Alizarin Yellow R
Encyclopedia
Alizarine Yellow R is a yellow
colored azo dye made by the diazo
coupling reaction
. It usually comes as a sodium salt. In its pure form it is a rust-colored solid.
.
Yellow
Yellow is the color evoked by light that stimulates both the L and M cone cells of the retina about equally, with no significant stimulation of the S cone cells. Light with a wavelength of 570–590 nm is yellow, as is light with a suitable mixture of red and green...
colored azo dye made by the diazo
Diazo
Diazo refers to a type of organic compound called diazo compound that has two linked nitrogen atoms as a terminal functional group. The general formula is R2C=N2. The simplest example of a diazo compound is diazomethane...
coupling reaction
Coupling reaction
A coupling reaction in organic chemistry is a catch-all term for a variety of reactions where two hydrocarbon fragments are coupled with the aid of a metal catalyst...
. It usually comes as a sodium salt. In its pure form it is a rust-colored solid.
Special properties
Alizarine Yellow R is a pH indicatorPH indicator
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH of the solution can be determined visually. Hence a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model. Normally, the indicator causes the...
.