Is CF4 a Polar or Nonpolar Compound?

The simplest fluorocarbon, carbon tetrafluoride, or tetrafluoromethane, has an extremely high binding strength. It is a colourless, non-flammable gaseous chemical that belongs to the haloalkane family (a combination of halogen and alkane). Tetrafluoromethane is a helpful refrigerant, but it also contributes to greenhouse gas emissions.

Is CF4 polar or non-polar, then? The molecule CF4 is a nonpolar one. Although all C-F bonds are polar because to the electronegativity differences between carbon and fluorine, the CF4 molecule as a whole is non-polar. The symmetrical arrangement of all fluorine atoms around the core carbon atom accounts for this. As a result, each individual C-F bond dipole cancels out, resulting in the entire molecule having a net-zero dipole moment, making it nonpolar.

Structure and Molecular Geometry of CF4

Carbon tetrafluoride has a tetrahedral molecular structure, with the carbon atom at the centre and four fluorine atoms around it. The CF 4 molecule, on the other hand, is organised in two planes.

Two of the C-F bonds are parallel to the paper’s plane, but the other two are not. In the chemical structure of CF 4, there are no lone pairs, and the goal is to reduce the distance between the Carbon and Fluorine.

The length of the carbon-fluorine bond is usually around 1.32 Angstrom. With sp3 hybridization, the bond angle for each C-F bond is 109°28′. (for the carbon atom).

There are 32 valence electrons in the Lewis dot structure of CF4, with 7 electrons around each fluorine atom (744 = 28) and 4 electrons around the core carbon atom.

Because each fluorine atom shares one electron with the carbon atom, all octets are filled by electron sharing (both Fluorine and Carbon).

Nonetheless, because Fluorine is substantially more electronegative than Carbon (electronegativity of Fluorine = 3.98, whereas Carbon’s is 2.55), the sharing of electrons is not equal.

The molecule of CF4 has a tetrahedral molecular structure due to the absence of a lone pair on the central atom (according to the VSEPR Theory).

I’ve published a full article on CF4 Lewis Structure, Hybridization, and Geometry for your reference.

Non-Polar Compound Characteristics

The accumulated existence of a non-zero dipole moment in the molecular structure determines a compound’s polarity.

Molecules with dipole-dipole interactions have a net non-zero dipole moment, whereas those without such interactions have a dipole moment of zero Debye.

A number of characteristics distinguish non-polar molecules.

1.) Symmetry: Even if individual bonds exhibit dipole forces, molecules with symmetry in their architectures likely to have a net-zero dipole moment (between two atoms).

Individual dipoles in symmetric molecules normally produce results that are equal in magnitude and opposite in direction.

They cancel each other out (vector sum = 0) and hence eliminate the net dipole moment on these grounds.

CBr4 is one such chemical, with all C-Br bonds arranged symmetrically. The reason for CBr4’s non-polarity can be found in this article.

2.) Bonding: Hydrogen and covalent bonds are stronger than Vander Waal forces of attraction, which are weak.

Compounds with lower forces to link their molecular structures together are more likely to be non-polar.

The reason for this is straightforward. The Vander Waal forces are weak enough to be quickly disrupted, and they don’t lead to any major charge accumulation near the poles.

Stronger bonds, on the other hand, exhibit attractive and repulsive forces, resulting in partial charge imbalances.

3.) Charge Accumulation: Non-polar molecules have an equal distribution of electrons that form a link. No partial charges are distributed on the atoms involved in bond formation in this scenario.

The charges do not accumulate or amass on either pole of the molecule since there is no push or pull on the electrons.

As a result, non-polar molecules do not accumulate charge.

4.) Difference in Electronegativity: For a dipole moment to be deemed significant, the electronegativity difference between the two atoms making the bond must be more than 0.4.

The dipole moment created is insufficient for electronegative differences below 0.4. The dipole-dipole interactions are not affected by such small differences.

Compounds with a dipole moment of 0.6 D, such as NCl3, are considered somewhat polar. There are several exceptions in chemistry. The reason for NCl3’s polarity is explained in the article.

