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Antimony centre in three different roles: does donor strength or acceptor ability determine the bonding pattern?

Richard Chlebík1, Csilla Fekete2, Roman Jambor1

  • 1Department of General and Inorganic Chemistry, University of Pardubice, Studentská 573, CZ 532 10 Pardubice, Czech Republic. libor.dostal@upce.cz.

Dalton Transactions (Cambridge, England : 2003)
|October 18, 2024
PubMed
Summary

New antimony(III) compounds with guanidine ligands were synthesized and studied. These compounds display diverse coordination behaviors with palladium and platinum, revealing unique bonding modes for antimony in novel complexes.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Chemistry

Background:

  • Guanidine ligands offer unique coordination properties.
  • Antimony(III) compounds are versatile in coordination chemistry.
  • Understanding ligand behavior in metal complexes is crucial.

Purpose of the Study:

  • Synthesize and characterize novel antimony(III) compounds with guanidine ligands.
  • Investigate the coordination behavior of these antimony compounds with palladium and platinum.
  • Determine the structural and bonding characteristics of the resulting metal complexes.

Main Methods:

  • Synthesis of triorgano-Ar3Sb, diorgano-Ar2SbCl, and monoorgano-ArSbCl2 compounds.
  • Characterization using 1H and 13C NMR spectroscopy and single-crystal X-ray diffraction (sc-XRD).
  • Coordination studies with cis-[PdCl2(CH3CN)2] and PtCl2, followed by sc-XRD analysis of complexes.

Main Results:

  • Successful synthesis and characterization of antimony(III) compounds with a pendant guanidine ligand (Ar).
  • Isolation and structural determination of novel palladium and platinum complexes (1-4) featuring the antimony ligands.
  • Observation of distinct bidentate and tridentate coordination modes for Ar3Sb and Ar2SbCl ligands, respectively.
  • Identification of three unique bonding modes for antimony within the synthesized complexes.

Conclusions:

  • The guanidine-functionalized antimony(III) ligands exhibit versatile coordination chemistry.
  • Antimony(III) compounds can adopt diverse bonding modes when coordinated to transition metals like palladium and platinum.
  • The structural and theoretical studies provide insights into the coordination capabilities of these novel organoantimony compounds.