Thermal properties, antimicrobial activity and DNA binding of Ni (II) complexes of azo dye compounds

A novel series of nickel (II) azo dye complexes of 5-(4-methoxyphenylazo)-2-thioxo-
4-thiazolidinone (HL 1), 5-(4-methylphenylazo)-2-thioxo-4-thiazolidinone (HL 2), 5-
(phenylazo)-2-thioxo-4-thiazolidinone (HL 3) and 5-(4-nitrophenylazo)-2-thioxo-4-
thiazolidinone (HL 4) were prepared and characterized elemental analyses, IR, UV–Visible 
spectra, X-ray diffraction analysis and mass spectrum as well as thermogravimetric analysis 
(TGA). The magnetic measurements of Ni (II) complexes (1–4) lie in 3.05–3.20 BM., as 
anticipated for octahedral geometry. Quantum chemical parameters and molecular 
structures of the complexes were theoretically computed and the results were studied. IR 
spectra show that HL n ligands (n= 1–4) act a monobasic bidentate ligands by coordinating 
via the oxygen atom of the deprotonated OH group moiety and nitrogen atom of azo