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318825

Sigma-Aldrich

Congo Red solution

0.1 wt. % in H2O

Synonym(s):

Congo, Congo Red 4B, Cosmos Red, Cotton Red B or C, Direct Red 28, Direct Red, C,R, or Y

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About This Item

Empirical Formula (Hill Notation):
C32H22N6Na2O6S2
CAS Number:
Molecular Weight:
696.66
Beilstein:
3894858
MDL number:
UNSPSC Code:
12171500

concentration

0.1 wt. % in H2O

pH

3.0-5.0, blue to red

density

0.995 g/mL at 25 °C

λmax

497 nm

SMILES string

[Na+].[Na+].Nc1c(cc(c2ccccc12)S([O-])(=O)=O)\N=N\c3ccc(cc3)-c4ccc(cc4)\N=N\c5cc(c6ccccc6c5N)S([O-])(=O)=O

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