Synthesis, characterization and crystal structures of platinum II saccharinate complexes with 1,5-cyclooctadiene

Two new platinum II complexes, namely [PtCl sac COD ] 1 and [Pt sac $_{2}$ COD ] 2 sac $=$ saccharinate and COD $=$ 1,5-cyclooctadiene , were synthesized and characterized by elemental analysis, IR, NMR, ESI-MS spectroscopic and thermal analysis TG/DTA methods. The platinum II complexes were prepared from the reaction of [PtCl$_{2}$ COD ] with Na sac • 2H$_{2}$O. The addition of the sac ligand resulted in the replacement of 1 and 2 chlorido ligands in [PtCl$_{2}$ COD ] to yield 1 and 2, respectively. The structures of the complexes were determined by single crystal X-ray diffraction and showed a distorted square planar coordination geometry around platinum II . COD acted as a $\pi $-donor ligand, while sac was $N$-coordinated in both complexes. The TG/DTA data indicated that both complexes were thermally stable up to 220 $^{\circ}$C C in air and their thermal decompositions yielded Pt as a final product. Complexes 1 and 2 were also designed as possible precursors to synthesize new mixed-ligand platinum II sac complexes in a one-pot reaction.

Keywords:

Pt II complex, saccharinate, 1, 5-cyclooctadiene crystal structure,

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