I am looking for the molecular formula for Acid Yellow 19

Name: Kimber

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Linda Knutson's book
Synthetic Dyes for Natural Fibers

Country or region: USA - Ohio

Message: I am looking for the molecular formula for PRO washfast acid yellow 119. Your site states that the C.I. is Acid Yellow 19, but I'm having difficulty locating either the CAS# or the molecular formula. Can you help? Thanks in advance.

It looks like Colour Index Acid Yellow 19 is CAS No. 12220-64-3. The trick in searching is the careful use of quotation marks to group your phrases. I did a search with double quotes around "acid yellow 19" plus "CAS", and poked around a bit until I found a CAS number that other sites identified as having the right Colour Index name.

The molecular formula is given as C₂₀H₁₂Cl₂N₄Na₂O₇S₂, and the IUPAC name as disodium 2-{2-[1-(2,5-dichloro-4-sulfonatophenyl)-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-4-yl]diazen-1-yl}naphthalene-1-sulfonate. Here's an image from LookChem.com's Acid Yellow 19 page:

Here's a nicer drawing from ChemDatas.com, without the slightly confusing "Me" for that methyl group (which is not part of the way I'm used to drawing molecular structures), albeit with a perfectly reasonable watermark:

Chemicalbook.com has another nice drawing:

I see from searching for the CAS number that Dharma Trading Company has an MSDS for acid yellow 19 on their site, as evidently it's included among their new line of Dharma Acid Dyes. That would have been another good place to look. The same dye is included in the Jacquard Acid Dye collection as their #602 Bright Yellow. The MSDS for Dharma's brand of acid yellow 19 has the CAS number listed on it, but the MSDS pages for the Jacquard brand and the ProChem Washfast dyes don't include CAS numbers.

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Posted: Sunday - February 06, 2011 at 01:31 PM

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I am looking for the molecular formula for Acid Yellow 19

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