Phosphorus tetrafluoride ion Lewis Structure

Phosphorus tetrafluoride ion Lewis Structure: F₄P Lewis Structure, seesaw Geometry, sp3d Hybridization & Polarity

Phosphorus tetrafluoride ion Key Facts

The Phosphorus tetrafluoride ion Lewis structure is P–F single bond, P–F single bond, P–F single bond and P–F single bond; the central P has 5 electron domains (1 lone pair), giving a trigonal bipyramidal electron-domain arrangement and a seesaw molecular geometry with a ≈90° / 120° bond angle. P is best described as sp3d-hybridized, and Phosphorus tetrafluoride ion is polar because the seesaw shape (and/or unequal terminal atoms) prevents cancellation of the bond dipoles.

Figure 1: Lewis Structure of Phosphorus tetrafluoride ion (F₄P)

Chemical Formula	F₄P
CAS Number	14637-70-8
Net Charge	-1
Total Valence Electrons	34
Lewis Structure	P–F single bond, P–F single bond, P–F single bond and P–F single bond
Electron-Domain Geometry	trigonal bipyramidal
Molecular Geometry	seesaw
Hybridization Model	sp3d (central P)
Bond Angle	≈90° / 120°
Polarity	Polar molecule

PubChem and NIST list Phosphorus tetrafluoride ion as F ₄P with CAS 14637-70-8; molecular weight ≈ None g/mol. View CAS 14637-70-8 dictionary details on Guidechem →

Applications of Phosphorus tetrafluoride ion (CAS 14637-70-8)

In aqueous and process chemistry, F₄P exists as the anion Phosphorus tetrafluoride ion ion. It is encountered as a counterion and a controlled source of P in salts, buffers, electrochemistry and analytical protocols, and as a reactant in syntheses that require a defined equivalent of P-containing material.

Ion Source / Counterion Supplied as salts and solutions; specify hydration, counter-cation and concentration.

Analytical & Electrochemical Used in titrations, plating baths and ionic-strength control where the ion is the active species.

Synthesis Reagent A controlled source of P in precipitation, complexation and redox procedures.

Procurement Note "Phosphorus tetrafluoride ion" is supplied in multiple commercial grades and package sizes. Specify purity, grade, moisture/impurity limits, package (cylinder, drum or bulk) and intended process, and use CAS 14637-70-8 as the primary identifier when screening suppliers; always confirm regional availability and safety documentation (SDS).

Step 1 - Valence Electrons & Central Atom

To draw the Phosphorus tetrafluoride ion Lewis structure we first count the total valence electrons. F₄P contains 4×7 (F) + 5 (P) − 1 (net anion); the net charge of -1 gives a total of 34 valence electrons to place.

The central atom is P. It is the least electronegative atom capable of forming multiple bonds and is surrounded by the more electronegative terminal atom(s); hydrogen, when present, always occupies a terminal position. Electronegativity considerations place the electron density toward the terminal atom(s).

Valence-electron count

Total valence electrons = 4×7 (F) + 5 (P) − 1 (net anion) = 34 electrons.

Step 2 - Lewis Structure & Electron Distribution

Place P at the center and connect each surrounding atom with a single bond, complete octets on the terminal atoms, and place any remaining electrons on the central atom. The resulting electron distribution is: P–F single bond, P–F single bond, P–F single bond and P–F single bond; one lone pair on P.

Counting bonding and nonbonding electrons around P therefore satisfies the octet/expanded-octet requirement for the drawn structure.

P–F P–F P–F P–F

P: 1 lone pair, 4 bonding domains

4 bonding domains + 1 lone pairs = 5 electron domains

Expanded Octet: d-Orbital Participation Central P belongs to period 3 or below, so it can accommodate more than eight electrons: low-lying d orbitals become available and the seesaw arrangement with 5 domains reflects this expanded valence shell. The octet rule alone does not apply to such hypervalent species.

Step 3 - VSEPR Theory & Geometry

VSEPR theory states that the 5 electron domains around P arrange to minimize mutual repulsion, giving an trigonal bipyramidal electron-domain geometry.

Because 1 of these domains are lone pair(s) — and lone pairs repel more strongly than bonding pairs — the observed molecular geometry is seesaw; the P bond angle is set to ≈90° / 120° rather than the ideal value for the electron-domain geometry.

Repulsion hierarchy

A useful VSEPR approximation is: lone pair–lone pair repulsion > lone pair–bonding pair repulsion > bonding pair–bonding pair repulsion. With 1 lone pair(s) on P, the lone-pair domains occupy positions that minimize overall repulsion while pushing the bonding domains (and therefore the bonded atoms) closer together.

