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Mordant brown 33
Wireframe model of a mordant brown 33 tautomer
Names
Systematic IUPAC name Sodium 2,4-diamino-5-benzene-1-sulfonate
Other names Mordant brown 33
Chrome Brown RH
Sodium 2,4-diamino-5-benzenesulfonate
Identifiers
CAS Number
3D model (JSmol)
Abbreviations MB33
ChemSpider
EC Number
  • 222-810-5
PubChem CID
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C12H11N5O6S.Na/c13-7-4-8(14)12(24(21,22)23)5-9(7)15-16-10-3-6(17(19)20)1-2-11(10)18;/h1-5,15H,13-14H2,(H,21,22,23);/q;+1/p-1Key: CKWUOVPZRGZTSZ-UHFFFAOYSA-M
  • InChI=1S/C12H11N5O6S.Na/c13-7-4-8(14)12(24(21,22)23)5-9(7)15-16-10-3-6(17(19)20)1-2-11(10)18;/h1-5,15H,13-14H2,(H,21,22,23);/q;+1/p-1/b16-10+;
  • InChI=1S/C12H11N5O6S.Na/c13-7-4-8(14)12(24(21,22)23)5-9(7)15-16-10-3-6(17(19)20)1-2-11(10)18;/h1-5,15H,13-14H2,(H,21,22,23);/q;+1/p-1/b16-10+;Key: CKWUOVPZRGZTSZ-QFHYWFJHSA-M
SMILES
  • .O=C2/C=C\C(=C/C2=N\Nc1cc(c(N)cc1N)S()(=O)=O)()=O
Properties
Chemical formula C12H10N5NaO6S
Molar mass 375.29 g·mol
Hazards
GHS labelling:
Pictograms GHS05: CorrosiveGHS07: Exclamation markGHS08: Health hazard
Signal word Warning
Hazard statements H317, H318, H341
Precautionary statements P201, P202, P261, P272, P280, P281, P302+P352, P305+P351+P338, P308+P313, P310, P321, P333+P313, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Mordant brown 33 (MB33) is 2,4-diamino-5-(2-hydroxy-5-nitrophenylazo) benzene sulfonic acid sodium salt.

The UV-Visible spectra of MB33 in all mixtures investigated display three absorption bands in 50% ethanol within all the pH ranges 1.5-13.3 using Thiel buffer the maximum absorption of these bands is located at 438, 453 and a double head band at 410 and 475 nm . The band at 438 nm corresponds to absorption attributed to the cationic form (LH6) of MB33 (whereas L indicates to the parent structure of ligand without hydrogen protons) and disappears at pH > 3.0. The band at 453 nm corresponds to the absorption of the neutral form of the reagent (LH5-). The double head bands at 410 and 475 nm correspond to the di-anionic (LH4) of MB33.

References

  1. M. M. Seleim, M. S. Abu-Bakr, E.Y. Hashem and A. M. El-Zohry; Spectrophotometric determination of manganese (II) with Mordant Brown 33 in the presence of Tween 20 in some foods; Canadian Journal of Analytical Sciences and Spectroscopy, Volume 54, No. 2, 2009. - www.researchgate.net
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