Metanilic acid

Metanilic acid
Names
Preferred IUPAC name
3-Aminobenzene-1-sulfonic acid
Other names
3-Aminobenzenesulfonic acid
m-Anilinesulfonic acid
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.067
EC Number
  • 204-473-6204-473-6
UNII
UN number 2585
  • InChI=1S/C6H7NO3S/c7-5-2-1-3-6(4-5)11(8,9)10/h1-4H,7H2,(H,8,9,10)
  • Nc1cccc(S(=O)(=O)O)c1
Properties
C6H7NO3S
Molar mass 173.19 g·mol−1
Appearance Beige powder
Density 1.69
Melting point >300 °C (lit.)
Less than 1 mg/mL at 22 °C (72 °F)
Acidity (pKa) 3.74 (H2O)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Metanilic acid is an isomer of sulfanilic acid with molecular formula C
6H
7NO
3S and molecular weight 173.18968 g/mol.[2][3][4][5] It is a white powder that is slightly soluble in water.

Disappearing polymorph

The crystal structure called Form I is a disappearing polymorph that cannot be produced by researches anymore while Form II and III still exist.[6] The reason for this is that Form I is converted to another polymorph upon contact with a seed crystal and most places are contaminated with tiny amounts of Form II or III that are enough to prevent any viable amounts of Form I to be produced.

See also

References

  1. ^ Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. pp. 5–88. ISBN 978-1498754286.
  2. ^ Pubchem. "3-AMINOBENZENESULFONIC ACID - C6H7NO3S - PubChem". NIH.
  3. ^ "Metanilic acid - 121-47-1".
  4. ^ "Metanilic acid".
  5. ^ "METANILIC ACID (3-AMINO-BENZENESULFONIC ACID)".
  6. ^ Rubin-Preminger JM, Bernstein J (2005-07-01). "3-Aminobenzenesulfonic Acid: A Disappearing Polymorph". Crystal Growth & Design. 5 (4): 1343–1349. doi:10.1021/cg049680y. ISSN 1528-7483.


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