Károly Antal Than de Apát – also called as Carl von Than – (20 December 1834 – 5 July 1908) was a Hungarian

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field. Chemists study the composition of ...

who discovered

carbonyl sulfide Carbonyl sulfide is the chemical compound with the linear formula . It is a colorless flammable gas with an unpleasant odor. It is a linear molecule consisting of a carbonyl double bonded to a sulfur atom. Carbonyl sulfide can be considered to ...

in 1867.

Life

AKároly Than was born in Óbecse,

Kingdom of Hungary The Kingdom of Hungary was a monarchy in Central Europe that existed for nearly a millennium, from 1000 to 1946 and was a key part of the Habsburg monarchy from 1526-1918. The Principality of Hungary emerged as a Christian kingdom upon the Coro ...

Austrian Empire The Austrian Empire, officially known as the Empire of Austria, was a Multinational state, multinational European Great Powers, great power from 1804 to 1867, created by proclamation out of the Habsburg monarchy, realms of the Habsburgs. Duri ...

(today

Bečej Bečej (, ; , ) is a town and municipality located in the South Bačka District of the autonomous province of Vojvodina, Serbia. The town has a population of 19,492, while the municipality has 30,681 inhabitants. History Bečej was mentioned f ...

Serbia , image_flag = Flag of Serbia.svg , national_motto = , image_coat = Coat of arms of Serbia.svg , national_anthem = () , image_map = , map_caption = Location of Serbia (gree ...

). His mother was Otillia Setényi. He interrupted his education and joined the Hungarian army in the

war of independence Wars of national liberation, also called wars of independence or wars of liberation, are conflicts fought by nations to gain independence. The term is used in conjunction with wars against foreign powers (or at least those perceived as foreign) ...

1848 at the age of 14. On his return, he found his mother dead and his father ruined. Than worked in several pharmacies to earn money form completing his education. After attending a school in

Szeged Szeged ( , ; see also #Etymology, other alternative names) is List of cities and towns of Hungary#Largest cities in Hungary, the third largest city of Hungary, the largest city and regional centre of the Southern Great Plain and the county seat ...

, Than started to study medicine and later chemistry at the

University of Vienna The University of Vienna (, ) is a public university, public research university in Vienna, Austria. Founded by Rudolf IV, Duke of Austria, Duke Rudolph IV in 1365, it is the oldest university in the German-speaking world and among the largest ...

. He received his PhD for work with Josef Redtenbacher in 1858. After working for some time as assistant of Redtenbacher, he left to study with

Robert Bunsen Robert Wilhelm Eberhard Bunsen (; 30 March 1811 – 16 August 1899) was a German chemist. He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. The Bu ...

at the

University of Heidelberg Heidelberg University, officially the Ruprecht Karl University of Heidelberg (; ), is a public university, public research university in Heidelberg, Baden-Württemberg, Germany. Founded in 1386 on instruction of Pope Urban VI, Heidelberg is List ...

and with Charles-Adolphe Wurtz at the

University of Paris The University of Paris (), known Metonymy, metonymically as the Sorbonne (), was the leading university in Paris, France, from 1150 to 1970, except for 1793–1806 during the French Revolution. Emerging around 1150 as a corporation associated wit ...

. On his return to Redtenbacher in 1859, he worked as lecturer at the University of Vienna. The

University of Budapest A university () is an institution of tertiary education and research which awards academic degrees in several academic disciplines. ''University'' is derived from the Latin phrase , which roughly means "community of teachers and scholars". Univ ...

was in need of Hungarian-speaking professors due to a change from German to Hungarian teaching language in 1860. Theodor Wertheim changed to the

University of Graz The University of Graz (, formerly: ''Karl-Franzens-Universität Graz'') is a public university, public research university located in Graz, Austria. It is the largest and oldest university in Styria, as well as the second-largest and second-old ...

and Than was offered the vacant position which he occupied until his retirement in 1908. Than married Ervina Terézia Mária Albertina Kleinschmidt in 1872 and had five children. He published the first Hungarian chemistry journal (Magyar Chémiai Folyóirat) and was the president of the Hungarian Society of Natural Science from 1872 until his death. He was made baron in 1908, and died, suddenly, the same year.

Discovery of carbonyl sulfide

Than was aware of existence of the two compounds

carbon dioxide Carbon dioxide is a chemical compound with the chemical formula . It is made up of molecules that each have one carbon atom covalent bond, covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at norma ...

(CO₂) and

carbon disulfide Carbon disulfide (also spelled as carbon disulphide) is an inorganic compound with the chemical formula and structure . It is also considered as the anhydride of thiocarbonic acid. It is a colorless, flammable, neurotoxic liquid that is used as ...

(CS₂) and so he tried to synthesize COS. In his first experiments he reacted

carbon monoxide Carbon monoxide (chemical formula CO) is a poisonous, flammable gas that is colorless, odorless, tasteless, and slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the si ...

(CO) with

sulfur Sulfur ( American spelling and the preferred IUPAC name) or sulphur ( Commonwealth spelling) is a chemical element; it has symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms ...

. The reaction yielded some product which Than was unable to purify. The second approach to create the COS was by hydrolysis of

thiocyanic acid Thiocyanic acid is a chemical compound with the formula and structure , which exists as a tautomer with isothiocyanic acid (). The isothiocyanic acid tautomer tends to dominate with the compound being about 95% isothiocyanic acid in the vapor ...

. The reaction of

potassium thiocyanate Potassium thiocyanate is the chemical compound with the molecular formula KSCN. It is an important salt of the thiocyanate anion, one of the pseudohalides. The compound has a low melting point relative to most other inorganic salts. Uses Ch ...

and

sulfuric acid Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid (English in the Commonwealth of Nations, Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, ...

yielded a gas containing significant amount of byproducts ( HCN, H₂O and CS₂) and required purification. :KSCN + 2 H₂SO₄ + H₂O → KHSO₄ + NH₄HSO₄ + COS Than was able to characterize most of the properties of carbonyl sulfide and also tried to determine the chemical reactions of carbonyl sulfide. For these achievements, he received the Lieben Prize in 1868.

References

{{DEFAULTSORT:Than 1834 births 1908 deaths Hungarian chemists Chemists from Austria-Hungary University of Vienna alumni