Table 4.1
Some of the common azo dye structure and characteristics
S. No.
Common
name
IUPAC name
Chemical Structure
Molecular formula
Molecular
weight
1
Reactive
orange 16
hydroxy-3[[4-(2 sulfonatooxyethylsulfonyl)
phenyl]diazenyl]naphthalene-2sulfonate
NaO
3 SOH
2 CH
2 CO
2 S
NaO
3 S
N
N
HO
H
N COCH
3
C
20 H
17 N
3 Na
2 O
11 S
3
617.5 g/
mol
2
Congo red
[[4-[4-[(1-amino-4sulfonatonaphthalen-2-yl)
diazenyl]phenyl]phenyl]
diazenyl]naphthalene-1-sulfonate
C
32 H
22 N
6 Na
2 O
6 S
2
696.7 g/
mol
3
Acid orange
7
Sodium;4[(2-hydroxynaphthalen-1-yl)
diazenyl]benzenesulfonate
C
16 H
11 N
2 NaO
4 S
350.3 g/
mol
122
P. Shandilya et al.