IUPAC was formed in 1919 by chemists from industry and academia, who recognized the need for international standardization in chemistry.

The standardization of weights, measures, names and symbols is essential to the well being and continued success of the scientific enterprise and to the smooth development and growth of international trade and commerce.

This desire for international cooperation among chemists and facilitation of the work of the international, but fragmented, chemistry community were the earliest characteristics of the Union. Even before the creation of IUPAC (1919), a predecessor body, the International Association of Chemical Societies (IACS), had met in Paris in 1911 and produced a set of proposals for the work that the new Association should address.

These included:

  • Nomenclature of inorganic and organic chemistry;
  • Standardization of atomic weights;
  • Standardization of physical constants;
  • Editing tables of properties of matter;
  • Establishing a commission for the review of work;
  • Standardization of the formats of publications;
  • Measures required to prevent repetition of the same papers.

Although 1911 might now seem an early date for chemists to start talking about the possibility of and need for international collaboration and standardization, the first international attempt at organizing organic chemical nomenclature — the Geneva Nomenclature of 1892 — grew out of a series of international meetings, the first of which was organized by KekulĂ© in 1860.


In 2019, IUPAC celebrated its 100th anniversary > see iupac.org/100/
A Special issue of Chem Int was prepared and released in July 2019 > see content and full text



Chemistry historically emerged and developed as an interdisciplinary scientific field, with a broad definition of its borders. Paraphrasing Linus Pauling’s definition of the chemical bond “whatever is convenient to the chemist to define as a bond”, chemistry can be defined as a discipline encompassing all areas which are of interest to chemists and where molecular science makes significant contributions. The rich and diverse world of modern chemistry encompasses remarkable intellectual accomplishments, scientific creativity and originality and the generation of new knowledge.

IUPAC serves the international scientific endeavor in the dual function of a basic science and a mission-oriented Union. The Union is in a unique position to contribute to the central interdisciplinary chemical sciences. Strengthening international chemistry, striving towards inspiring high standards of excellence and relevance in academic and industrial research and promoting the service of chemistry to society and to global issues, these are the visions that shape IUPAC’s activities towards the 21st century.