chemistry

Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride

Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride rather than just read about it. In short: trans-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). It is a green diamagnetic solid that is soluble in water.

Key takeaways

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

Reference excerpt

trans-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). It is a green diamagnetic solid that is soluble in water. It is the monochloride salt of the cationic coordination complex [CoCl2(en)2]+. One chloride ion in this salt readily undergoes ion exchange but the two other chlorides are less reactive, being bound to the metal center. The more stable cis-dichlorobis(ethylenediamine)cobalt(III) chloride is also known.

Synthesis The compound is synthesized by the reaction of cobalt(II) chloride and ethylenediamine in hydrochloric acid in the presence of oxygen:

4 CoCl2 + 8 en + 4 HCl + O2 → 4 trans-[CoCl2(en)2]Cl + 2 H2O The initial product contains HCl, which is removed by heating. Alternatively, (carbonato)bis(ethylenediamine)cobalt(III) chloride reacts with hydrochloric acid at 10 °C to give the same species.

[Co(CO3)(en)2]Cl + 2 HCl → trans-[CoCl2(en)2]Cl + CO2 + H2O

Related complexes This salt is more soluble than cis-dichlorobis(ethylenediamine)cobalt(III) chloride. This pair of isomers were significant in the development of the area of coordination chemistry. The chiral cis isomer is obtained by heating the trans isomer. Both isomers of dichlorobis(ethylenediamine)cobalt(III) have often been used in stereochemical studies. The trans isomer cation has idealized D2h point group symmetry, whereas the cis isomer cation has C2 symmetry. Tris(ethylenediamine)cobalt(III) chloride in contrast to the bis(ethylenediamine) complexes does not undergo substitution.

References

Illustrations

Worked examples

Example 1 — a first encounter with Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride

Start with the simplest possible case. Write down what Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride

In research: Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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: Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chlorides, Chloro complexes, Cobalt(III) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride in 20 minutes

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Frequently asked questions

What is Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride in simple terms?

trans-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). It is a green diamagnetic solid that is soluble in water.

Why does Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride 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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride?

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 Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride.