chemistry

Hexanitrohexaazaisowurtzitane

Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane rather than just read about it. In short: Hexanitrohexaazaisowurtzitane, also called HNIW and CL-20, is a polycyclic nitroamine explosive with the formula C6H6N12O12. It has a better oxidizer-to-fuel ratio than conventional HMX or RDX.

Key takeaways

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

Reference excerpt

Hexanitrohexaazaisowurtzitane, also called HNIW and CL-20, is a polycyclic nitroamine explosive with the formula C6H6N12O12. It has a better oxidizer-to-fuel ratio than conventional HMX or RDX. It releases 20% more energy than traditional HMX-based propellants.

History and use In the 1980s, CL-20 was developed by the China Lake facility, primarily to be used in propellants. While most development of CL-20 has been fielded by the Thiokol Corporation, the US Navy (through Office of Naval Research (ONR)) has also been interested in CL-20 for use in rocket propellants, such as for missiles, as it has lower observability characteristics such as less visible smoke. Thus far, CL-20 has only been used in the AeroVironment Switchblade 300 "kamikaze" drone, but is undergoing testing for use in the Lockheed Martin [LMT] AGM-158C Long Range Anti-Ship Missile (LRASM) and AGM-158B Joint Air-to-Surface Standoff Missile-Extended Range (JASSM-ER). The Indian Armed Forces have also looked into CL-20. The Taiwanese National Chung-Shan Institute of Science and Technology inaugurated a CL-20 production facility in 2022 with reported integration into the Hsiung Feng II (HF-2) and Hsiung Feng III (HF-3) product lines.

Synthesis

First, benzylamine (1) is condensed with glyoxal (2) under acidic and dehydrating conditions to yield the first intermediate compound (3). Four benzyl groups selectively undergo hydrogenolysis using palladium on carbon and hydrogen. The amino groups are then acetylated during the same step using acetic anhydride as the solvent (4). Finally, compound 4 is reacted with nitronium tetrafluoroborate and nitrosonium tetrafluoroborate, resulting in HNIW.

Cocrystals In August 2011, Adam Matzger and Onas Bolton published results showing that a cocrystal of CL-20 and TNT had twice the stability of CL-20—safe enough to transport, but when heated to 136 °C (277 °F) the cocrystal may separate into liquid TNT and a crystal form of CL-20 with structural defects that is somewhat less stable than CL-20. In August 2012, Onas Bolton et al. published results showing that a cocrystal of 2 parts CL-20 and 1 part HMX had similar safety properties to HMX, but with a greater firing power closer to CL-20.

Polymeric derivatives In 2017, K.P. Katin and M.M. Maslov designed one-dimensional covalent chains based on the CL-20 molecules. Such chains were constructed using CH2 molecular bridges for the covalent bonding between the isolated CL-20 fragments. It was theoretically predicted that their stability increased with efficient length growth. A year later, M.A. Gimaldinova and colleagues demonstrated the versatility of CH2 molecular bridges. It is shown that the use of CH2 bridges is the universal technique to connect both CL-20 fragments in the chain and the chains together to make a network (linear or zigzag). It is confirmed that the increase of the effective sizes and dimensionality of the CL-20 covalent systems leads to their thermodynamic stability growth. Therefore, the formation of CL-20 crystalline covalent solids seems to be energetically favorable, and CL-20 molecules are capable of forming not only molecular crystals but bulk covalent structures as well. Numerical calculations of CL-20 chains and networks' electronic characteristics revealed that they were wide-bandgap semiconductors.

Illustrations

Worked examples

Example 1 — a first encounter with Hexanitrohexaazaisowurtzitane

Start with the simplest possible case. Write down what Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane

In research: Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane 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: Hexanitrohexaazaisowurtzitane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Explosive chemicals, Nitroamines, Rocket fuels, so understanding it makes those chapters shorter.
In everyday life: Look for Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane in 20 minutes

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

Frequently asked questions

What is Hexanitrohexaazaisowurtzitane in simple terms?

Hexanitrohexaazaisowurtzitane, also called HNIW and CL-20, is a polycyclic nitroamine explosive with the formula C6H6N12O12. It has a better oxidizer-to-fuel ratio than conventional HMX or RDX.

Why does Hexanitrohexaazaisowurtzitane 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 Hexanitrohexaazaisowurtzitane?

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 Hexanitrohexaazaisowurtzitane.