Zn(II) and Hg(II) complexes of naphthalene based thiosemicarbazone: Structure and spectroscopic studies

Synthesis, structure and spectroscopic characterization of 2-thiophenealdehyde-N(4)-napthylthiosemicarbazone and its complexes with biologically important Zn(II) and toxic Hg(II) metal ions have been reported. The crystal structure of the complexes reveals that both are distorted tetrahedral. In the Hg(II) complex the ligand is neutral and mondented where as in Zn(II) complex the ligand is bidented and anionic. Whereas conductivity measurement study shows both the complexes are molecular species. The beautiful changes in absorption spectra along with isosbestic points upon addition of respective metal salts to the ligand solution convincingly support the formation of metal complexes in solution phase. The other spectroscopic studies also show good correlation with their solid state structures.

Synthesis, structure and spectroscopic characterization of 2-thiophenealdehyde-N(4)-napthylthiosemicarbazone and its mononuclear neutral complexes with Zn(II) and Hg(II) metal ions has been reported.Figure optionsDownload as PowerPoint slideResearch highlights
► Synthesis of 2-thiophenealdehyde-N(4)-napthylthiosemicarbazone ligand.
► Neutral mono-nuclear complex with Hg(II) with neutral ligand
► Neutral mono-nuclear complex with Zn(II) with anionic ligand.
► Significant 1H NMR shifts observed for both the complexes compared to free ligand.
► Changes in absorption spectra upon addition of Zn(II) and Hg(II) to ligand.