Organochromic Indicators
Indicators are chemical substances that change color when expose to different pH levels. Taken together, a group of indicators can create an entire spectrum that gives a scientist a very good idea of the likely pH of a substance in solution.
Among the indicators used are organochromic indicators. Chromium (II) chloride is typically a part of these substances. Chromium chloride is a metallic salt with strong reducing properties. When dissolved in water, chromium chloride makes a bright blue solution.
Organochromic indicators are used to detect pH in organic solutions and organometallic complexes. Organochromic reagents are also very powerful synthetically because they are not terribly electronegative; they also allow for a wide range of substrates. Alkyl chromium reagents are the most common, for aldehydes.
Organochromium indicators generally have a reduction reaction if organics are present; the bright blue color of the solution fades in response to the reduction of carbon-carbon unsaturated bonds. Nitrobenzene is very reactive with organochromiums, and can be reduced to aldehydes. Organochromiums are also handy because they dissolve readily in alcohol as well as water, giving more flexibility.
Web Resources On Organochromic Indicators
pplication of dichromated gelatin for dry developed lithographic techniques on GaAs
A new series of homoleptic, paramagnetic organochromium derivatives: synthesis, characterization, and study of the magnetic properties.
Book Resources On Organochromic IndicatorsA guide to qualitative organic analysis,: Including the indicator method of classification by David Davidson
Organochromium Compounds by R. P. A Sneeden
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