chemistry

Hexachloroplutonate

Hexachloroplutonate 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 Hexachloroplutonate rather than just read about it. In short: The hexachloroplutonate ion, PuCl2−6, is an ion containing plutonium and chlorine. It forms several salts, which are called hexachloroplutonates.

Key takeaways

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

Reference excerpt

The hexachloroplutonate ion, PuCl2−6, is an ion containing plutonium and chlorine. It forms several salts, which are called hexachloroplutonates.

Structure and bonding The PuCl2−6 ion features a slightly distorted octahedral molecular geometry, with three distinct Pu-Cl bonds. The Pu-Cl bond lengths vary between 2.574 and 2.598 Å, and the Cl-Pu-Cl bond angles range between 88.54° and 91.46°. The Pu-Cl bonds in PuCl2−6 are primarily ionic; however, they feature small but important amounts of covalent bonding. The chloride ligands bond using their s and p electrons, while plutonium bonds using its s, d, and f electrons. The Pu-Cl bond order is less than 1, and the shape of the Pu-Cl bond slightly deviates from cylindrical, possibly indicating a small amount of pi bonding. The 5f electrons in the PuCl2−6 have a large nephelauxetic effect (decrease in electron-electron repulsion).

In aqueous solution It is the dominant species of plutonium(IV) in 11 M hydrochloric acid solution.

Salts The PuCl2−6 ion forms several salts. Dicaesium hexachloroplutonate (Cs2PuCl6) is a pale yellow solid which is precipitated from concentrated HCl solution by the addition of caesium chloride. Cs2PuCl6 can be used to prepare other plutonium compounds, such as the cyclopentadienide complex (η5-C5H5)3PuCl, and it has been proposed for use in the purification of plutonium metal. It has been used as a reference for plutonium(IV), and due to its stability, it has been proposed for use as a primary standard for plutonium. Potassium and rubidium hexachloroplutonates, K2PuCl6 and Rb2PuCl6, are also known. They are prepared by heating mixtures of plutonium(III) chloride and the respective alkali metal chlorides under high chlorine pressures. PuCl2−6 is also known to form salts with quaternary ammonium cations, including tetramethylammonium, tetraethylammonium, and tetrabutylammonium. The tetramethylammonium and tetraethylammonium salts, [NMe4]2[PuCl6] and [NEt4]2[PuCl6], form orange-yellow crystals. [NEt4]2[PuCl6] was used in the first synthesis of plutonocene. The tetrabutylammonium salt, [N(n-Bu)4]2[PuCl6], is prepared by the addition of tetrabutylammonium chloride to plutonium(IV) in HCl aqueous solution. It is soluble in several organic solvents. PuCl2−6 is also known to form salts with pyridinium, pyridinium derivatives, and tetraphenylphosphonium.

References

Illustrations

Worked examples

Example 1 — a first encounter with Hexachloroplutonate

Start with the simplest possible case. Write down what Hexachloroplutonate 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 Hexachloroplutonate 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 Hexachloroplutonate 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 Hexachloroplutonate

In research: Hexachloroplutonate 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 Hexachloroplutonate 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: Hexachloroplutonate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chlorine compounds, Plutonium(IV) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Hexachloroplutonate 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 Hexachloroplutonate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hexachloroplutonate 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.
Explain Hexachloroplutonate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hexachloroplutonate in simple terms?

The hexachloroplutonate ion, PuCl2−6, is an ion containing plutonium and chlorine. It forms several salts, which are called hexachloroplutonates.

Why does Hexachloroplutonate 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 Hexachloroplutonate?

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 Hexachloroplutonate.