Nitrile
Definition and meaning of Nitrile in chemistry.
A nitrile is an organic compound characterized by a functional group containing a carbon atom triple-bonded to a nitrogen atom (-C≡N). These compounds are highly polar and are frequently used to manufacture specialized polymers and industrial chemicals.
In more detail
The nitrile functional group, often referred to as a cyano group, is a distinct chemical structure defined by a remarkably strong carbon-nitrogen triple bond. Because nitrogen is significantly more electronegative than carbon, it strongly pulls the electrons in the triple bond toward itself. This unequal sharing of electrons creates a massive dipole moment, making the entire functional group highly polar.
Due to this extreme polarity, these compounds generally have very high boiling points compared to other organic molecules of a similar physical size. They also tend to be excellent solvents for a wide variety of both organic and inorganic chemical reactions. The carbon-nitrogen triple bond is one of the strongest bonds in organic chemistry, making these molecules quite stable under normal conditions.
However, under specific laboratory conditions, the polarized carbon atom becomes a prime target for chemical attack. If boiled in a strong acidic or basic water solution, the triple bond undergoes hydrolysis. The water molecules systematically break the triple bond, eventually converting the entire functional group into a carboxylic acid.
Additionally, chemists can use powerful reducing agents to add hydrogen atoms across the triple bond, cleanly converting the molecule into a primary amine. In the industrial manufacturing sector, these compounds are incredibly valuable. The most commercially important example is acrylonitrile, a simple molecule containing a double bond adjacent to the cyano group.
When thousands of these molecules are chemically linked together through polymerization, they form polyacrylonitrile. This durable synthetic polymer is spun into fibers to create acrylic yarn used in clothing, blankets, and carpets. Furthermore, specific liquid nitriles are manufactured in massive quantities to serve as specialized extraction solvents in the petrochemical industry.
Key facts
| Field | Organic Chemistry |
|---|---|
| Structure | Carbon triple-bonded to a nitrogen atom (-C≡N) |
| Chemical Property | Highly polar due to the electronegative nitrogen |
| Key Reactions | Can be hydrolyzed into carboxylic acids or reduced into amines |
| Industrial Uses | Solvents, superglue (cyanoacrylate), and acrylic synthetic fibers |
| Toxicity | While related to cyanide salts, most organic nitriles are much less toxic |
Acetonitrile is a simple, highly polar liquid that chemists frequently use as a solvent to dissolve complex organic compounds during laboratory analyses.
Frequently asked questions
What is the difference between a nitrile and a cyanide?
In organic chemistry, the term nitrile is used when the -C≡N group is covalently bonded to a carbon chain. The term cyanide usually refers to the highly toxic inorganic salts containing the free CN- ion.
Why do they have high boiling points?
Their strong polarity creates significant intermolecular forces, requiring a large amount of heat energy to force the molecules apart into a gas.
Can the triple bond be broken?
Yes, despite being very strong, it can be fully broken down into a carboxylic acid by boiling it in strong acid or base.