chemistry

HKUST-1

HKUST-1 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 HKUST-1 rather than just read about it. In short: HKUST-1, also known as MOF-199, is a material in the class of metal-organic frameworks (MOFs). It is named after the Hong Kong University of Science and Technology.

Key takeaways

HKUST-1 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HKUST-1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HKUST-1 from memory before moving on to harder problems.

Reference excerpt

HKUST-1, also known as MOF-199, is a material in the class of metal-organic frameworks (MOFs). It is named after the Hong Kong University of Science and Technology. Metal-organic frameworks are crystalline materials, in which metals are linked by ligands (linker molecules) to form repeating coordination motives extending in three dimensions. The HKUST-1 framework is built up of dimeric metal units, which are connected by benzene-1,3,5-tricarboxylate linker molecules. The paddlewheel unit is the commonly used structural motif to describe the coordination environment of the metal centers and also called secondary building unit (SBU) of the HKUST-1 structure. The paddlewheel is built up of four benzene-1,3,5-tricarboxylate linkers molecules, which bridge two metal centers. One water molecules is coordinated to each of the two metal centers at the axial position of the paddlewheel unit in the hydrated state, which is usually found if the material is handled in air. After an activation process (heating, vacuum), these water molecules can be removed (dehydrated state) and the coordination site at the metal atoms is left unoccupied. This unoccupied coordination site is called coordinatively unsaturated site (CUS) and can be accessed by other molecules.

Structural analogs

Monometallic HKUST-1 analogs Cu2+ was used as metal center in the first synthesized HKUST-1 material, but the HKUST-1 structure was also obtained with other metals. The oxidation state of most used metals is +2, which results in a neutral overall framework. In the case of trivalent metals (oxidation state +3), the overall framework is positively charged and requires anions to compensate the charge and guarantee charge neutrality.

Mixed-metal HKUST-1 analogs In addition to monometallic HKUST-1 analogs, several mixed-metal HKUST-1 materials were synthesized, in which two metals are incorporated into the framework structure at crystallographically equivalent positions. The incorporation of two metals can be achieved by using both metals for the synthesis (direct synthesis) or by using post-synthetic metal-exchange. For the post-synthetic metal exchange, a monometallic HKUST-1 material is synthesized in the first step. Subsequently, this monometallic HKUST-1 is suspended in a solution containing the second metal, which results in an exchange of metal centers in the framework leading to a mixed-metal HKUST-1.

Theoretically calculated HKUST-1 analogs Several HKUST-1 analogs have already been synthesized, but several research groups have investigated the properties of the HKUST-1 structure by means of theoretical calculations. For this purpose, additional metal centers were incorporated into the framework on the theoretical level, which have not been used for the synthesis (e.g. Sc, V, Ti, W, Cd). Theoretical study on a mixed-metal HKUST-1 containing Cu in combination with various other metals (e.g. W, Re, Os, Ir, Pt, Au) were also reported, of which several metal combinations have not been synthesized.

References

Illustrations

Worked examples

Example 1 — a first encounter with HKUST-1

Start with the simplest possible case. Write down what HKUST-1 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 HKUST-1 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 HKUST-1 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 HKUST-1

In research: HKUST-1 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 HKUST-1 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: HKUST-1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Copper(II) compounds, Metal-organic frameworks, so understanding it makes those chapters shorter.
In everyday life: Look for HKUST-1 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 HKUST-1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HKUST-1 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 HKUST-1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HKUST-1 in simple terms?

HKUST-1, also known as MOF-199, is a material in the class of metal-organic frameworks (MOFs). It is named after the Hong Kong University of Science and Technology.

Why does HKUST-1 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 HKUST-1?

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 HKUST-1.