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Herbicides

Diquat

Also known as Diquat dication, 9,10-Dihydro-8a,10a-diazoniaphenanthrene, 1,1'-Ethylene-2,2'-bipyridylium ion

CAS 2764-72-9Formula C12H12N2+2Molar mass 184.24 g/molEC 220-433-0
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 5 suppliers listed
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Diquat chemical structure, C12H12N2+2, CAS 2764-72-9
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Crystals
Melting point
<320
Boiling point
Decomposes
Density
1.22 to 1.27 at 68 °F
Solubility
Greater than or equal to 100 mg/mL at 68 °F
HS code
293399
Category
Herbicides
UN number
UN 2781
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Diquat?

Plain description, key identifiers and synonyms

Diquat is the organic cation formed formally by addition of an ethylene bridge between the nitrogen atoms of 2,2'-bipyridine. Most often available as the dibromide. It has a role as a defoliant and a herbicide. It derives from a hydride of a 2,2'-bipyridine.

Diquat is an ion, active substance of a herbicide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
7,10-diazoniatricyclo[8.4.0.02,7]tetradeca-1(14),2,4,6,10,12-hexaene
CAS number
2764-72-9 CAS number cross-checkedOther or deprecated CAS: 231-36-7, 85-00-7
EC number
220-433-0
Molecular formula
C12H12N2+2
UNII
A9A615U4MP
InChIKey
SYJFEGQWDCRVNX-UHFFFAOYSA-N
InChI
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
SMILES (canonical and isomeric)
C1C[N+]2=CC=CC=C2C3=CC=CC=[N+]31

Synonyms

  • Diquat dication
  • 9,10-Dihydro-8a,10a-diazoniaphenanthrene
  • 1,1'-Ethylene-2,2'-bipyridylium ion
  • 1,1'-Ethylene-2,2'-bipyridyldylium ion
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazinediium
  • Dipyrido(1,2-a:2',1'-c)pyrazinediium, 6,7-dihydro-
  • 6,7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium
  • 1,1'-Ethylene-2,2'-dipyridylium dibromide
  • 9,10-Dihydro-8a,10,-diazoniaphenanthrene dibromide
  • 9,10-Dihydro-8a,10a-diazoniaphenanthrene ion
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazine-5,8-di-ium
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazinediylium
  • 6,7-Dihydrodipyrido[1,2-A:2',1'-C]pyrazinediylium
  • 7,10-diazoniatricyclo[8.4.0.02,7]tetradeca-1(14),2,4,6,10,12-hexaene
  • 4-(2-Aminoethyl)benzenesulfonyl Fluoride Hydrochloride, p-(2-Aminoethyl)benzenesulfonyl Fluoride Hydrochloride, Pefabloc, Pefabloc SC, Pefabloc SC Plus
  • C12H12N2+2
  • Dipyrido(1,2-a:2',1'-c)pyrazinediium, 6,7-dihydro- (8CI)(9CI)
  • Quaternary ammonium chloride combination
  • 6,7-Dihydrodipyrido[1,2-a:2',1'-c]pyrazine-5,8-diium
  • Dipyrido[1,2-a:2',1'-c]pyrazinediium, 6,7-dihydro-, dibromide,monohydrate

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Crystalsexp.
Melting point
<320exp.
Boiling point
Decomposesexp.
Density
1.22 to 1.27 at 68 °Fexp.
Solubility
Greater than or equal to 100 mg/mL at 68 °Fexp.
Vapour pressure
Less than 0.000010 mmHg at 68 °Fexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
184.24 g/molcalc.
Exact mass
184.099 Dacalc.
LogP (octanol/water)
0.94calc.
Topological polar surface area
7.76 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
14calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.17calc.
Formal charge
2calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1cc[n+]2c(c1)-c1cccc[n+]1CC2

c1cc[n+]2c(c1)-c1cccc[n+]1CC2

3 rings, 14 atoms. This chemical is the scaffold itself.

8 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H317May cause an allergic skin reaction.
  • H319Causes serious eye irritation.
  • H330Fatal if inhaled.
  • H335May cause respiratory irritation.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (27)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2781

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Diquat suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 5 suppliers
5 of 5 offers
  • Nanjing Source Chemical Co., Ltd
    China, NanjingUnclaimed profile
    DiquatGrade, purity and minimum order on request
    Price on request
    View
  • Shandong Luba Chemical Co.,Ltd.
    China, Jinan ManufacturerUnclaimed profile
    DiquatGrade, purity and minimum order on request
    Price on request
    View
  • Ambinter
    France, OrleansUnclaimed profile
    DiquatGrade, purity and minimum order on request
    Price on request
    View
  • EvitaChem
    China, BeijingUnclaimed profile
    DiquatGrade, purity and minimum order on request
    Price on request
    View
  • OChem Inc
    United States, West ChicagoUnclaimed profile
    DiquatGrade, purity and minimum order on request
    Price on request
    View

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

5 suppliers in 3 countries

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Diquat price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Use classes: Herbicides, Pharmaceuticals, Pesticides.

Pharmacological actions

  • Defoliants, Chemical
  • Herbicides

Roles

  • defoliant
  • herbicide
  • pesticide

Functional uses

  • Biocide

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Diquat is traded under.

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Diquat is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Diquat, based on the data on this page

What is Diquat?

Diquat is the organic cation formed formally by addition of an ethylene bridge between the nitrogen atoms of 2,2'-bipyridine. Most often available as the dibromide. It has a role as a defoliant and a herbicide. It derives from a hydride of a 2,2'-bipyridine.

What is the CAS number of Diquat?

The CAS registry number of Diquat is 2764-72-9. Other or deprecated CAS numbers: 231-36-7, 85-00-7.

What is the molecular formula and weight of Diquat?

The molecular formula of Diquat is C12H12N2+2 and its molar mass is 184.24 g/mol.

What is Diquat used for?

Use classes: Herbicides, Pharmaceuticals, Pesticides.

Is Diquat hazardous?

Diquat carries the GHS signal word "Danger". Main hazards: harmful if swallowed, causes skin irritation, may cause an allergic skin reaction. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Diquat?

Diquat is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Diquat?

CompoundList lists 5 suppliers of Diquat in China, France and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Diquat?

Suppliers quote Diquat on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Diquat

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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