Stephen Liddle

Key takeaways

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

Reference excerpt

Stephen T. Liddle FRSC FRSE MAE is a British professor of inorganic chemistry at the University of Manchester. He has been Head of Inorganic Chemistry and Co-Director of the Centre for Radiochemistry Research at the University of Manchester since 2015, and Director of the National Nuclear User Facility at the Centre for Radiochemistry Research since 2019. His research has contributed significantly to the field of f-element chemistry.

Early life and education Liddle was born near Sunderland, in the North East of England, in 1974. In 1997 he graduated with a BSc(Hons) in chemistry with applied chemistry from Newcastle University. His degree included a year working as a research scientist for ICI Performance Chemicals at Wilton, Teesside. Alongside a stint in the Territorial Army, Liddle continued his studies at the university and received his PhD in 2000. His PhD supervisor was Professor W. Clegg.

Career and research After postdoctoral fellowships with P. J. Bailey at the University of Edinburgh, Keith Izod at Newcastle University as the Wilfred Hall Research Fellow, and Polly Arnold at the University of Nottingham, Liddle began his independent academic career at the University of Nottingham with a Royal Society University Research Fellowship (2007–2015) held with a proleptic Lectureship. He was promoted to Associate Professor and Reader in 2010 and Professor of Inorganic Chemistry in 2013. He moved to the University of Manchester in 2015 as Head of Inorganic Chemistry and Co-Director of the Centre for Radiochemistry Research. He is Director of the National Nuclear User Facility at the Centre for Radiochemistry Research since 2019, and he held an Engineering and Physical Sciences Research Council Established Career Fellowship (2015–2021). He was Chairman of COST Action CM1006, a 22 country, research network of over 120 research groups in f-block chemistry (2011–2015), is an advisor to the Commonwealth Scholarship Commission (2013–), and was an elected category 3 member of Senate, the University of Manchester (2016–2019). Liddle's research is focused on synthetic inorganic chemistry, particularly making early transition metal, lanthanide, and actinide complexes to explore their structure, bonding, reactivity, and magnetism. In 2011 he reported a single-molecule magnet based on depleted uranium. In 2012 his research group was the first to synthesize a molecular terminal uranium(V) nitride. In 2013 he reported the isolation of a terminal uranium(VI) nitride akin to examples previously restricted to cryogenic matrix isolation experiments , and that formed the basis from which to report the electronic structure of uranium nitrides including quantifying the covalence of the uranium-nitrogen triple bond by using 15N NMR spectroscopy. In 2013, his research group disclosed the first f-element cyclobutadienyl complexes. Between 2014-2025 he reported a range of M=EH bonds (M = Th, U; E = N, P, As, and Sb) along with phosphide, arsenido, and stibido derivatives. In 2019 his research group isolated a uranium(V)-dinitrogen complex. In 2021, Liddle reported a tri-thorium cluster featuring two-electron σ-aromatic actinide metal-metal bonding, and in follow-up work reported one-electron analogues that exhibit exalted diamagnetism and were found to be open-shell aromatic superatoms. Before the synthesis of those metal-metal complexes, examples of actinide-actinide bonding had been restricted to matrix isolation experiments and fullerene-encapsulated species. In 2022, he reported a terminal neptunium(V)-mono(oxo) complex. Before the synthesis of this complex all transuranium-ligand multiple bond complexes required two or more metal-ligand multiple bonds to be stable. Following on from his reports of U=C double bonds over uranium oxidation states +3 to +6 , in 2022 and 2024 he reported neptunium- and plutonium- diphosphonioalkylidenes and -N -heterocyclic carbenes. In 2018 he introduced titanium as a catalytically active metal in molecular dinitrogen to ammonia catalysis chemistry, and in 2025, in collaboration with the Mazzanti group at École Polytechnique Fédérale de Lausanne, he reported catalytic conversion of side-on bound dinitrogen to ammonia at uranium. He has also reported investigations on the basic properties of actinides, including homologation of carbon monoxide, showing that the inverse-trans-influence is general, reversible oxidative addition/reductive elimination at uranium, demonstrating the structure-directing role of f-orbital overlap-driven covalency, establishing pushing-from-below for thorium, introducing Frustrated Lewis Pair chemistry to the actinides , explaining anomalous magnetism of uranium(IV), inverting the fundamental disproportionation chemistry of uranium, and using actinides to stabilise unusual main group species.

Honours and awards Liddle was elected Fellow of the Royal Society of Chemistry (FRSC) in 2011, to the Fellowship of the Royal Society of Edinburgh (FRSE), Scotland's national academy of science and letters, in 2022, and Member of Academia Europaea (MAE) in 2025. In 2025, Liddle became Member of the European Academy of Sciences and Arts, and a Member of the European Academy of Science in 2026. He was Vice President to the Executive Committee of the European Rare Earth and Actinide Society (ERES, 2012–2023), President Elect (2023-2026) and President (2026-), with the latter involving, as Founding Trustee, re-establishing ERES as a UK Charity. He was one of the Periodic Videos team awarded the IChemE Petronas Team Award for Excellence in Education and Training (2008). He is a recipient of the RSC Sir Edward Frankland Fellowship (2011), the RSC Radiochemistry Group Bill Newton Award in 2011, the RSC Corday-Morgan Prize in 2015, the RSC Tilden Prize in 2020, and a Royal Society of Chemistry Dalton Division Horizon Team Prize in 2021. He was a recipient of a Rising Star Award at the 41st International Conference on Coordination Chemistry in 2014. He was awarded an Alexander von Humboldt Foundation Friedrich Wilhelm Bessel Research award in 2019.

He was awarded the GDCh Alexander Todd - Hans Krebs Lectureship in 2023 He was awarded the Terrae Rarae Award of the Tage Der Seltenen Erden in 2025.

He was awarded a European Research Council (ERC) Starter Grant in 2009 and Consolidator Grant in 2014.

He has been a visiting professor at the University of Regensburg in Germany and the École Polytechnique Fédérale de Lausanne in Switzerland.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Stephen Liddle

Start with the simplest possible case. Write down what Stephen Liddle 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 Stephen Liddle 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 Stephen Liddle 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 Stephen Liddle

In research: Stephen Liddle 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 Stephen Liddle 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: Stephen Liddle is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alumni of Newcastle University, British chemists, British inorganic chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Stephen Liddle 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.

How to study Stephen Liddle in 20 minutes

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

Frequently asked questions

What is Stephen Liddle in simple terms?

Stephen T. Liddle FRSC FRSE MAE is a British professor of inorganic chemistry at the University of Manchester.

Why does Stephen Liddle 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 Stephen Liddle?

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 Stephen Liddle.