10.22376/ijpbs.2019.10.1.p1-12 Volume 5 Issue 3 2014 (July- September) We reported here some new biological important metal- dizole complexes of the type ML lessThan sub greaterThan 2 lessThan /sub greaterThan X lessThan sub greaterThan 2 lessThan /sub greaterThan Where M = Ni (II ) and Co (II) , L = 2-( Pyrazol- 1-yl) pyridine (I) , 2- (3,5 – Dimethyl pyrazole -1-yl) 5 methyl pyridine (II) , 2- (3,5- Diphenyl pyrazole-1- yl) pyridine (III) , 2-(3,5- diphenyl pyrazol-1-yl ) 5- methyl pyridine (IV ) and X = Cl. These complexes have been tested against various bacteria such as Staphylococcus aureus, Escheria coli and Pseudomonas aeruginosa. The complexes show significant antimicrobial activity compared to that of parent compound. MANIKA BARAR Metal-dizole complexes , various bacteria, and spectral studies. 307-312