Synthesis and Preliminary Characterization of Metal Complexes of 1, 2-Dihydroxyanthraquinone-Based Azo Compound.
Resumen
This paper reports the preliminary characterization of six transition metal complexes of an azo compound derived from the well-established coupling reaction between the diazonium salt of the substituted aromatic amine: 2aminobenzoic acid and the coupler, 1, 2-dihydroxyanthraquinone.The products yield was between 75% - 85%. The resultant metal complexes were preliminarily characterized using melting point, Solubility, Chromatography, Ultraviolet –Visible (UV-Vis) and Infrared (IR) spectroscopy. Well defined melting points for the azo metal complexes gave ranges between: 298oC-309oC. The retardation factor (R) values for these complexes ranged f between: 0.59-0.72. The bathochromic shifts for the various metal complexes in the visible region of the electromagnetic spectra ranged between 422 nm to 466 nm and 484 nm to 604 nm. The M-O and M-N vibrations in the infrared spectra at 410-495 cm-1 and 540-591 cm-1 respectively provide evidence of the formation of metal complexes. These new azo metal complexes with anthraquinone moiety has potential application as pigments in surface coatings and in textile printing due to their insolubility in water and most organic solvents in addition to their thermal stability.
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Referencias
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