Vanadium sulfide
Vanadium sulfides are inorganic chemical compounds of vanadium from the group of sulfides .
Overview
The vanadium- sulfur system is characterized by a large number of different compounds. Fifteen compounds are documented in the literature, the composition of which lies between V 3 S and VS 4 . All connections have areas of homogeneity, some of which are considerable. From the melts present at high temperature, sulfides are initially obtained which have approximately the composition VS, V 2 S 3 and VS 4 . Subsequent annealing at lower temperatures or stoichiometrically targeted synthesis from the elements then results in more or less reproducible evidence for other, additional compounds. The compound V 2 S 5 , which is produced by the thermal decomposition of ammonium thiovanadate (NH 4 ) 3 VS 4 and is amorphous, occupies a special position here.
properties
Vanadium sulfides are gray to black solids that are hardly attacked by dilute acids and more strongly by alkalis . VS 4 can be completely dissolved by alkali lye. Sulphides with a higher sulfur content can be broken down into lower sulphides in a high vacuum.
| Vanadium sulfide | ||||
| Surname | formula | CAS number | density | Melting point |
| Vanadium sulfide | V 2 S 2 | 12138-08-8 12166-27-7 |
4.2 | decomposition |
| Vanadium (III) sulfide | V 2 S 3 | 1315-03-3 | 4.7 | Decomposes at 600 ° C |
| Vanadium (IV) sulfide | VS 2 | 12166-28-8 | ||
| Vanadium (V) sulfide | V 2 S 5 | 12138-17-9 | 3.0 | decomposition |
| Patronite | VS 4 | ? | 2.82 | |
Individual evidence
- ^ Gmelin's Handbook of Inorganic Chemistry, Syst. No. 48, Vanadium, Part B, Lief, 1, pp. 267 ff .; Verl. Chemie, Weinheim, 1967
- ↑ a b Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1426.
- ^ A b c Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 451, 453 ( limited preview in Google Book search).