Arnold's research focuses on exploratory synthetic chemistry, particularly in making complexes that exhibit unusual structure-bonding in early transition metal, and lanthanide and actinide chemistry. Such knowledge underpins the discovery of catalysts and our understanding of the behaviour of nuclear waste. File:DEHHEF.png|thumb|right|Structure of C6H62 from Arnold's lab Arnold was a Fulbright Programpostdoctoralfellow at Massachusetts Institute of Technology where she worked with Christopher C. Cummins before returning to the UK to a lectureship in 1999. Her research is focused on the design and synthesis of highly reactive f-block complexes that can activate inert small molecules such as carbon oxides, dinitrogen, and hydrocarbons, and that can provide fundamental information on structure and bonding at the bottom of the periodic table. Arnold has given lectures around the world, advised the government and industry, and appears regularly on mainstream media and social media to discuss the importance and benefits of diversity in the science, technology, engineering, and mathematics workforce.
Awards and honours
Arnold was awarded Rosalind Franklin Award in 2012 for her scientific achievements, and her suitability as a role model and proposal to promote women in science, technology, engineering, and mathematics. This award was used to fund the creation of the documentary film A Chemical Imbalance, where she is the executive producer. That same year, she was also awarded the Royal Society of Chemistry's Corday-Morgan Prize for her "outstanding contributions to the application of organometallic uranium chemistry to small molecule activation". In 2012 she was elected a Fellow of the Royal Society of Edinburgh. She was appointed Officer of the Order of the British Empire in the 2017 Birthday Honours for services to chemistry and women in STEM. In 2018, she was awarded the Royal Society of ChemistrySir Geoffrey Wilkinson award for her work on transuranic organometallic chemistry, and is so far, the only woman to have been awarded this award since its inception in 1999. She was elected a Fellow of the Royal Society in 2018 for substantial contributions to the improvement of natural knowledge.