Synthesis and Spectrophotometric Studies of Some Transition Metal Complexes with New Azo Dye 2-[2-(6-Methoxy benzothiazolyl)azo]-4-Nitro Phenol

Abstract

This paper reports the preparation and identification of Ni(II), Pd(II), Pt(IV), Cu(II), Ag(I) and Au(III) metal complexes with new aryl thiazolyl azo 2-[2-(6-methoxy benzothiazolyl)azo]-4-nitro phenol (6-MBTANP = HL). The structure of the isolated chelat complexes characterized by elemental analysis, IR, electronic spectral, magnetic moment and molar conductivity. The obtained results indicated that the ligand (6-MBTANP) behaves as a tridentate chelating agent with 1:1 and 1:2 (metal:ligand) complexes. Investigation of the stereochemistry of these chelat complexes showed that, Ni(II), Cu(II) and Pt(IV) complexes are octahedral while Pd(II) and Au(III) complexes are square planer and Ag(I) complex is tetrahedral geometry. Conductance measurements suggest the 1:2 electrolytic nature of the Pt(IV) and (1:1) electrolytic nature of the Au(III) complexes but non-electrolytic nature of remaining complexes. The analytical data show the existence of coordination water in Ni(II), Pt(IV), Cu(II), Ag(I) and Au(III) complexes. Stability constants of complexes were calculated by spectrophotometrically.