Metanilic acid
Appearance
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Names | |
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Preferred IUPAC name
3-Aminobenzene-1-sulfonic acid | |
Other names
3-Aminobenzenesulfonic acid
m-Anilinesulfonic acid | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.004.067 |
EC Number |
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PubChem CID
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UNII | |
UN number | 2585 |
CompTox Dashboard (EPA)
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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).
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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
[edit]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
[edit]References
[edit]- ^ Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. pp. 5–88. ISBN 978-1498754286.
- ^ Pubchem. "3-AMINOBENZENESULFONIC ACID - C6H7NO3S - PubChem". NIH.
- ^ "Metanilic acid - 121-47-1".
- ^ "Metanilic acid".
- ^ "METANILIC ACID (3-AMINO-BENZENESULFONIC ACID)".
- ^ 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.