Iminodiacetic acid

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Iminodiacetic acid
Skeletal formula of iminodiacetic acid
Preferred IUPAC name
2,2'-Azanediyldiacetic acid
Other names
2-(Carboxymethylamino)acetic acid
Diglycolamidic acid
3D model (JSmol)
ECHA InfoCard 100.005.051
EC Number 205-555-4
MeSH imnodiacetic+acid
RTECS number AI2975000
Molar mass 133.103 g·mol−1
Appearance Colourless crystals
Density 1.436 g mL−1
log P 1.84
Acidity (pKa) 1.873
Basicity (pKb) 12.124
−933.9–−931.3 kJ mol−1
−1.6430–−1.6406 MJ mol−1
GHS pictograms GHS07: Harmful
GHS signal word WARNING
H315, H319, H335
P261, P305+351+338
Flash point 178 °C (352 °F; 451 K)
Related compounds
Related alkanoic acids
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Iminodiacetic acid, HN(CH2CO2H)2, often abbreviated to IDA, is a dicarboxylic acid amine (the nitrogen atom forms a secondary amino group, not an imino group as the name suggests). The iminodiacetate anion can act as a tridentate ligand to form a metal complex with two, fused, five membered chelate rings.[1] The proton on the nitrogen atom can be replaced by a carbon atom of a polymer to create an ion-exchange resin, such as chelex 100.

A tridentate metal complex with the iminodiacetate anion

IDA forms stronger complexes than the bidentate ligand glycine and weaker complexes than the tetradentate ligand nitrilotriacetic acid. It can also act as a bidentate ligand through its two carboxylate groups. Several technetium-99m complexes are used in cholescintigraphy scans (also known as hepatobiliary iminodiacetic acid scans) to evaluate the health and function of the gallbladder.[2][3]

Iminodiacetic acid is an important intermediate in one of the two main industrial processes used to manufacture the herbicide glyphosate. It is used in capillary electrophoresis for modulating peptide mobility. It is also used as a precursor for the manufacture of the indicator xylenol orange.

See also[edit]


  1. ^ Schwarzenbach, G (1952). "Der Chelateffekt". Helv. Chim. Acta. 35 (7): 2344–2359. doi:10.1002/hlca.19520350721.
  2. ^ Michael, Picco. "HIDA scan (cholescintigraphy): Why is it performed?". Mayo Clinic. Retrieved 11 December 2007.
  3. ^ Krishnamurthy, Gerbail T.; Krishnamurthy, Shakuntala (2009). "Imaging Agents". Nuclear Hepatology: A Textbook of Hepatobiliary Diseases. Springer. pp. 54–57. ISBN 978-3-642-00647-0. Retrieved 19 December 2015.