chemistry

Pentamethylcyclopentadienyl iridium dichloride dimer

Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer rather than just read about it. In short: Pentamethylcyclopentadienyl iridium dichloride dimer is an organometallic compound with the formula [(C5(CH3)5IrCl2)]2, commonly abbreviated [Cp*IrCl2]2 This bright orange air-stable diamagnetic solid is a reagent in organometallic chemistry. Structure The compound has C2h symmetry.

Key takeaways

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

Reference excerpt

Pentamethylcyclopentadienyl iridium dichloride dimer is an organometallic compound with the formula [(C5(CH3)5IrCl2)]2, commonly abbreviated [Cp*IrCl2]2 This bright orange air-stable diamagnetic solid is a reagent in organometallic chemistry.

Structure The compound has C2h symmetry. Each metal is pseudo-octahedral. The terminal and bridging Ir-Cl bonds have the lengths 2.39 and 2.45 Å, respectively.

Preparation, reactions Pentamethylcyclopentadienyl iridium dichloride dimer was first prepared by the reaction of hydrated iridium trichloride with hexamethyl Dewar benzene. More conveniently, the compound is prepared by the reaction of hydrated iridium trichloride and pentamethylcyclopentadiene in hot methanol, from which the product precipitates

2 Cp*H + 2 IrCl3(H2O)3 → [Cp*IrCl2]2 + 2 HCl + 6 H2O The Ir-μ-Cl bonds are labile and can be cleaved to give a variety of adducts of the general formula Cp*IrCl2L. Such adducts undergo further substitution to afford cations [Cp*IrClL2]+ and [Cp*IrL3]2+. The chloride ligands can also be replaced by other anions such as carboxylates, nitrite, and azide. Reduction of [Cp*IrCl2]2 in the presence of CO affords [Cp*Ir(CO)2], which can be decarbonylated to give the unsaturated derivative [Cp*Ir(CO)]2. Treatment of [Cp*IrCl2]2 with borohydride under an atmosphere of H2 gives the iridium(V) derivative Cp*IrH4. [Cp*IrCl2]2 is a precursor to catalysts for the asymmetric transfer hydrogenation of ketones.

Related compounds The 16e monomer (tBu3C5H2)IrCl2 Pentamethylcyclopentadienyl rhodium dichloride dimer

References

Illustrations

Worked examples

Example 1 — a first encounter with Pentamethylcyclopentadienyl iridium dichloride dimer

Start with the simplest possible case. Write down what Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer

In research: Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer 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: Pentamethylcyclopentadienyl iridium dichloride dimer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chloro complexes, Dimers (chemistry), Metallocenes, so understanding it makes those chapters shorter.
In everyday life: Look for Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer in 20 minutes

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Frequently asked questions

What is Pentamethylcyclopentadienyl iridium dichloride dimer in simple terms?

Why does Pentamethylcyclopentadienyl iridium dichloride dimer 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 Pentamethylcyclopentadienyl iridium dichloride dimer?

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 Pentamethylcyclopentadienyl iridium dichloride dimer.