Mordant brown 33

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

Mordant brown 33

Names
Systematic IUPAC name Sodium 2,4-diamino-5-[2-(3-nitro-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazin-1-yl]benzene-1-sulfonate
Other names Mordant brown 33 Chrome Brown RH Sodium 2,4-diamino-5-[2-(3-nitro-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazin-1-yl]benzenesulfonate
Identifiers
CAS Number	1082653-05-1 N 3618-62-0 (non-specific) Y
3D model (JSmol)	Interactive image
Abbreviations	MB33
ChemSpider	7850278 (1E) Y 4588144 (1Z) Y
EC Number	222-810-5
PubChem CID	135414428 9575826 (1E) 5483143 (1Z)
UNII	HW6KSE69YM Y
CompTox Dashboard (EPA)	DTXSID0063101
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-1 N Key: CKWUOVPZRGZTSZ-UHFFFAOYSA-M N 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 [Na+].O=C2/C=C\C(=C/C2=N\Nc1cc(c(N)cc1N)S([O-])(=O)=O)[N+]([O-])=O
Properties
Chemical formula	C12H10N5NaO6S
Molar mass	375.29 g·mol−1
Hazards
GHS labelling:
Pictograms
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 [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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 (LH₄²⁻) of MB33.^[1]

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