Kurnakov test
The Kurnakov test, also known as the Kurnakov reaction , is a detection reaction developed by the Soviet chemist Nikolai Semjonowitsch Kurnakow . The reaction uses the phenomenon of the trans effect to differentiate between cis and trans isomers of a square-planar complex of the type: [PtA 2 X 2 ] (A = NH 3 , X = halogen or acid radical) by using an aqueous solution treated with thiourea . It is widely used in platinum manufacturing.
use
The Kurnakow test is used to differentiate between cisplatin and transplatin . In a hot, aqueous solution, the cis compound reacts with aqueous thiourea solution to form a deep yellow solution from which yellow needles of tetrakisthiourea platinum dichloride separate out on cooling. The trans compound, on the other hand, reacts to form a colorless solution from which white needles made of trans- bisthiourea dichloridoplatinum (II) settle under cooling .
literature
- N. Kurnakow: About complex metal bases; First treatise . In: Journal for Practical Chemistry . tape 50 , no. 1 , July 9, 1894, p. 481 , doi : 10.1002 / prac.18940500144 .
Individual evidence
- ↑ George B. Kauffman: The Life and Work of Nikolai Semenovich Kurnakov . In: Platinum Metals Rev . tape 26 , no. 3 , 1982, pp. 129–133 ( platinummetalsreview.com [PDF; accessed June 28, 2015]).