Colour part 3

Question 1

Define Auxochrome

Answer 1

“colour helper” substituent on aromatic ring that extends the conjugation.

Question 2

Define Chromophore

Answer 2

part of molecule responsible for colour.

Question 3

Define Azo groups:

Answer 3

N=N

Most common functional group in organic dyes and pigments 60-70%

• Good techniquical properties
• Cover all colour ranges
• Varying solubility

Question 4

Define Photochromism

Answer 4

Reversible light induced colour change. Ie colour changing glasses

Question 5

Define Tautomerization

Answer 5

movement of proton (hydrogen) - move intense colour

Question 6

Define Stability to degradation

Answer 6

stability due internal H-bonding, results in good tech. properties.

Question 7

What is an Azo Mordants?

Answer 7

forms a complex (mixing dye with metal ions)

Question 8

What is are Azo direct dyes?

Answer 8

Adhesives directly upon application

Question 9

What is a Carbonyl Colourants

Answer 9

( C= ) chromophoric unit