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Transition metal thiocarbonyl complex

Transition metal thiocarbonyl complex 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 thiocarbonyl complex rather than just read about it. In short: A transition metal thiocarbonyl complex is a coordination compound containing the ligand CS. Whereas metal carbonyl complexes are very common, even industrially important, only a few dozen thiocarbonyl complexes are known.

Transition metal thiocarbonyl complex — main illustration
Transition metal thiocarbonyl complex — illustration

Key takeaways

  • Transition metal thiocarbonyl complex 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 thiocarbonyl complex to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Transition metal thiocarbonyl complex from memory before moving on to harder problems.

Reference excerpt

A transition metal thiocarbonyl complex is a coordination compound containing the ligand CS. Whereas metal carbonyl complexes are very common, even industrially important, only a few dozen thiocarbonyl complexes are known.

Preparation

The main challenge for the preparation of thiocarbonyl complexes is the unavailability of carbon monosulfide. Thus, the CS ligand is often extruded from thiocarbonyl-containing precursors. One reagent is thiophosgene, which reacts with disodium tetracarbonylferrate:

Na2Fe(CO)4 + CSCl2 → Fe(CO)4CS + 2 NaCl Instead of thiophosgene, chlorothioformates (ClC(S)OAr) have also been used as a source of CS ligands. The thiocarbonyl analogue of Vaska's complex is prepared in this way. Carbon disulfide is another source of thiocarbonyl ligands, although CS2 is less electrophilic than thiophosgene and its alkoxy derivative. Carbon disulfide forms η2-CS2 complexes (see transition metal complexes of carbon disulfide), which are susceptible to desulfurization. This pattern is illustrated by the reaction of Wilkinson's catalyst (RhCl(PPh3)3):

RhCl(PPh3)3 + CS2 → RhCl(CS2)(PPh3)3 RhCl(CS2)(PPh3)3 → RhCl(CS)(PPh3)2 + SPPh3 This conversion gave rise to the very first thiocarbonyl complex. The reaction of (C5H5)2Ni2(CO)2 with carbon disulfide gives ca 30% yield of (C5H5)3Ni3(CS)2, a trimetallic cluster with two triply bridging thiocarbonyl ligands. Many other thiocarbonyl complexes arise from similarly complicated reactions in modest yield, including addition of sulfur reagents to metal carbyne complexes.

Structure and bonding According to the Covalent bond classification method, terminal CS is classified as an L ligand, i.e., a charge-neutral Lewis base. With respect to HSAB theory, it is classified as soft. According to spectroscopic measurements, CS is a superior pi-acceptor relative to CO, as indicated by the shortness of M-CS vs M-CO bonds.

Selenocarbonyl and tellurocarbonyl complexes Several complexes of CSe and CTe have been characterized. The first examples were prepared from the osmium dichlorocarbene complex.

OsCl2(CCl2)(PPh3)2(CO) + 2 EH− → OsCl2(CE)(PPh3)2(CO) + 2 Cl− + H2E (E = Se, Te; Ph = C6H5)

References

Illustrations

Transition metal thiocarbonyl complex: Structure of Cr(CS)(CO)4(P(C6H5)3). Color code: yellow = S, orange = P, red = O. Selected distances: C-S = 154, C-O = 113, Cr-CS = 179, Cr-CO = 190 picometers[1]
Structure of Cr(CS)(CO)4(P(C6H5)3). Color code: yellow = S, orange = P, red = O. Selected distances: C-S = 154, C-O = 113, Cr-CS = 179, Cr-CO = 190 picometers[1]
Transition metal thiocarbonyl complex: Structure of (C5H5)2Co2(μ-CS)2(P(CH3)3). Selected bond distances: C-S, 159; SC-Co(P), 195; SC-Co, 180; Co-Co, 239 picometers.[3]
Structure of (C5H5)2Co2(μ-CS)2(P(CH3)3). Selected bond distances: C-S, 159; SC-Co(P), 195; SC-Co, 180; Co-Co, 239 picometers.[3]

Worked examples

Example 1 — a first encounter with Transition metal thiocarbonyl complex

Start with the simplest possible case. Write down what Transition metal thiocarbonyl complex 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 thiocarbonyl complex 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 thiocarbonyl complex 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 thiocarbonyl complex

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

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Transition metal thiocarbonyl complex means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Transition metal thiocarbonyl complex out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Transition metal thiocarbonyl complex in simple terms?

A transition metal thiocarbonyl complex is a coordination compound containing the ligand CS. Whereas metal carbonyl complexes are very common, even industrially important, only a few dozen thiocarbonyl complexes are known.

Why does Transition metal thiocarbonyl complex 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 thiocarbonyl complex?

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 thiocarbonyl complex.

Tags

  • Coordination complexes

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