Finding the chemical structure of two reactive dyes

Name: Cristian

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The Chemistry and Application of Dyes (Topics in Applied Chemistry)

Country or region: Romania

Message: Hello! I am a chemistry engineer and I am living in Romania, in the city of Iasi. My speciality is chemistry of dyes (direct dyes, reactive dyes and so on...). I don't find the chemical structure of two reactive dyes: C.I. Reactive Red 267 (Cibacron Scarlet FN-6G) and C.I.Reactive Blue 268 (Cibacron Brilliant Blue FN-G). Would you help me finding these two structures, please? I am waiting your answer! Best wishes!

I'm afraid I don't have these structures. They might be in the Colour Index, but I don't currently have access to this publication.

Do you know how to draw the structure, if you have the name? Reactive Blue 268 is described as being 6,13- Dichlor-3,10-bis{2-[4-fluoro-6-(2-sulfophenylamino)-1,3,5- triazin-2-ylamino]propylamino}benzo[5,6][1,4]oxazino[2,3- .b]phenoxazin-4,11-disulfonic acid, lithium, sodium salts). Its CAS number is 163062-28-0.

I can't find the chemical name or CAS number for Reactive Red 267 and have no further leads.

The Cibacron reactive dyes have been renamed to Novacron, and are now made by Huntsman Textile Effects. At least one of the Cibacron reactive dyes, the beautiful Cibacron Blue F-GF, has been discontinued since the specialty chemicals division of Ciba was purchased by Huntsman. The Cibacron F fiber reactive dyes are monofluorotriazines, very similar in structure and reactions to the dichlorotriazines, which are called Procion MX dyes. Hand dyers in the US often buy them from PRO Chemical & Dye, in their line of Sabracron F dyes.

UPDATE as of July 6, 2011: Dr. Dambe, of India, has kindly alerted me to a site with a drawing of the chemical structure for reactive blue 268, CAS No.163062-28-0, Cibacron Brilliant Blue FN-G. The following image is from Chemfamily.com:

4,11-Triphenodioxazinedisulfonic acid, 6,13-dichloro-3,10-bis2-4-fluoro-6-(2-sulfophenyl)amino-1,3,5-triazin-2-ylaminopropylamino-, lithium sodium salt163062-28-0

As you can see, it has the monofluorotriazine group typical of the Cibacron F dyes, along with a triphenodioxazine-based blue chromophore; it is symmetrical and bifunctional. It differs from the structure given by Dr. Steve Mihok for Cibacron Blue F-GF only in the number of sulfonic groups on the rings at the extreme ends of the molecular structure, plus the mention of the lithium ions.

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Posted: Friday - September 17, 2010 at 09:10 PM

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Finding the chemical structure of two reactive dyes

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