Job's method
The Jobsche method , also known as continuous variation is that in a way, complex chemistry , is used to metal ligands to study equilibria. The molar ratios of the metal cation and the ligands are varied, but the sum of the concentrations remains the same for every ratio. For example, the absorbance or the conductivity is measured for observation. The metal-ligand complex stoichiometry can be calculated from the measurements.
The principle of continuous variations was used by Iwan Iwanowitsch Ostromislenski in 1911 to form a 1: 1 stoichiometry of the adduct formed between nitrobenzene and aniline . The method was also used by RB Denison in 1912 in a study of various liquid mixtures. However, the method is generally associated with the name of P. Job, who in 1928 published an extensive application for the study of a number of coordination compounds.
Individual evidence
- ^ Daniel C. Harris, Daniel C. Harris: Textbook of Quantitative Analysis . Ed .: Gerhard Werner, Tobias Werner. 8th edition. Springer Spectrum, Berlin, Heidelberg 2014, ISBN 978-3-642-37787-7 .
- ^ Zachary D. Hill, Patrick MacCarthy: Novel approach to Job's method: An undergraduate experiment. In: Journal of Chemical Education. 63, 1986, p. 162, doi : 10.1021 / ed063p162 .
- ^ Job, P. (1928): Recherches sur la Formation de Complexes Mineraux en Solution, et sur leur Stabilite. In: Annales de Chimie, Vol. 9, Ch. Moureu and G. Urbain, Eds., Paris: Masson et cie, Editeurs, Libraires de l'Academie de Medecine, pp. 113-134.