Synthesis, characterization, thermal and antioxidant studies of potassium dihydrobisphenothiazinyl borate and its transition metal complexes

The bidentate borate anion H2B(ptz)2− and its transition metal complexes have been synthesized and characterized by elemental analyses, magnetic susceptibility, electronic, IR, 1H and 13C NMR data. The molar conductance of 10−3 M solution for all the complexes supports their non-ionic nature. The TGA profile of borate anion shows a single stage unlike that of two stage decomposition plot of the metal complexes.On the basis of spectroscopic studies the geometry of all the complexes have been proposed to be distorted-tetrahedral. The in vitro antioxidant and lipid oxidation inhibition of the ligand and its complexes have also been studied. The Cu[B(ptz)2]2 complex was found to be most effective in all the studies.

Graphical abstractTransition metal borate complexes were synthesized, characterized and have been studied for their antioxidant and lipid oxidation inhibition activity.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis, characterization of uninegative bidentate borate ligand, H2B(ptz)2−. ► Synthesis and characterization of transition metal complexes M[H2B(ptz)2]2. ► Thermogravimetric studies of borate anion and its complexes. ► Antioxidant activity of ligand and its complexes. ► Evaluation of lipid oxidation inhibition of ligand and its complexes.