Diquat

Diquat dibromide
Skeletal formula of diquat
Ball-and-stick model of the component ions of diquat
Names
IUPAC name
6,7-dihydrodipyrido[1,2-a:2′,1′-c]pyrazine-5,8-diium dibromide
Other names
1,1′-Ethylene-2,2′-bipyridyldiylium dibromide
Identifiers
  • Compounds
  • Dibromide: Diquat dibromide
  • Dichloride: Diquat dichloride
  • Dication: Diquat dication
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.001.436 Edit this at Wikidata
KEGG
UNII
  • InChI=1S/C12H12N2.2BrH/c1-3-7-13-9-10-14-8-4-2-6-12(14)11(13)5-1;;/h1-8H,9-10H2;2*1H/q+2;;/p-2 checkY
    Key: ODPOAESBSUKMHD-UHFFFAOYSA-L checkY
  • Dichloride: InChI=1S/C12H12N2.2ClH/c1-3-7-13-9-10-14-8-4-2-6-12(14)11(13)5-1;;/h1-8H,9-10H2;2*1H/q+2;;/p-2
    Key: SKYNPRKUXHXZFJ-UHFFFAOYSA-L
  • Dication: InChI=1S/C12H12N2/c1-3-7-13-9-10-14-8-4-2-6-12(14)11(13)5-1/h1-8H,9-10H2/q+2
    Key: SYJFEGQWDCRVNX-UHFFFAOYSA-N
  • Dibromide: C1[n+]2ccccc2-c3cccc[n+]3C1.[Br-].[Br-]
Properties[1]
C12H12Br2N2
Molar mass 344.050 g·mol−1
Appearance White/yellow crystals
Density 1.61 g/cm3
Melting point Decomposes
71.8% (20 °C)
log P -4.6
Vapor pressure 0.01 mPa (20 °C)
Hazards[3]
GHS labelling:
GHS06: ToxicGHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
4
0
0
NIOSH (US health exposure limits):
REL (Recommended)
 TWA 0.5 mg/m3[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Diquat is the ISO common name[4] for an organic dication that, as a salt with counterions such as bromide or chloride is used as a contact herbicide that produces desiccation and defoliation. Diquat is no longer approved for use in the European Union, although its registration in many other countries including the USA is still valid.

  1. ^ Pesticide Properties Database. "Diquat dibromide". University of Hertfordshire. Archived from the original on 2020-08-08. Retrieved 2020-02-11.
  2. ^ NIOSH Pocket Guide to Chemical Hazards. "#0243". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ Pubchem. "Diquat dibromide". U.S. National Library of Medicine. Archived from the original on 2019-12-17. Retrieved 2020-02-02.
  4. ^ "Compendium of Pesticide Common Names: diquat". BCPC. Archived from the original on 2022-01-24. Retrieved 2022-01-24.