Primuline



Primuline
Identifiers
CAS number 8064-60-6
SMILES NC(C=C3)=CC=C3C2=NC1=CC=C(C4=NC5=C(C(S

(=O)([O-])=O)=C(C)C=C5)S4)C=C1S2

Properties
Molecular formula C21H15N3O3S3 (free acid)
Molar mass 453.557 g/mol (free acid)
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Primuline is a benzothiazole ring system. Primuline itself is also known as Direct yellow 7, Carnotine, or C.I. 49010.

The primulines are considered derivatives of dehydrothiotoluidine (aminobenzenyltoluylmercaptan), which is obtained when sulphur for eighteen hours at 180-190 °C and then for a further six hours at 200-220 °C[1] Dehydrothiotoluidine is not itself a dye-stuff, but if the heating is carried out at a higher temperature in the presence of more sulphur, then a base is formed, which gives primuline yellow upon sulphonation.[2]

Primuline yellow is a mixture of sodium salts and probably contains at least three thiazole rings in combination. It is a substantive diazotized on the fibre and then developed with other components, yielding a series of ingrain colors.

Primuline is usually available as a sodium salt. Primuline is fluorescent.

Thioflavin T is obtained by the cotton a beautiful yellow.

References

  1. ^ P. Jacobson (1889). "N/A". Ber. 22: 333.
    L. Gatterrnann, ibid. p. 1084
  2. ^ A. G. Green (1888). "N/A". Journ. Soc. Chem. Ind. 1: 194.
  • This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
 
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