Hybridization & Formal Charge

In the conventional localized-bond model, P uses sp3d hybrid orbitals to form the 5 equivalent electron-domain directions (4 bonding + 1 lone pair).

Formal-charge check

Formal charge on central P = V − N − ½B = 5 − 2 − ½×8 = -1. The nonzero formal charge is distributed by resonance / charge separation; the drawn structure is the lowest-energy contributor.

Modeling Note Modeling Note: sp3d / sp3d hybridization is a convenient localized-bond teaching model. Modern quantum-chemical descriptions of hypervalent Phosphorus tetrafluoride ion use molecular orbitals and do not require populated d orbitals as the primary bonding picture.

Is Phosphorus tetrafluoride ion Polar or Nonpolar?

Phosphorus tetrafluoride ion is polar. The seesaw shape prevents cancellation of the bond dipoles. The bond dipoles do not cancel, leaving a net molecular dipole, which strongly influences solvation behavior and intermolecular interactions.

Expert Quote — Structural Chemistry Perspective

The decisive structural fact is not simply that the individual bonds are polar; it is whether molecular symmetry allows their vector sum to vanish. In Phosphorus tetrafluoride ion the seesaw arrangement prevents cancellation, so a permanent dipole remains.

Interpretation consistent with standard VSEPR / molecular-geometry references.

This polarity profile underpins its behavior as a solvent, reactant or process intermediate; when sourcing, specify grade and container compatibility.

Structural Comparison Table

Species	Formula	Central Atom	Electron Domains	Molecular Geometry	Polarity
Phosphorus tetrafluoride ion	F₄P	P	5	seesaw	Polar
Phosphine	H₃P	P	4	trigonal pyramidal	Polar
Phosphorus trichloride	Cl₃P	P	4	trigonal pyramidal	Polar
Phosphorus pentachloride	Cl₅P	P	5	trigonal bipyramidal	Nonpolar
Phosphorus trifluoride	F₃P	P	4	trigonal pyramidal	Polar
Phosphorus pentafluoride	F₅P	P	5	trigonal bipyramidal	Nonpolar

Practice question Starting from the 34 valence electrons of F₄P, draw the Lewis structure and confirm the central P atom is sp3d-hybridized with seesaw geometry. What happens to the bond angle if one terminal atom is replaced by a more electronegative substituent?

Looking for industrial bulk or specified-grade supplies of Phosphorus tetrafluoride ion (CAS 14637-70-8)? Browse Supplier on Guidechem →

FAQs

Is F₄P polar or nonpolar?

Phosphorus tetrafluoride ion is polar. Its seesaw geometry (and/or unequal terminal atoms) stops the bond dipoles from cancelling.

What is the Lewis structure of Phosphorus tetrafluoride ion?

P–F single bond, P–F single bond, P–F single bond and P–F single bond; one lone pair on P. It uses all 34 valence electrons and the preferred structure carries a formal charge of -1 on the central atom.

What is the bond angle in Phosphorus tetrafluoride ion?

The P angle is about ≈90° / 120°. Lone-pair repulsion compresses the angle from the ideal trigonal bipyramidal value.

What is the hybridization of P in Phosphorus tetrafluoride ion?

The conventional model is sp3d. Phosphorus tetrafluoride ion has 5 electron domains around the central P.

What is the CAS number of Phosphorus tetrafluoride ion?

The CAS number is 14637-70-8. PubChem and NIST identify this with F₄P; use it to locate suppliers and database records.

References

PubChem, Phosphorus tetrafluoride ion. Molecular formula, CAS number, molecular weight and chemical identity.
NIST Chemistry WebBook, SRD 69, Phosphorus tetrafluoride ion. Formula, CAS Registry Number and thermochemical / spectroscopic data.
IUPAC Gold Book. Definitions for "lone pair", "VSEPR", "hybridization" and "formal charge".
Atkins, P. & de Paula, J., Physical Chemistry. VSEPR, molecular geometry and dipole moments.
Guidechem supplier & dictionary records. Commercial sourcing and CAS-linked property pages for Phosphorus tetrafluoride ion (CAS 14637-70-8).

Technical scope: Lewis structures, VSEPR and hybridization are model-based descriptions for chemical communication and structure prediction; actual molecular electronic structure is more accurately represented by molecular-orbital and quantum-chemical methods. Commercial grades vary substantially by supplier and intended use; CAS 14637-70-8 identifies the substance, not a universal purity specification.

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Phosphorus tetrafluoride ion Lewis Structure

Phosphorus tetrafluoride ion Lewis Structure