Recombination (chemistry)

Recombination (according to IUPAC definition colligation , dt. Colligation called), the linkage of two atoms or molecules , each having a free electron , so the combination of two radicals , form a covalent bond . It is the opposite of the splitting of a molecule into two uncharged units, each with an unpaired electron (unimolecular homolysis ).

Example:

In the example above, the reaction proceeds to form a carbon - oxygen - single bond . Many other combinations are also possible, for example the formation of bonds between carbon atoms and transition metals . Many chain termination reactions also belong to this type of reaction.

Examples:

Formation of NH ₄ Cl fine dust ( ammonium chloride ) in exhaust gases from the elements or ammonia
Recombination of dioxins in exhaust gases
Capture of free radicals (created by fires) using flame retardants

Individual evidence

↑ Entry on colligation . In: IUPAC Compendium of Chemical Terminology (the “Gold Book”) . doi : 10.1351 / goldbook.C01153 Version: 2.3.3.
↑ P. Huston, JH Espenson, A. Bakac: Alkyl radical colligation and release by a chromium macrocycle . In: Inorg. Chem. , 1991, 30 (25), pp. 4826-4830, doi: 10.1021 / ic00025a027

[1] Entry on colligation . In: IUPAC Compendium of Chemical Terminology (the “Gold Book”) . doi : 10.1351 / goldbook.C01153 Version: 2.3.3.

[2] P. Huston, JH Espenson, A. Bakac: Alkyl radical colligation and release by a chromium macrocycle . In: Inorg. Chem. , 1991, 30 (25), pp. 4826-4830, doi: 10.1021 / ic00025a027