chemistry

Pentaphenylantimony

Pentaphenylantimony 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 Pentaphenylantimony rather than just read about it. In short: Pentaphenylantimony is an organoantimony compound containing five phenyl groups attached to one antimony atom. It has formula Sb(C6H5)5 (or SbPh5).

Key takeaways

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

Reference excerpt

Pentaphenylantimony is an organoantimony compound containing five phenyl groups attached to one antimony atom. It has formula Sb(C6H5)5 (or SbPh5).

Structure The structure of pentaphenylantimony has been the subject of several studies, and a definite ground state remains uncertain. The molecule adopts a roughly square pyramidal shape in the unsolvated crystal. In crystals of the solvate with cyclohexane or tetrahydrofuran, the compound adopts a trigonal bipyramidal shape. When dissolved, molecules are also trigonal bipyramidal. According to solution NMR measurements, the phenyl groups all appear to be equivalent, indicating fluxionality. Solid pure pentaphenylantimony forms triclinic crystals in the P1 space group. The unit cell has a=10.286 b=10.600 and c=13.594 Å, α=79.20° β=70.43° γ=119.52°. The basal Sb-C bond length is 2.216 Å whereas the apex Sb-C length is 2.115 Å.

Reactions Pentaphenylantimony reacts with a variety of protic reagents (hydrogen halides, carboxylic acids, methanol, etc). Benzene is one product as well as a tetraphenylantimony(V) compound:

Ph5Sb + HOR → PhH + Ph4SbOR Ph5Sb + HX → PhH + Ph4SbX Halogens also cleave one Sb-phenyl bond:

Ph5Sb + X2 → Ph4SbX + PhX When heated, pentaphenylantimony forms triphenylstibine, biphenyl and p-quaterphenyl. A reaction with carbon tetrachloride yields tetraphenylstibonium chloride, chlorobenzene, and benzene. Some of these reactions may proceed by radical pathways.

Formation Pentaphenylantimony can be formed by reacting dichlorotriphenylantimony with phenyl lithium.

SbPh3Cl2 + 2 LiPh → SbPh5 + 2 LiCl

References

Further reading Smirnova, N.N.; Letyanina, I.A.; Larina, V.N.; Markin, A.V.; Sharutin, V.V.; Senchurin, V.S. (January 2009). "Thermodynamic properties of pentaphenylantimony Ph5Sb over the range from T→0K to 400K". The Journal of Chemical Thermodynamics. 41 (1): 46–50. doi:10.1016/j.jct.2008.08.002. Brock, C. P.; Ibers, J. A. (1976-01-01). "The role of crystal packing forces in the structure of pentaphenylantimony". Acta Crystallographica Section A. 32 (1): 38–42. Bibcode:1976AcCrA..32...38B. doi:10.1107/S0567739476000065.

Illustrations

Worked examples

Example 1 — a first encounter with Pentaphenylantimony

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

In research: Pentaphenylantimony 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 Pentaphenylantimony 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: Pentaphenylantimony is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hypervalent molecules, Organoantimony compounds, Triclinic crystals, so understanding it makes those chapters shorter.
In everyday life: Look for Pentaphenylantimony 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 Pentaphenylantimony in 20 minutes

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

Frequently asked questions

What is Pentaphenylantimony in simple terms?

Pentaphenylantimony is an organoantimony compound containing five phenyl groups attached to one antimony atom. It has formula Sb(C6H5)5 (or SbPh5).

Why does Pentaphenylantimony 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 Pentaphenylantimony?

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 Pentaphenylantimony.