Comparative studies, synthesis, spectroscopic and characterization of N-methylisatin-3-Girard’s T and P hydrazone complexes

•Methylisatin Girard’s T and P hydrazones.•Biological activity of the ligands and complexes.•Fe3+, Al3+, Sb3+ and Sn2+ complexes.•DFT calculations.

Different types of complexes derived from the reactions of N-methylisatin Girard’s T hydrazone, N,N,N-trimethyl-2-[(2z)-2-(1-methyl-2-oxo-1,2-dihydro-3H-indole-3-ylidene) hydrazino]-2-oxo-ethan ammonium chloride (MIGT) and N-methylisatin Girard’s P hydrazone, 1-{2-(2z)-2-[(1-methyl-2-oxo-1,2-dihydro-3H-indole-3-ylidene) hydrazino]-2-oxoethyl}pyridinium chloride (MIGP) with Fe3+, Al3+, Sb3+ and Sn2+ salts were synthesized. The isolated complexes were characterized by elemental analyses, molar conductivities, spectral (IR, UV–Vis., 1H NMR, mass), magnetic moments and thermal measurements. The values of conductance suggest that the complexes are conducting in polar solvents (EtOH, H2O and DMF). The IR spectra suggest that the ligands coordinate in a bidentate and/or tridentate manner via the carbonyl groups of both N-methylisatin and Girard’s T and/or P and the (CN) group. The solvents inside and outside the coordination sphere were determined by weight loss and TGA methods. The octahedral geometry of the complexes is confirmed using spectral, magnetic and DFT method from DMOL3 calculations. The ligands and their metal complexes were tested against different strains of bacteria and fungi.

Graphical abstractMolecular structures of L2.Figure optionsDownload full-size imageDownload as PowerPoint slide