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A new series of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), Cd(II), Hg(II) ,  VO(II), UO2(II) , Fe(III) and Ru(III) complexes of N'-(2-hydroxy-5-  phenyldiazenyl)benzylideneisonicotinohydrazide(H2L) have been synthesized  and characterized by elemental,1H-NMR, IR, UV-Vis., ESR, magnetic,  thermogravimetric analyses(TG) and conductivity measurements. The spectral  data show that, the ligand behaves as a neutral bidentate, (2), (4), (5),  (6) and (14), monobasic bidentate, (3), (7), (8), (9) and (10), monobasic  tridentate (11) and (16) or dibasic tridentate (12), (13) and (15) bonded to  metal ions via the carbonyl oxygen atom in ketonic or enolic form,  azomethine nitrogen atom and/or deprotonated phenolic hydroxyl oxygen. The  ESR spectrum of solid vanadyl(II), complex (2) shows axially anisotropic  spectrum with eight lines in the low field region and g?>g||,  A||>>A?relationship, which is characteristics of distorted octahedral  structure with dxy ground state. However, copper(II) complexes (4), (5) and  (6) and manganese(II) complex (10) show an isotropic type while the  copper(II) complexes (3) and (7)show an axial symmetry type with g||>g?>ge  indicating a covalent bond character. The antibacterial and antifungal  activities of the ligand and its metal complexes show mild activity compared  with standard drugs (Tetracycline for bacteria and amphotricene B for  fungi)

journal of the serbian chemical society

Metal complexes of N'-(2-hydroxy-5-phenyldiazenyl) benzylideneisonicotinohydrazide: Synthesis, spectroscopic characterization and antimicrobial activity