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In this study, experimental techniques such as Raman and infrared vibrational analysis and X-ray crystal diffraction were used to characterize three new azo chelate dyes derived from 1-phenyl-azo-2-naphthol (Sudan I) and its analogue 1-(xylylphenylazo)-2-naphthol (Sudan II) with metal ions. The Raman and infrared spectroscopic analysis have also provided useful information concerning the coordination...
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