Rosalind Franklin

Chemist & X-ray Crystallographer
  • Born 25 July 1920 – Notting Hill, London, England
  • Died 16 April 1958 – Chelsea, London, England
  • Fields Physical Chemistry, X-ray Crystallography
  • Known for Structure of DNA, RNA & viruses; structure of coal & graphite

English chemist and X-ray crystallographer whose experimental insight into the molecular structure of DNA, RNA, viruses, coal and graphite helped shape modern molecular biology and materials science. Her X-ray diffraction data on DNA, including the image later known as “Photo 51”, were pivotal for deducing the DNA double helix, although this role was only widely recognised after her death.

Across a brief but exceptionally productive career she combined rigorous physical chemistry with meticulous crystallography, moving from wartime coal research to leading-edge studies of nucleic acids and viruses. She died at the age of 37, but numerous institutions, awards and even a European Mars rover now bear her name.

DNA Structure X-ray Diffraction Structural Virology Carbon Materials

Education

PhD in Physical Chemistry
University of Cambridge (Newnham College), UK
1942 – 1945
  • Doctoral thesis: The physical chemistry of solid organic colloids with special reference to coal.
  • Research on the microstructure and porosity of coal, informing wartime fuel technology.
BA / Natural Sciences Tripos (Chemistry)
Newnham College, University of Cambridge, UK
1938 – 1941
  • Specialised in chemistry within the Natural Sciences Tripos.
  • Awarded second-class honours, accepted at the time as a degree-level qualification for employment.
Schooling
St Paul’s Girls’ School, London, UK
1930s
  • Excelled in science, Latin and modern languages; gained early exposure to physics and chemistry.
  • Developed an interest in quantitative problem-solving and experimental work.

Research Positions

Research Leader, Virus Structure Group
Birkbeck College, University of London, UK
1953 – 1958
  • Led pioneering work on the structures of RNA viruses, especially tobacco mosaic virus and poliovirus.
  • Applied X-ray diffraction methods to understand virus symmetry and assembly.
Research Associate, Biophysics Unit
King’s College London, UK
1951 – 1953
  • Generated high-resolution X-ray diffraction patterns of DNA fibres, clarifying A- and B-form DNA.
  • Produced Photo 51, an exceptionally clear diffraction image essential for deducing the DNA double helix.
Postdoctoral Researcher (Chercheur)
Laboratoire Central des Services Chimiques de l'État, Paris, France
1947 – 1950
  • Worked with Jacques Mering on X-ray analysis of carbon and coal-derived materials.
  • Established expertise in crystallographic methods and the fine structure of disordered solids.
Assistant Research Officer
British Coal Utilisation Research Association (BCURA), UK
1942 – 1947
  • Investigated the microstructure and thermal properties of coal for wartime energy applications.
  • Work formed the basis of her PhD and contributed to improved understanding of carbon materials.

Areas of Expertise

X-ray diffraction & crystallography Nucleic acid structure Structural virology Coal & graphite microstructure Physical chemistry

Key Scientific Contributions

DNA Structure & Photo 51

King’s College London – DNA fibres and diffraction

Quantitative, carefully interpreted experimental data underpinned later models of the DNA double helix.

  • Produced X-ray diffraction patterns of highly ordered DNA fibres, distinguishing between A- and B-form DNA.
  • Captured Photo 51, a B-form DNA diffraction image that revealed a clear helical signature and key parameters such as the pitch and radius of the helix.
  • Showed, through systematic analysis, that the phosphate backbone must lie on the outside of the DNA molecule.

Coal, Carbon & Graphite

BCURA & Paris – Physical chemistry of disordered solids
  • Defined structural classes of coal based on porosity and response to heat, informing industrial use and carbonisation processes.
  • Clarified the transition from amorphous carbon in coal to more ordered forms approaching graphite.
  • Helped establish X-ray diffraction as a powerful tool for characterising complex, partially ordered materials.

Structures of Viruses

Birkbeck College – RNA viruses
  • Led structural studies of tobacco mosaic virus, demonstrating how identical protein subunits assemble around an RNA core.
  • Extended approaches to other plant viruses and to poliovirus, contributing to early understanding of virus symmetry and organisation.
  • Laid groundwork for later high-resolution models of viral particles and their life cycles.

Selected Publications (Representative)

Titles below are representative of her major themes (coal and carbons, nucleic acids, and viruses) rather than an exhaustive list.

  • Studies on the physical chemistry and microstructure of coal and carbonised materials, establishing categories of coal based on porosity and thermal behaviour.
  • Articles on the X-ray diffraction of DNA fibres, clarifying the helical nature of DNA and constraining possible structural models.
  • Papers on the X-ray analysis of tobacco mosaic virus and related plant viruses, illuminating how identical protein subunits assemble into rod-like particles.

Honours & Legacy

Posthumous recognition
  • Recognition of her central role in the discovery of the DNA double helix grew substantially after the 1962 Nobel Prize awarded to Crick, Watson and Wilkins.
  • Numerous buildings, university programmes and awards have been named in her honour, including prizes for women in science.
  • The European Mars rover of the ExoMars mission was named Rosalind Franklin, reflecting her enduring scientific legacy.

Scientific Legacy

  • Her work set methodological standards for careful experimental design, data quality and conservative structural interpretation.
  • Serves as a symbol of the importance of recognition, collaboration and ethics in scientific discovery.
  • Frequently cited as a role model and inspiration for women pursuing careers in physics, chemistry and biology.

Personal Profile

Franklin was known for her intellectual independence, exacting scientific standards and direct communication style. Fluent in French and comfortable working across cultures, she combined theoretical understanding with experimental craftsmanship and maintained a strong sense of public duty, from wartime research to mentoring younger scientists.