Individual bonds in a molecule could be polar (owing to electronegativity differences), but the sum of all bonds could balance out.

5.) Properties: Because weaker forces need less energy to modify, non-polar substances have low melting and boiling points.

What makes CF4 a nonpolar substance?

The C-F Bond’s Dipole Moment

Each bond in CF4 has its own unique dipole moment.

Because of the significant difference in electronegativity between carbon and fluorine, the fluorine atoms tend to pull the shared electron pair between C and F towards themselves, forming an uneven charge distribution and a dipole moment (with fluorine having a somewhat negative charge build-up and carbon left with a partial positive charge).

What role does structure play in CF4 polarity?

Two C-F bonds in CF4 are in the same plane as the other two, but the other two are not. The resultant of the two bonds, on the other hand, appears to be in the same plane as the two in-plane bonds.

The resultant dipole of the other two C-F bonds, on the other hand, originates at a perfect 180° angle from the resultant of the same plane bond pairs, cancelling both opposite dipoles.

The cancellation of the dipole moments is the fundamental explanation for non-polarity in CF4, despite the fact that the individual bonds are quite polar.

The structural shape of the compound’s molecule causes this call-off.

As a result, the molecule has no dipole-dipole interactions.

What is the process for making CF4?

Tetrafluoromethane is produced in a variety of ways.

1.) The production of CF4 is caused by the interaction of graphite carbon with fluorine (Fluorination of Carbon).

2F2 (graphite) + C (graphite) ———> CF4 (g)

2.) A reaction of CCl2F2 or CCl3F with Hydrogen Fluoride can also produce it (HF, in gaseous phase).

CCl2F2 + 2HF (g) ––––––––––––––––––––––––––––––––––––––––––

CF4 + 3HCl = CCl3F + 3HF (g)

3.) It is a by-product of the aluminium manufacturing process.

CF4’s properties

The molecular weight of this compound is 88 g/mol.

132.3 pm is the length of the bond.

Angle of bond = 109°28′

-50.2°C is the critical temperature.

3.72 g/L density

Debye’s net dipole moment = 0

Solubility = soluble in non-polar solvents such as benzene and chloroform, but only about 20 mg/L in water.

-183.8°C melting point

-128°C is the boiling point.

The non-polar structure of the compound accounts for its low melting and boiling points. Non-polar substances have lesser attraction forces and can be agitated with very little heat.

Colorless, odourless, non-flammable, and non-explosive, carbon tetrafluoride is a gas.

When inhaled, it has a moderately harmful effect on the human body.

CF4’s Applications

As a low-temperature refrigerant, CF4 is particularly common.

It is both an oxygen displacer and an inert gas (under standard environment conditions).

CF4 is utilised in a variety of water etching techniques.

It has a variety of applications in neutron detectors.

It’s employed in the microfabrication of electronics (either alone or in combination with combination).

Tetrafluoromethane’s potential greenhouse gas impacts

Tetrafluoromethane (CF4) is a colourless, non-flammable gas with an extremely high stability. It absorbs infrared radiation with a wavelength of 8 micrometres and hence has the ability to influence the greenhouse effect.

The gas has a 50,000-year lifespan in the atmosphere.

It’s known as PFC-14 (perfluorocarbon-14), and it’s the most prevalent PFC in the atmosphere, with a steady increase in concentration due to its widespread usage as a refrigerant.

Because it lacks chlorine atoms, CF4 is structurally similar to CFCs (chlorofluorocarbons), yet it does not contribute to ozone layer depletion.

When chlorine atoms react with UV radiation in CFCs, they break down, resulting in O3 exhaustion.

However, because chlorine is missing in CF4, no such reactions occur, which could decrease the stratospheric ozone layer.

Because C-F bonds are more stable and less prone to dissociate, it is the most persistent greenhouse gas. It also contributes to the long-term repercussions of global warming.

Read more: Molecular Geometry, Hybridization, and the MO Diagram for XeF2.

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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