Platinum(II), palladium(II), and gold(III) complexes of dianionic, secondary dithiooxamide ligands

Abstract

Reactions of the complexes cis-[PtCl₂(PPh₃)₂], [PdCl₂(dppe)] (dppe = Ph₂PCH₂CH₂PPh₂) and the N,C-cycloaurated gold(III) complexes [AuCl₂(2-benzylpyridyl)] and [AuCl₂(C₆H₄CH₂NMe₂)] with the secondary dithiooxamide EtNHC(S)C(S)NHEt in refluxing methanol with Et₃N base gave good yields of the respective neutral dithiooxamide complexes containing a doubly deprotonated dithiooxamide ligand. The Pt and Pd complexes, as well as [Au{SC(NEt)C(NEt)S}(C₆H₄CH₂NMe₂)], were characterized by single-crystal X-ray diffraction. In all complexes the ligand is S,S-bonded to the metal center. The complexes were also characterized by NMR spectroscopy and ESI mass spectrometry.

Keywords:

• Dithiooxamide
• sulfur donor ligands
• X-ray structures
• platinum
• palladium
• gold

Acknowledgements

We thank the University of Waikato for financial support of this work, and Pat Gread, Wendy Jackson, and Dr. Judith Burrows for technical assistance.

Disclosure statement

No potential conflict of interest.