science

Pentanitratoaluminate

Pentanitratoaluminate is a science 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 Pentanitratoaluminate rather than just read about it. In short: Pentanitratoaluminate is an anion of aluminium and nitrate groups with formula [Al(NO3)5]2− that can form salts called pentanitratoaluminates. It is unusual being a complex with five nitrate groups, and being a nitrate complex of a light element with nitrate.

Key takeaways

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

Reference excerpt

Pentanitratoaluminate is an anion of aluminium and nitrate groups with formula [Al(NO3)5]2− that can form salts called pentanitratoaluminates. It is unusual being a complex with five nitrate groups, and being a nitrate complex of a light element with nitrate. Such a complex with five nitrate groups is called a pentanitratometallate.

Related complexes There is a pentanitrato complex with cerium (PPh3Et)2[Ce(NO3)5]. Tetranitratoaluminate and hexanitratoaluminate are related anions with aluminium at their core.

Properties There are two different arrangements for the coordination of nitrate with aluminium in the complex. One nitrate is bonded with two oxygens to the aluminium (bidentate), and the other five oxygen atoms only link via one oxygen (monodentate). The bidentate nitrate has an O–Al length of 1.98 Å. Another two Al–O bonds roughly in the same plane have a length of 1.89 Å. The other two Al–O bonds complete a distorted octahedral arrangement and pop out the top and bottom of the aluminium with a length of 1.93 Å. The bidentate connected nitrate group is distorted so that the uncoordinated terminal oxygen bond is shorter than the coordinated oxygen–nitrogen distance (1.22 versus 1.31 Å). The angles are also warped, with coordinated oxygen angle subtended on the nitrogen of 109°, and angle of these oxygen atoms with the terminal atom of 126°. The whole nitrate is still planar along with the aluminium.

Examples An example salt is caesium pentanitratoaluminate Cs2[Al(NO3)5]. caesium pentanitratoaluminate crystallises in the trigonal form with α = 11.16 Å, c = 10.02 Å, formula mass 602.85, with three molecules per unit cell. The unit cell volume is 1080 Å3, measured density 2.69 g/cm3. The space group is P3121. It is a crystalline substance. Caesium pentanitratoaluminate has been formed by treating a mixture of caesium chloride and caesium tetrachloroaluminate with dinitrogen tetroxide and methyl nitrate, and pumping off the NOCl gas produced. If only caesium tetracloroaluminate is used, omitting the CsCl, then the result contains solid Al(NO3)3·CH3CN as well. Tetramethylammonium pentanitratoaluminate has been made by recrystallising tetramethyl ammonium tetranitratoaluminate in acetonitrile over several weeks. It forms a waxy substance.

References

Worked examples

Example 1 — a first encounter with Pentanitratoaluminate

Start with the simplest possible case. Write down what Pentanitratoaluminate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Pentanitratoaluminate 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 Pentanitratoaluminate 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 Pentanitratoaluminate

In research: Pentanitratoaluminate appears in science 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 Pentanitratoaluminate 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: Pentanitratoaluminate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aluminium complexes, Anions, Nitrates, so understanding it makes those chapters shorter.
In everyday life: Look for Pentanitratoaluminate 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 Pentanitratoaluminate in 20 minutes

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

Frequently asked questions

What is Pentanitratoaluminate in simple terms?

Why does Pentanitratoaluminate matter?

Because it connects several science 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 Pentanitratoaluminate?

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 Pentanitratoaluminate.