chemistry

Triethylmethylammonium trichloride

Triethylmethylammonium trichloride is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Triethylmethylammonium trichloride rather than just read about it. In short: Triethylmethylammonium trichloride [NEt3Me][Cl3] is an ionic liquid consisting of an asymmetric triethylmethylammonium cation and a trichloride anion. The trichloride is also known as trichlorine monoanion representing one of the simplest polychlorine anions.

Key takeaways

Triethylmethylammonium trichloride belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Triethylmethylammonium trichloride to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Triethylmethylammonium trichloride from memory before moving on to harder problems.

Reference excerpt

Triethylmethylammonium trichloride [NEt3Me][Cl3] is an ionic liquid consisting of an asymmetric triethylmethylammonium cation and a trichloride anion. The trichloride is also known as trichlorine monoanion representing one of the simplest polychlorine anions.

Preparation Triethylmethylammonium trichloride is prepared by the reaction of triethylmethylammonium chloride and elemental chlorine gas. [NEt3Me]Cl + Cl2 → [NEt3Me][Cl3]

Structure and chemical bonding According to the halogen bonding concept, the trichloride anion can be described as a donor-acceptor complex consisting of a chloride anion (the halogen donor) and a dichlorine molecule (the halogen acceptor). By donation of electron density of the chloride anion into the σ-hole of the dichlorine molecule lying along the Cl-Cl bonding axis. In this way, the trichloride anion ([Cl-Cl-Cl]−) is formed which theoretically adopts a linear geometry with Cl-Cl bonds of equal length. However, the real structure of the trichloride anion is typically slightly different due to interaction of the trichloride anion with cations or anisotropic effects in the solid state. A more precise definition of triethylmethylammonium trichloride is given by the sum formula [NEt3Me][Cl(Cl2)n] where n is the number of equivalents of dichlorine that are bonded. By addition of elemental chlorine to [NEt3Me]Cl (n = 0), the value of n increases continuously forming the trichloride [NEt3Me][Cl3] (n = 1), the pentachloride [NEt3Me][Cl5] (n = 2) and, at higher chlorine loadings, higher polychlorides. For values of n < 0.8, [NEt3Me][Cl(Cl2)n] is a yellow solid, while for n > 0.8 [NEt3Me][Cl(Cl2)n] exists as an ionic liquid at room temperature.

Applications Triethylmethylammonium trichloride [NEt3Me][Cl3] shows a similar reactivity like tetraethylammonium trichloride or elemental chlorine but is easier to handle than chlorine gas as it is a liquid at room temperature. For instance, alkenes are chlorinated with triethylmethylammonium trichloride providing the corresponding vicinal 1,2-dichloroalkanes. Recently, the reaction of triethylmethylammonium trichloride with carbon monoxide to form phosgene was described. In this reaction, carbon monoxide is oxidized at room temperature. Alternatively, the reaction can be performed utilizing catalytical amounts of [NEt3Me]Cl in the presence of elemental chlorine forming presumably the catalytically active species [NEt3Me][Cl3] which reacts with carbon monoxide yielding phosgene and forming [NEt3Me]Cl. [NEt3Me][Cl3] + CO → COCl2 + [NEt3Me]Cl

References

Illustrations

Worked examples

Example 1 — a first encounter with Triethylmethylammonium trichloride

Start with the simplest possible case. Write down what Triethylmethylammonium trichloride claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Triethylmethylammonium trichloride before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Triethylmethylammonium trichloride ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Triethylmethylammonium trichloride

In research: Triethylmethylammonium trichloride appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Triethylmethylammonium trichloride in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Triethylmethylammonium trichloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chlorine compounds, Ethyl compounds, Methyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Triethylmethylammonium trichloride outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Triethylmethylammonium trichloride in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Triethylmethylammonium trichloride means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Triethylmethylammonium trichloride in simple terms?

Why does Triethylmethylammonium trichloride matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Triethylmethylammonium trichloride?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Triethylmethylammonium trichloride.