Abstract
Many colorimetric methods have been reported based on synthesis via redox reactions, rather than complex formation, of colored (soluble or insoluble) molecules. But the complicated forming methods continue to be at the forefront of chemical analyses. Complex building reactives are required for functional groups capable of metal complexes. OH, SH and –NO compounds have been proven to be good organic reactives. Some common compounds are mentioned such as 1-nitroso Nitrosophhenol, Thionalide, Thionalides, 4-hydroxybenzothiazole, Salicylaldoxime, Mercaptobenzothiazole., -2-naphthol, 3,6-disodium Sulfonate, o-nitrosophhenol; nitrosophenyl hydroxyphenyl ammonumsalt. This article highlights about the overview on hydrazones as spectrophotometric reagents.
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