Isonicotinic acid

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Structural formula
Structure of isonicotinic acid
General
Surname Isonicotinic acid
other names

Pyridine-4-carboxylic acid

Molecular formula C 6 H 5 NO 2
Brief description

white, odorless powder

External identifiers / databases
CAS number 55-22-1
EC number 200-228-2
ECHA InfoCard 100,000,208
PubChem 5922
ChemSpider 5709
Wikidata Q410465
properties
Molar mass 123.11 g mol −1
Physical state

firmly

Melting point

315-319 ° C

pK s value
  • pK s COOH (20 ° C) = 4.84
  • pK s N (20 ° C) = 12.23
solubility

sparingly soluble in water: 6 g l −1 (20 ° C)

safety instructions
GHS labeling of hazardous substances
07 - Warning

Caution

H and P phrases H: 319
P: 260-262-305 + 351 + 338
Toxicological data

5000 mg kg −1 ( LD 50 ,  rat ,  oral )

As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

The isonicotinic acid ( pyridine-4-carboxylic acid ) is an organic compound belonging to the heterocycles : (specifically heteroaromatic counts). They consist of a pyridine ring that is substituted with a carboxy group  (−COOH). Together with the other two isomers, picolinic acid and nicotinic acid, it belongs to the group of pyridinecarboxylic acids with the empirical formula C 6 H 5 NO 2 .

Individual evidence

  1. ↑ a b c d e f Entry on isonicotinic acid in the GESTIS substance database of the IFA , accessed on June 17, 2011(JavaScript required) .
  2. ↑ a b Zvi Rappoport (Ed.): CRC Handbook of Tables for Organic Compound Identification . 3 rd Edition, CRC Press / Taylor and Francis, Boca Raton, FL, 1967, ISBN 0-8493-0303-6 , Acid Dissociation Constants of Organic Acids in Aqueous Solution, S. 432nd

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