physics

Stannide

Stannide is a physics 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 Stannide rather than just read about it. In short: A stannide can refer to an intermetallic compound containing tin combined with one or more other metals; an anion consisting solely of tin atoms or a compound containing such an anion, or, in the field of organometallic chemistry an ionic compound containing an organotin anion. An alternative name for such a compound is stannanide.

Key takeaways

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

Reference excerpt

A stannide can refer to an intermetallic compound containing tin combined with one or more other metals; an anion consisting solely of tin atoms or a compound containing such an anion, or, in the field of organometallic chemistry an ionic compound containing an organotin anion. An alternative name for such a compound is stannanide.

Binary alkali and alkaline earth stannides When tin is combined with an alkali or alkaline earth metal some of the compounds formed have ionic structures containing monatomic or polyatomic tin anions (Zintl ions), such as Sn4− in Mg2Sn or Sn4−9 in K4Sn9. Even with these metals not all of the compounds formed can be considered to be ionic with localised bonding, for example Sr3Sn5, a metallic compound, contains {Sn5} square pyramidal units.

Ternary alkali and alkaline earth stannides Ternary (where there is an alkali or alkaline earth metal, a transition metal as well as tin, for example LiRh3Sn5 and MgRuSn4) have been investigated.

Other metal stannides Binary (involving one other metal) and ternary (involving two other metals) intermetallic stannides have been investigated. Niobium stannide, Nb3Sn is perhaps the best known superconducting tin intermetallics. This is more commonly called "niobium–tin". There are multiple rare earth stannides, including with dysprosium and yttrium.

Stannide ions, Sny−x Some examples of stannide Zintl ions are listed below. Some of them contain 2-centre 2-electron bonds (2c-2e), others are "electron deficient" and bonding sometimes can be described using polyhedral skeletal electron pair theory (Wade's rules) where the number of valence electrons contributed by each tin atom is considered to be 2 (the s electrons do not contribute). There are some examples of silicide and plumbide ions with similar structures, for example tetrahedral Si4−4, the chain anion (Si2−)n, Pb4−4 and Pb4−9.

Sn4− found for example in Mg2Sn. Sn4−4, tetrahedral with 2c-2e bonds e.g. in CsSn. Sn2−4, tetrahedral closo-cluster with 10 electrons (2n + 2). (Sn2−)n zigzag chain polymeric anion with 2c-2e bonds found for example in BaSn. Sn2−5 closo-cluster, 12 electrons (2n + 2), (i.e. trigonal bipyramidal) in (2,2,2-crypt-Na)2Sn5. (Sn4−8)n polymeric two-dimensional anion in NaSn2. Sn4−9 nido-cluster 22 electrons (2n + 4), capped square antiprismatic with as per polyhedral skeletal electron pair theory, in the intermetallic K4Sn9, and a distorted ion in the salt Na4Sn9·7 en. Sn3−9 a paramagnetic, 21 electrons, closo- cluster anion (D3h symmetry), 1 more electron than the 20 (2n + 2) predicted by polyhedral skeletal electron pair theory. (Sn7−12)n polymeric two-dimensional anion in Na7Sn12

References

Worked examples

Example 1 — a first encounter with Stannide

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

In research: Stannide appears in physics 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 Stannide 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: Stannide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anions, Cluster chemistry, Homonuclear ions, so understanding it makes those chapters shorter.
In everyday life: Look for Stannide 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 Stannide in 20 minutes

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

Frequently asked questions

What is Stannide in simple terms?

Why does Stannide matter?

Because it connects several physics 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 Stannide?

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 Stannide.