Selenocyanates
| Selenocyanates |
 Selenocyanate anion |
 Organic selenocyanate, R = organyl radical (e.g. alkyl radical, aryl radical, etc.). The selenocyanate group is marked in blue . |
As selenocyanates the inorganic be salts and the organic esters of volatile selenocyanic acid (HSeCN), respectively. In the inorganic salts, the proton of selenocyanic acid has been replaced by an alkali, alkaline earth or other cation . In the organic esters, the free proton of selenocyanic acid (HSeCN) has been replaced by an alkyl , aryl , alkylaryl or other organic radical. The selenocyanate ion (NCSe - ) can coordinate to the central atom ( metal atom ) as a ligand in complexes both via the nitrogen atom and via the selenium atom . In its chemical behavior it is similar to the halides and is therefore counted to the group of pseudohalides .
synthesis
Potassium selenocyanate is made from potassium cyanide and gray selenium powder through an insertion reaction . Sodium selenocyanate is obtained analogously from sodium cyanide . Alkyl selenocyanates can be prepared from alkyl bromides or alkyl chlorides by reaction with potassium selenocyanate in alcoholic solution. Aromatic selenocyanates can be synthesized from diazonium salts by reaction with potassium selenocyanate.
Individual evidence
- ^ A b Heinrich Rheinboldt in Houben-Weyl Methods of Organic Chemistry , edited by Eugen Müller, Otto Bayer, Hans Meerwein and Karl Ziegler, Volume 9, sulfur, selenium and tellurium compounds , Thieme Verlag, Stuttgart, 1955, there 937– 951
- ^ NN Greenwood and A. Earnshaw: Chemistry of the elements , VCH Verlag, Weinheim / Bergstrasse, pages 381–383, ISBN 3-527-26169-9 .