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Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: 2-Methyl-4(5)-nitroimidazoles reacted with Ninhydrin to yield a characteristic green color, a new color reaction for this reagent and appears to involve condensation of the ninhydrin molecule on an active methylene group on an imidazole ring.
16 citations
15 citations
TL;DR: In this article, the decomposition of Gibbs reagents (2,6-dichloro- and 2, 6-dibromoquinonechloroimines) in solution is shown to occur first under the formation of the quinoneimine (which reacts very rapidly with phenol and is the operative species in the colour reaction) and then products (one of which is the tetrahaloindophenol derivative) which do not react with phenols.
Abstract: The decomposition of the Gibbs reagents (2,6-dichloro- and 2,6-dibromoquinonechloroimines) in solution is shown to occur first under the formation of the quinoneimine (which reacts very rapidly with phenol and is the operative species in the colour reaction) and then products (one of which is the tetrahaloindophenol derivative) which do not react with phenol. The rate decomposition increases with increasing pH. The reagents, when purified by crystallisation fromn-heptane and kept in the dark at room temperature, are stable. Stock 0.01M solutions in ethanol or acetone are stable for at least 6 months if stored in a refrigerator. The optimum pH for the colour reaction with phenols is 8.5. Borate, phosphate or Britton-Robinson buffers are suitable, but not ammonia or glycocoll buffers.
15 citations
15 citations
TL;DR: A new, selective and sensitive on-site spectrophotometric method for the determination of antimony at trace level in water, soil and dust samples of Central India has been demonstrated.
15 citations