In 1830, Zeise attempted to react platinum chloride with ethanol, leading to a series of platinum-based organometallic compounds. One of these compounds, originally referred to by Zeise himself as “"sal kalicoplatinicus inflammabilis"”, was subsequently named after him according to the tradition of the day – it is still called Zeise's salt. Zeise's claim that the newly discovered salt contained ethylene was received with distrust by Justus von Liebig, whose understandable attacks on Zeise were quite unjustified. The complex indeed contains ethylene. Attempts to establish the correct structure and composition of Zeise's salt drove much basic research during the second half of the 19th century and led to a greater sophistication in organometallic chemistry. The structure of Zeise's salt was definitively resolved only with the advent of X-ray crystallography and the nature of its platinum to ethylene bond was not understood until the development of the Dewar–Chatt–Duncanson model in the 1950s.