Registration Dossier
Registration Dossier
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A mixture of isomers of: 1,1'-[(3,5(or 2,4 or 4,6 or 2,6)-dihydroxy-o(or m or p)-phenylene)bis(azo-meta-phenyleneazo{1-[3-(dimethylamino)propyl]-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-5,3-diyl})]dipyridinium-dichloride-dihydrochloride; 1-(1-[3-(dimethylamino)propyl]-5-{3-[x-(4-{1-[3-(dimethylamino)propyl]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-pyridinio-3-pyridylazo}phenylazo)-2,4(or 2,6 or 3,5 or 4,6)-dihydroxyphenylazo]phenylazo}-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridyl)pyridinium-dichloride-dihydrochloride (where x is variable)
EC number: 404-540-1 | CAS number: 159405-95-5 BRAUN HM 2763; BROWN HM 2763; BRUN HM 2763; BRUNO HM 2763
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
Waiving.
The substance is a salt and completely dissociates in water; it is in its ionic form within environmentally relevant pH values.
Key value for chemical safety assessment
Additional information
The substance is a salt; the dye part is cationic (pyridinium rings and protonated tertiary amines) and the counter ions are chloride ions (derived from HCl).
Based on the high water solubility, the substance is assumed to be completely dissociated in water. Moreover, within environmentally relevant pH values, i.e. in the range 4-9, the substance is present in its ionic form, based on the molecular structure and pKa values of tertiary amines, typically > 9.5 -10.
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