Collidinic acid (pyridine-2,4,6-tricarboxylic acid) is an organic compound that belongs to the
heterocycles (more precisely the heteroaromatics). It belongs to the group of
pyridinetricarboxylic acids and consists of a
pyridine
Pyridine is a basic (chemistry), basic heterocyclic compound, heterocyclic organic compound with the chemical formula . It is structurally related to benzene, with one methine group replaced by a nitrogen atom . It is a highly flammable, weak ...
ring which carries three
carboxy groups in the 2-, 4- and 6-positions. The name is derived from
2,4,6-collidine
2,4,6-Trimethylpyridine (2,4,6-collidine) is an organic compound which belongs to the Heterocyclic compound, heterocycles (more precisely, Heteroaromatic compound, heteroaromatics). It consists of a pyridine ring substituted with three methyl grou ...
(2,4,6-trimethylpyridine).
Preparation
The compound can be obtained from the
oxidation
Redox ( , , reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is ...
of
2,4,6-collidine
2,4,6-Trimethylpyridine (2,4,6-collidine) is an organic compound which belongs to the Heterocyclic compound, heterocycles (more precisely, Heteroaromatic compound, heteroaromatics). It consists of a pyridine ring substituted with three methyl grou ...
by
potassium permanganate
Potassium permanganate is an inorganic compound with the chemical formula KMnO4. It is a purplish-black crystalline salt, which dissolves in water as K+ and ions to give an intensely pink to purple solution.
Potassium permanganate is widely us ...
.
Uses
Collidinic acid can be used in the
spectrophotometric
Spectrophotometry is a branch of electromagnetic spectroscopy concerned with the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength. Spectrophotometry uses photometers, known as spe ...
determination of
iron
Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...
.
References
Pyridines
Tricarboxylic acids
Aromatic acids
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