Complexes with cis-MoO₂ unit of new isothiosemicarbazone

Abstract

A new 5-bromo-2-hydroxobenzaldehyde S-ethylisothiosemicarbazone hydroiodide free Schiff base (H₂L) is synthesized and a series of molybdenum(VI) complexes, Mo^IVO₂LD, have prepared where D can be DMF, DMSO and pyridine. The compounds are characterized with molar conductance, FT-IR, ¹H NMR, elemental analyses, and UV-Vis techniques. Structures of complexes are determined with X-ray analysis. All experimental results confirmed that H₂L is a tridentate bi-deprotonated ligand (ONN), coordinating through phenolic oxygen, azomethine nitrogen, and isothioamide nitrogen. The neutral complexes are distorted octahedral.

Keywords:

• Isothiosemicarbazone
• Molybdenum(VI) complex
• cis-MoO₂
• Spectral study
• Crystal structure

Acknowledgments

Financial assistance received by R.T. from the Ferdowsi University of Mashhad. We thank the Università di Messina (Italy) for the provision of a diffractometer.