Triphenylmethane (C6H5)3CH is the chromogen that produces the intense colors in many dyes. It has a common p-quinoid chromophore and auxochromes like OH, NH2, and NR2 that determine the color. While triphenylmethane dyes produce brilliant colors, they fade quickly in light and are no longer used much for textiles. However, they are still used in large quantities for coloring paper and typewriter ribbons where fading is less important. Gentian violet, derived from triphenylmethane, is used as an antiseptic for fungal infections and minor wounds. Triphenylmethane and its derivatives also have various other uses including as pH indicators,

1. Mr. Pradeep Swarnkar
Associate Professor

2. Triphenylmethane (C6H5)3CH is the chromogen of a large
number of dyes. The common chromophore is the p-quinoid
structure and the auxochromes are OH,NH2 and NR2.

3. Triphenylmethane dyes are very brilliant intense colors but
fade quickly in light. Therefore , they are no longer much
used on textiles. However, they are used in large quantities for
coloring paper and typewriter ribbons where pastness to light
is not so important.

4. Preparation of Triphenylmethane :

6. Derivatives of Triphenylmethane:

7. Gentian violet is an antiseptic dye used to
treat fungal infections of the skin (e.g.,
ringworm, athlete's foot). It also has weak
antibacterial effects and may be used on
minor cuts and scrapes to prevent
infection.

8. It can be used as pH indicator with pH transition
range 5.0 - 6.8.
It is used as an intermediate in manufacturing
of dyes.
Aurin

9. used as a histological stain and in
Gram's method of classifying
bacteria.

10. used as a dye for materials such as silk,
leather, and paper.

11. Medicinal uses of triphenylmethane:

12. Crystal violet used as preparation of detergents , fertilizers,
textile dye.
Triphenylmethane is used in copying papers, in hectograph
and printing inks.