| Honorific Prefix: | Sir |
| Ronald Sydney Nyholm | |
| Birth Date: | 1917 1, df=yes |
| Birth Place: | Broken Hill, New South Wales, Australia |
| Spouse: | Maureen Richardson (1948)[1] |
| Field: | Chemistry |
| Nationality: | Australian |
| Workplaces: | Eveready Battery Co University of Sydney University College London Sydney Technical College |
| Doctoral Advisor: | Christopher Ingold |
| Doctoral Students: | Robin Clark |
| Death Place: | Cambridge, England |
| Awards: | Fellow of the Royal Society[2] |
Sir Ronald Sydney Nyholm (29 January 1917 – 4 December 1971) was an Australian chemist who was a leading figure in inorganic chemistry in the 1950s and 1960s.
Born on 29 January 1917 as the fourth in a family of six children. Nyholm's father, Eric Edward Nyholm (1878–1932) was a railway guard. Nyholm's paternal grandfather, Erik Nyholm (1850–1887) was a coppersmith born in Nykarleby in the Swedish-speaking part of Finland, who migrated to Adelaide in 1873. Ronald Nyholm valued his Finnish roots and was particularly proud in his election in 1959 as Corresponding Member of the Finnish Chemical Society.
Hailing from the small mining town of Broken Hill, New South Wales, he was early exposed to the role of inorganic chemistry.[2] [3] He attended Burke Ward Public School and Broken Hill High School. Nyholm married Maureen Richardson of Epping, a suburb of Sydney, NSW, at the parish church in Kensington, London on 6 August 1948.[4]
After graduating from Broken Hill High School, he attended the University of Sydney (BSc, 1938; MSc, 1942) and then University College London (PhD, 1950, supervised by Sir Christopher Ingold; D.Sc., 1953).[1] On graduation Nyholm became a High School teacher – a contractual requirement of his scholarship to university.
He then joined the Eveready Battery Co as a chemist where he was frustrated that his work to make longer lasting batteries was not well received by the marketing department. He then returned to teaching but now in tertiary education. During World War II he was a Gas Officer as the civil defence forces were very concerned that the likely Japanese invasion would include gas attacks. He was lecturer, then senior lecturer in Chemistry at Sydney Technical College from 1940 to 1951, although on leave in London from 1947. From 1952 to 1954 he was associate professor of Inorganic Chemistry at the New South Wales University of Technology. In 1954 he was elected President of the Royal Society of New South Wales. In 1955, Nyholm returned to England as Professor of Chemistry at University College London, where he worked until his death on 4 December 1971 as a result of a motorcar accident on the outskirts of Cambridge, England.[2] [5]
Nyholm's research in inorganic chemistry was primarily concerned with the preparation of transition metal compounds, particularly those involving organo-arsenic ligands. His interest in organoarsenic chemistry was fostered at the University of Sydney by George Joseph Burrows (1888–1950). Using the strong chelating ligand diars, Nyholm demonstrated a range of oxidation states and coordination numbers for several of the transition metals.[6] Nyholm noted that the term 'unusual valence state' had an 'historical, but not chemical significance.' 'The definition of usual oxidation state refers to oxidation states that are stable in environments made up of those chemical species that were common in classical inorganic compounds, e.g. oxides, water and other simple oxygen donors, the halogens, excluding fluorine, and sulphur. Nowadays, however, such species constitute only a minority of the vast number of donor atoms and ligands that can be attached to metal.'
After joining Sydney Technology college in 1940 Nyholm formed a close personal friendship with Francis (Franky) Dwyer and they collaborated in their research. Despite heavy teaching loads, between 1942 and 1947 they reported complexes of rhodium, iridium, and osmium in seventeen papers in the Journal and Proceedings of the Royal Society of New South Wales.[7]
One of Nyholm's early successes was the preparation of an octahedral complex of trivalent nickel [Ni([[1,2-Bis(dimethylarsino)benzene|diars]])2Cl2]Cl, by aerial oxidation of the red salt of bivalent nickel [Ni([[1,2-Bis(dimethylarsino)benzene|diars]])2]Cl2.[8] He also described stable complexes of quadrivalent nickel such as the deep blue [Ni([[1,2-Bis(dimethylarsino)benzene|diars]])2Cl2] [ClO<sub>4</sub>]2, by nitric acid oxidation of the trivalent complex.[9] This stabilisation of higher oxidation states became significant in the Nyholm-Rail reaction where the ditertiary arsine, diars undergoes a condensation reaction to a tritertiary arsine, triars. Nyholm prepared examples of divalent octahedral complexes of the type M(diars)2X2, where X is Cl, Br or I, and M is Cr, Mn, Fe, Co, Ni, Mo, Tc, Ru, Pd, W, Re, Os, and Pt.
Many of these divalent complexes are sensitive to aerial oxidation. The chromium complex is oxidized by water. Indeed, previous attempts to prepare Cr(diars)2X2 had failed. The chromium compounds were eventually synthesized by his co-worker Anthony Nicholl Rail only a month before Nyholm's death, using rigorous air-free techniques.[10]
Together with Professor Ronald Gillespie, Nyholm developed the VSEPR (Valence shell electron pair repulsion) theory for the simple prediction of molecular geometry. This theory emphasized classical pictures of bonding, adapted to include features of quantum theory, but focusing on electron clouds of varying density within a probability envelope.
In his inaugural lecture as professor of chemistry at University College London, Nyholm spoke of his concern for the teaching of chemistry.[11] [12] In 1957 Nyholm organized the first of an annual series of Summer Schools at University College on new aspects of chemical knowledge and theory, and demonstrations of new equipment. In the early sixties, the Nuffield Foundation, at least partly as a result of Nyholm's influence, established the Science Teaching project, of which Nyholm was the first Chairman of the Chemistry Consultative Committee. This program led to the development of experiential GCE courses that emphasized the process of chemistry, rather than the recall of chemical facts, and explored the role of chemistry in society. In 1971 Nyholm published an article entitled 'Education for Change' in which he differentiated between education and training as it applies to chemistry.[13] He defined education as 'a process in which a person receives a training for a full life in a rapidly changing modern society, carried out in such a manner as will ensure the maximum development of the individual personality'. He was not a person who placed too much emphasis on fact-burdened and fact-tested learning such as in the National Curriculum developments in England in the nineteen-nineties.
Nyholm defined training for a full life as including:
Nyholm was associated with industry all of his life. One of his earliest positions was as a chemist at Eveready Batteries in Sydney. The application of science to useful products was of great importance to him, and he is purported to have admired the DuPont logo "Better things for better living through chemistry". He was an active consultant to a number of companies including ICI and Johnson Matthey in the UK and DuPont in the US.
The Nyholm Prize for Inorganic Chemistry[14] and the Nyholm Prize for Education,[15] founded by the Chemical Society in 1973, are now awarded biennially by the Royal Society of Chemistry.
The mineral Nyholmite is named after Nyholm.[16] It was discovered in Broken Hill in 2009 and its structure was elucidated by Elliot et al.[17]