Spectroscopic, geometrical structures, DNA and biological activity studies of azo rhodanine complexes

Copper (II), cobalt (II) and nickel (II) complexes have been synthesized by the 
reaction of metal acetate/chloride with 5-(2, 3-dimethyl-1-phenylpyrazol-5-one azo)-2-thioxo-
4-thiazolidinone (HL). The IR spectra showed that the HL ligand takes its usual anionic (L) to 
chelate acetate-M (II) through nitrogen atom of hydrazone group and oxygen atom of 
carbonyl group (rhodanine) forming a six-membered structures, while with copper chloride 
act as monobasic tridentate through the (–N= N–), enolic (C–O) and oxygen keto moiety