chemistry

Gold(I,III) chloride

Gold(I,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 Gold(I,III) chloride rather than just read about it. In short: Gold(I,III) chloride is the inorganic compound with the chemical formula Au4Cl8. It is a mixed valence compound as it contains gold in two oxidation states; square-planar gold(III) and almost linear gold(I).

Key takeaways

Gold(I,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 Gold(I,III) chloride to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gold(I,III) chloride from memory before moving on to harder problems.

Reference excerpt

Gold(I,III) chloride is the inorganic compound with the chemical formula Au4Cl8. It is a mixed valence compound as it contains gold in two oxidation states; square-planar gold(III) and almost linear gold(I). The compound, which is black, is photosensitive as well as air- and moisture-sensitive.

Synthesis According to the procedure by Calderazzo et al., gold(I,III) chloride may be prepared by the reaction of gold(III) chloride with gold carbonyl chloride or carbon monoxide at room temperature in thionyl chloride.

Au2(CO)Cl4 + Au2Cl6 → COCl2 + Au4Cl8 2 Au2Cl6 + 2 CO → Au4Cl8 + 2 COCl2

Structure and properties Single crystals of gold(I,III) chloride are triclinic with a P1 space group and consist of discrete Au4Cl8 molecules with idealised C2h symmetry. Within this the Au(I) centers are linearly coordinated with a Cl-Au-Cl bond angle of 175.0° (close to the ideal value of 180°) and an average bond length of 2.30 Å. The Au(III) centers adopt a slightly irregular square-planar conformation with the Au-Cl bond lengths for bridging chlorides (2.33 Å) being slightly longer than those of terminal chlorides (2.24 Å).

References

Illustrations

Worked examples

Example 1 — a first encounter with Gold(I,III) chloride

Start with the simplest possible case. Write down what Gold(I,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 Gold(I,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 Gold(I,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 Gold(I,III) chloride

In research: Gold(I,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 Gold(I,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: Gold(I,III) chloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chlorides, Eight-membered rings, Gold compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Gold(I,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 Gold(I,III) chloride in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gold(I,III) chloride 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 Gold(I,III) chloride out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gold(I,III) chloride in simple terms?

Why does Gold(I,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 Gold(I,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 Gold(I,III) chloride.