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Insecticides and acaricides

Phosphonium

Also known as phosphorus cation, lambda(5)-phosphane, phosphorus(1+) ion

CAS 16749-13-6Formula H4P+Molar mass 35.01 g/mol
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Phosphonium chemical structure, H4P+, CAS 16749-13-6
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
16749-13-6
Formula
H4P+
Molar mass
35.01 g/mol
HS code
285390
Category
Insecticides and acaricides

What is Phosphonium?

Plain description, key identifiers and synonyms

Phosphonium is a phosphorus hydride and an onium cation. It is a conjugate acid of a phosphane.

Phosphonium is a polyatomic cation.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
phosphanium
CAS number
16749-13-6 CAS number cross-checkedOther or deprecated CAS: 13769-19-2, 16427-80-8
Molecular formula
H4P+
UNII
094H06A71I
InChIKey
XYFCBTPGUUZFHI-UHFFFAOYSA-O
InChI
InChI=1S/H3P/h1H3/p+1
SMILES (canonical and isomeric)
[PH4+]

Synonyms

  • phosphorus cation
  • lambda(5)-phosphane
  • phosphorus(1+) ion
  • phosphorus(I) cation
  • Phosphonium cation
  • PH4(+)
  • [PH4](+)
  • (PH4)(+)
  • phosphanium
  • Phosphorane
  • phosphorus(1+)
  • Mono-phosphonium
  • tetrahydridophosphorus(1+)
  • Phosphine, conjugate acid
  • lambda5-phosphorane
  • Phosphorus pentahydride
  • hydridophosphorus(1+)
  • Phosphine conjugate acid
  • Phosphorus, ion (P1+)

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
35.01 g/molcalc.
Exact mass
35.0045 Dacalc.
LogP (octanol/water)
-0.21calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
1calc.
Stereocentres
1calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Phosphonium suppliers

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

All 2 suppliers

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

2 suppliers in 1 country

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Phosphonium price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Roles

  • aetiopathogenetic role
  • carcinogenic agent
  • fumigant
  • fumigant insecticide
  • insecticide
  • pesticide

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 Phosphonium is traded under.

HS 2853.90Indicative HS code

Phosphides, whether or not chemically defined, excluding ferrophosphorus, other, other

World exports in 2024
$2.45B
−33.6% vs 2023, imports $816M
2019 to 2024
Top exporters
  1. China68.4%
  2. Israel8.1%
  3. United States4.9%
Top importers
  1. United States19.3%
  2. Japan17.9%
  3. China13.4%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Phosphonium is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Phosphonium?

Phosphonium is a phosphorus hydride and an onium cation. It is a conjugate acid of a phosphane.

What is the CAS number of Phosphonium?

The CAS registry number of Phosphonium is 16749-13-6. Other or deprecated CAS numbers: 13769-19-2, 16427-80-8.

What is the molecular formula and weight of Phosphonium?

The molecular formula of Phosphonium is H4P+ and its molar mass is 35.01 g/mol.

What is Phosphonium used for?

Known uses and roles of Phosphonium include insecticides in agriculture and crop protection, aetiopathogenetic role, carcinogenic agent, fumigant, fumigant insecticide and 2 more.

Is Phosphonium hazardous?

No GHS hazard classification for Phosphonium is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Phosphonium?

Phosphonium is usually classified under HS code 285390 (Phosphides, whether or not chemically defined, excluding ferrophosphorus, other…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Phosphonium?

CompoundList lists 2 suppliers of Phosphonium in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Phosphonium?

Suppliers quote Phosphonium 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 Phosphonium

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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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