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Title: Diquat  
Author: World Heritage Encyclopedia
Language: English
Subject: Herbicides, Pesticide poisoning, Herbicide, Desiccants, Tribune (disambiguation)
Collection: Desiccants, Herbicides, Nitrogen Heterocycles, Quaternary Ammonium Compounds
Publisher: World Heritage Encyclopedia


Diquat dibromide
Skeletal formula of diquat
Ball-and-stick model of the component ions of diquat
IUPAC name
6,7-Dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium dibromide
Other names
1,1'-Ethylene-2,2'-bipyridyldiylium dibromide
ChemSpider  Y
Jmol-3D images Image
Molar mass 344.05 g·mol−1
Appearance Yellow crystals[1]
Density 1.22 - 1.27 g/cm3
Melting point 335 °C (635 °F; 608 K)
Boiling point Decomposes[1]
70% (20°C)[1]
Vapor pressure <0.00001 mmHg (20°C)[1]
US health exposure limits (NIOSH):
PEL (Permissible)
REL (Recommended)
TWA 0.5 mg/m3[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Diquat is a contact herbicide that produces desiccation and defoliation most often available as the dibromide, diquat dibromide.[2] Brand names for this formulation include Aquacide, Dextrone, Preeglone, Deiquat, Detrone, Reglone, Reglon, Reglox, Tribune, Ortho-Diquat, Weedtrine-D,[3] Weedol 2 and, in combination with glyphosate, Resolva.[4]

Diquat is a non-selective herbicide that acts quickly to damage only those parts of the plant to which it is applied.[5] It has been used in pre-harvest [5]

Diquat dibromide is moderately toxic. It may be fatal to humans if swallowed, inhaled, or absorbed through the skin in large quantities.[5]


Pyridine is oxidatively coupled to 2,2'-bipyridine over a heated Raney nickel catalyst. The ethylene bridge is formed by the reaction with 1,2-dibromoethane:[7]

See also


  1. ^ a b c d e f g "NIOSH Pocket Guide to Chemical Hazards #0243".  
  2. ^ Merck Index, 11th Edition, 3359.
  3. ^ PubChem listing for diquat dibromide
  4. ^ Weedkillers for Home Gardeners. RHS Advisory Service, Royal Horticultural Society, February 2013. Accessed May 2013.
  5. ^ a b c EXTOXNET, Pesticide Information Project
  6. ^ "The agronomic benefits of glyphosate in Europe" (PDF).  
  7. ^ "Paraquat and Diquat".  
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