Why Does IF5 Exhibit a Square Pyramidal Shape Despite Exceeding the Octet Rule?

In summary, the molecular structure of IF5 is trigonal bipyramidal with a central iodine atom bonded to five fluorine atoms in a symmetrical arrangement. It has five bonding electron pairs and one non-bonding electron pair, resulting in a total of six electron pairs around the central iodine atom. The bond angle in IF5 is approximately 90 degrees between the axial fluorine atoms and 120 degrees between the equatorial fluorine atoms. This molecular structure allows IF5 to have high reactivity and strong oxidizing properties, as well as making it a polar molecule with the ability to undergo dipole-dipole interactions. The Lewis structure for IF5 consists of an iodine atom bonded to five fluorine atoms,
  • #1
jolly_math
51
5
Homework Statement
Predict the molecular structure of IF5 and its overall polarity.
Relevant Equations
lewis structure
VSEPR
I thought it was trigonal bipyramidal, with iodine forming 5 bonds with 5 fluorine atoms. Actually, iodine has another lone electron pair, making it square planar.

Is there a reason why iodine has another lone pair when it has already exceeded the octet rule? And how would I predict how many electron pairs a central atom exceeding the octet rule would have? Thank you.
 
Physics news on Phys.org
  • #2
Iodine has 7 valence electrons. The fluorines contribute 1 each. So you have 12 electrons, or 6 pairs to arrange around the I atom.
And IF5 is square pyramidal, not square planar.
 
  • Like
Likes jolly_math

1. What is the molecular formula for IF5?

The molecular formula for IF5 is IF5. This means that the molecule is composed of one atom of iodine and five atoms of fluorine.

2. What is the Lewis structure for IF5?

The Lewis structure for IF5 is a trigonal bipyramidal shape, with the central iodine atom bonded to five fluorine atoms. The lone pairs of electrons on the central atom are represented by two dots above the iodine symbol.

3. What is the bond angle in IF5?

The bond angle in IF5 is 90 degrees between the axial fluorine atoms and 120 degrees between the equatorial fluorine atoms. This is due to the repulsion between the bonded and lone pairs of electrons on the central atom.

4. Is IF5 polar or nonpolar?

IF5 is a polar molecule due to the unequal distribution of electrons between the iodine and fluorine atoms. The fluorine atoms are more electronegative, causing a partial negative charge, while the iodine atom has a partial positive charge.

5. What are the uses of IF5?

IF5 is mainly used as a fluorinating agent in organic synthesis, as it can replace hydrogen atoms with fluorine atoms in molecules. It is also used in the production of other fluorine compounds and in the semiconductor industry as an etching agent.

Similar threads

Chemistry How do we know ##BF_3## has Lewis structure but ##Al_2S_3## does not?
    • Biology and Chemistry Homework Help
Replies
1
Views
620
Chemistry On Molecular Geometry of Hydrazine and Electronegativity
    • Biology and Chemistry Homework Help
Replies
4
Views
6K
What is the Lewis structure of C3H5+ ion?
    • Chemistry
Replies
5
Views
4K
Carbon Monoxide: four resonance structures?
    • Biology and Chemistry Homework Help
Replies
1
Views
5K
In coordinate bond, why doesn't the H^+ atom get a negative charge?
    • Chemistry
Replies
32
Views
3K
Oxidation State & Shapes of Ni(CO)4
    • Biology and Chemistry Homework Help
Replies
1
Views
3K
Why do some Lewis structures have exceptions?
    • Biology and Chemistry Homework Help
Replies
1
Views
2K
Why Does ClNO2 Have Only One Double Bond in Its Lewis Structure?
    • Biology and Chemistry Homework Help
Replies
1
Views
10K
Is Dragos rule evidence of hybridization theory's failure?
    • Chemistry
Replies
9
Views
2K
How many other atoms is the central atom bonded to ?
    • Biology and Chemistry Homework Help
Replies
1
Views
4K

Hot Threads

Recent Insights

Back
Top