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Transition metal complexes of phosphine oxides

Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides rather than just read about it. In short: Transition metal complexes of phosphine oxides are coordination complex containing one or more phosphine oxide ligands. Many phosphine oxides exist and most behave as hard Lewis bases.

Key takeaways

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

Reference excerpt

Transition metal complexes of phosphine oxides are coordination complex containing one or more phosphine oxide ligands. Many phosphine oxides exist and most behave as hard Lewis bases. Tertiary phosphine oxides bind metals by formation of M-O bonds.

Structure

The structure of a tertiary phosphine oxide is not strongly perturbed by coordination. The geometry at phosphorus remains tetrahedral. The P-O distance elongates by ca. 2%. In triphenylphosphine oxide, the P-O distance is 1.48 Å. In NiCl2[OP(C6H5)3]2, the distance is 1.51 Å (see figure). A similar elongation of the P-O bond is seen in cis-WCl4(OPPh3)2. The trend is consistent with the stabilization of the ionic resonance structure upon complexation.

Examples Typically, complexes are derived from hard metal centers. Examples include cis-WCl4(OPPh3)2 and NbOCl3(OPPh3)2 Trialkylphosphine oxides are more basic (better ligands) than triarylphosphine oxides. One such complex is FeCl2(OPMe3)2 (Me = CH3).

Synthesis and reactions Most complexes of phosphine oxides are prepared by treatment of a labile metal complex with preformed phosphine oxide. In some cases, the phosphine oxide is unintentionally generated by air-oxidation of the parent phosphine ligand. Since phosphine oxides are weak Lewis bases, they are readily displaced from their metal complexes. This behavior has led to investigation of mixed phosphine-phosphine oxide ligands, which exhibit hemilability. Typical phosphine-phosphine oxide ligands are Ph2P(CH2)nP(O)Ph2 (Ph = C6H5) derived from bis(diphenylphosphino)ethane (n = 2) and bis(diphenylphosphino)methane (n = 1). In one case, coordination of the oxide of dppe to W(0) results in deoxygenation, giving an oxotungsten complex of dppe.

Secondary phosphine oxides as ligands

Secondary phosphine oxides have the formula R2P(O)H. They tautomerize to small amounts of the hydroxy tautomer R2P-OH. Regardless, the hydroxy tautomer forms a wide variety of complexes with transition metals. In contrast to O-bonded phosphine oxide ligands, the P-bonded phosphine oxides are strong field ligands. Complexes of secondary phosphine oxide often engage in intramolecular hydrogen bonds. Illustrative is the complex derived from dimethylphosphine oxide, PtH(PMe2OH)2(PMe2O) (Me = CH3). Itramolecular hydrogen bonding also features prominently in some complexes of phosphorous acid. The complex platinum pop, formally derived from P(OH)3, is one example. The Kläui ligand is the anion {(C5H5)Co[(CH3O)2PO]3}−, which is derived by demethylation of a trimethylphosphite complex. In this case the "ligand" is a complex of cobalt that also binds to other metals in a tridentate manner.

References

Illustrations

Worked examples

Example 1 — a first encounter with Transition metal complexes of phosphine oxides

Start with the simplest possible case. Write down what Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides

In research: Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides 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: Transition metal complexes of phosphine oxides is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coordination complexes, Ligands, Phosphine oxides, so understanding it makes those chapters shorter.
In everyday life: Look for Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides in 20 minutes

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Frequently asked questions

What is Transition metal complexes of phosphine oxides in simple terms?

Transition metal complexes of phosphine oxides are coordination complex containing one or more phosphine oxide ligands. Many phosphine oxides exist and most behave as hard Lewis bases.

Why does Transition metal complexes of phosphine oxides 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 Transition metal complexes of phosphine oxides?

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 Transition metal complexes of phosphine oxides.