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A square-planar hydrated cationic tetrakis(methimazole)gold(III) complex.

Will E Lynch1, Clifford W Padgett1, Brandon Quillian1

  • 1Department of Chemistry and Physics, Armstrong State University, Savannah, GA 31419, USA.

Acta Crystallographica. Section C, Structural Chemistry
|April 4, 2015
PubMed
Summary

A new gold(III) complex with methimazole ligands was synthesized and characterized. This cationic complex features a pseudo-square-planar geometry around the gold(III) center.

Keywords:
S-donor ligandscrystal structuregold(III) complexmetal–organic compoundmethimazole

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Area of Science:

  • Inorganic Chemistry
  • Coordination Chemistry
  • Crystallography

Background:

  • Gold(III) complexes are of interest for their diverse applications.
  • Methimazole is a sulfur-containing heterocyclic compound with known coordinating abilities.
  • Understanding the coordination chemistry of gold is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize a novel cationic gold(III) complex.
  • To investigate the coordination behavior of methimazole with gold(III).
  • To determine the crystal structure and geometry of the resulting complex.

Main Methods:

  • Reaction of chloroauric acid trihydrate with methimazole in methanol.
  • Isolation and crystallization of the gold(III) complex.
  • Single-crystal X-ray diffraction analysis to determine the structure.

Main Results:

  • Successfully synthesized the cationic complex tetrakis(1-methyl-2,3-dihydro-1H-imidazole-2-thione-κS)gold(III) trichloride sesquihydrate, [Au(C4H6N2S)4]Cl3·1.5H2O.
  • The complex crystallizes as dark-red crystals.
  • X-ray diffraction revealed a pseudo-square-planar geometry around the Au(III) center, with gold atoms located at inversion centers on the unit cell corners.

Conclusions:

  • The synthesis yielded a novel gold(III) complex with methimazole ligands.
  • The complex exhibits a unique pseudo-square-planar coordination geometry.
  • The crystal structure provides insights into the coordination preferences of gold(III) with sulfur-donor ligands.