony complex structures is crucial.

Purpose of the Study:

  • To synthesize and characterize novel N,N',N''-chelated antimony(III) chloride cationic complexes.
  • To investigate the impact of methyl, phenyl, and hydrogen substituents on diiminopyridine ligands on the resulting antimony complex structures.
  • To explore the solid-state behavior of these complexes, particularly in relation to Menshutkin complex formation.

Main Methods:

  • Stoichiometric reactions involving antimony trichloride, trimethylsilyl trifluoromethanesulfonate, and various diiminopyridine ligands.
  • Single-crystal X-ray diffraction for structural determination.
  • Solid-state characterization techniques to analyze complex formation.

Main Results:

  • Formation of N,N',N''-chelated SbCl2 cationic complexes.
  • Ligand substitution with methyl and phenyl groups resulted in antimony complexes with a lone pair.
  • The hydrogen-substituted ligand variant formed a unique Menshutkin complex with meta-xylene in the solid-state.

Conclusions:

  • Diiminopyridine ligands effectively chelate antimony(III) chloride.
  • Ligand substitution patterns dictate the presence of a lone pair on the antimony center.
  • The solid-state behavior of antimony complexes can be significantly influenced by ligand design, leading to unexpected adducts like Menshutkin complexes.