chemistry

Monolayer-protected cluster molecules

Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules rather than just read about it. In short: Monolayer protected clusters (MPCs) are one type of nanoparticles or clusters of atoms. A single MPC contains three main parts: metallic core, protective ligand layer and metal-ligand interface between, each defined by their distinctive chemical and structural environments.

Key takeaways

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

Reference excerpt

Monolayer protected clusters (MPCs) are one type of nanoparticles or clusters of atoms. A single MPC contains three main parts: metallic core, protective ligand layer and metal-ligand interface between, each defined by their distinctive chemical and structural environments. The main part of a MPC is a metallic core, which can consist of a single metal or it can be a mixture of metals. Bare metal particles tend to be reactive. They usually react with environment or with other particles making larger structures. Ligand layer is used to protect them, so that the particle size is preserved. Ligands are usually some organic molecules and they are bound to metallic core via some linking atoms such as sulfur or phosphorus forming thiol and phosphine ligands. However, there are alkynyl and carbene protected MPCs, where carbon is directly bound to metal atoms. Ligand layer can consist of a single type of ligands, like in the case of thiolate-protected gold clusters, or it can contain several different molecules. Even though the ligand layer is usually used to passivate a nanoparticle, it is not a passive part of the MPCs. For example, ligands can be functionalized to work in specific applications such as binding to surfaces or acting as a carrier for other molecules. Ligand layer also contributes to the total electronic structure of the particle, which furthermore affects the superatomic nature of the particle.

In order to fully understand how MPCs work, one has to solve their atomic structures. One of the most common ways is to use X-ray crystallography. There are a large amount of these structures found but they are scattered over different sources. This article is designed to be a list of known structures of MPCs focusing on experimentally determined ones. MPCs are divided to tables according to their cores. Within the tables they are sorted according to the amount of metal atoms from smallest to largest. If there several clusters with similar core sizes, earlier published is listed first. The last table contains some structures which are partially determined experimentally and partially predicted by theoretical calculations. Every table lists the chemical formula of the MPC, the full reference to the publication and a their shortened DOI code with a link to the publication. There are three main ways to access the structure information. The first one is to go to the webpage of the original publication and see if there is supplementary information file containing the data. The second approach is to use the listed DOI and search the structure from the Cambridge Structural Database (CSD) or Crystallography Open Database (COD). There one can easily download the structure, if authors have submitted their crystallographic data. Some crystal structures are published in Protein Data Bank (PDB), in which case corresponding accession code is listed after the DOI. The third option is for the situations, where two first ones don't work and the data is really needed. One can check who is the corresponding author of the publication and ask politely for the data.

Gold

Silver

Copper

Aluminium

Gallium

Germanium

Palladium

Mixed metal

Partially experimentally determined

References

External links Pihlajamäki, Antti; Malola, Sami; Häkkinen, Hannu (24 May 2024). "Creating a Catalog of the Crystal Structures of Monolayer-Protected Clusters". ChemRxiv. doi:10.26434/chemrxiv-2024-kxjpb. this work

Illustrations

Worked examples

Example 1 — a first encounter with Monolayer-protected cluster molecules

Start with the simplest possible case. Write down what Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules

In research: Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules 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: Monolayer-protected cluster molecules is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cluster chemistry, so understanding it makes those chapters shorter.
In everyday life: Look for Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules in 20 minutes

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Frequently asked questions

What is Monolayer-protected cluster molecules in simple terms?

Why does Monolayer-protected cluster molecules 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 Monolayer-protected cluster molecules?

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 Monolayer-protected cluster molecules.