Synthesis and Characterization of Some New Premetalated Dyes Based on Cu(II)

The new complex combinations on Cu(II) were synthesized, using sodium salts of disulphonic acids as ligands: sodium(E)-2-(1-hydroxy-4-sulfonatonaphtalen-2-yl)diazenyl-6-methoxybenzo[d]thiazole and sodium(E)-2-((2-hydroxy-6-sulfonatonaphtalen-1-yl)diazenyl)-6-methaxybenzoicfithiazole, both having the group -6-methoxibenzo[d]tiazol sulphonated in 5 and 7 positions, mixed in both isomeric forms, denominated in this work as HL(1) and respectively HL(2) ligand. The aqueous insoluble complexes, obtained by precipitation from the interaction of the two ligands with Cu(2+) ion, were previously dried till constant mass at 105 degrees C and then characterized by: chemical elemental analysis (Cu, C, H, N, S si Na), FTIR, SEM-EDX, XRD and thermal analysis in dynamic system. Their crystalline structure was investigated by electronic microscopy and X-ray difraction and the thermal derivatogrames revealed their stability till 150 degrees C. The studies show that Cu(II) central atoms are tetracoordinated with square plan (dsp(2) hybridization) and respectively tetrahedral structures (hybridization sp(3)), corresponding to the two types of ligands, HL(1) for T(d) geometry and HL(2) for the D(4h) and corespond to the following molecular formulae: [Cu(C(18)H(10)N(3)S(3)O(8)Na(2))(H(2)O)Cl]center dot 2HCl and [Cu(C(18)H(10)N(3)S(3)O(8)Na(2))(2)]center dot 4HCl. These complexes were synthesized for applications in wool fibers dyeing processes, having the advantage of reduced toxicity compared with other commonly used complexes.