The reaction of Fe(II) and Ni (II) metal ions with L1 : 3 (2’- chlorophenyl) - 4- benzoyl - 5 (2-hydroxy phenyl) pyrazole, L2: 3 (2’-chlorophenyl) - 4- pyridoyl -5 (2-hydroxy phenyl) pyrazole , L3: 3 (2’-aminophenyl)- 4-pyridoyl - 5 (2- hydroxyl phenyl) pyrazole and L4: 3 (4’-chlorophenyl) -4-Benzoyl -5(2-hydroxy-phyenyl) pyrazole, at 0.1M ionic strength at 28 ± 0.10C in 70% ethanol -water mixture and 70% dioxane-water mixture have been studied pH-metrically. The data obtained were used to estimate the values of proton-ligand (pK) and metal-ligand (logK) stability constants in different solvents. It is observed that the pK and logK values in 70% dioxane-water mixture are greater than in 70% ethanol -water mixture. Fe(II) and Ni(II) metal ions formed 1:1 and 1:2 complexes with all the ligands in both solvent medium.

The present work represents the synthesis, characterization, and antimicrobial studies of novel series of 2,4,6-Trihydrazino-6- substituted-1,3,5-triazine Schiff Base Metal Complexes. The characterization techniques included are thermal and antimicrobial characterization methods used to characterize newly synthesized 1,3,5 trizine derivatives and its complexes. The structural characterizations include X-ray diffraction (XRD), Fourier Transform IR Spectroscopy (FTIR), UV-visible spectroscopy, and some important properties like Thermal Properties. Scanning electron Microscopy (SEM) has been also done to study the compounds and characterization in more detail. The antibacterial activity of the ligands and their metal complexes against different bacterial pathogens were analyzed. Muller Hinton Agar was used as medium for bacterial sensitivity and testing the activity of microorganisms. For this study different organisms like Staphalococcus aureus, Bacillus subtilis, Escherichia coli and Pseudomonas fluorescens were used.

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The reaction of Pr (III) and Nd (III) metal ions with some substituted pyrazoles, at 0.1M ionic strength and at 30 ± 0.10C in 70% acetone-water mixture and 70% propanol-water mixture have been studied pH-metrically. The data obtained were used to estimate the values of proton-ligand (pK) and metal-ligand (logK) stability constants in different solvents. It is observed that the pK and logK values in 70% propanol-water mixture are grater than in 70% acetone -water mixture. Pr (III) and Nd (III) metal ions formed 1:1 and 1:2 complexes with all the ligands in both solvent medium.

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