Thorium (IV) sulfide

Crystal structure
__ Th 4+      __ S 2−
General
Surname	Thorium (IV) sulfide
other names	Thorium disulfide
Ratio formula	ThS 2
Brief description	purple-brown to purple solid
External identifiers / databases
CAS number 12138-07-7 EC number 235-242-8 ECHA InfoCard 100.032.026 PubChem 82937 Wikidata Q735059
properties
Molar mass	296.17 g mol −1
Physical state	firmly
density	7.36 g cm −3
Melting point	1905 ± 30 ° C
solubility	almost insoluble in water soluble in acids
Hazard and safety information
Radioactive
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Thorium (IV) sulfide is an inorganic chemical compound of thorium from the group of sulfides . In addition to this are the black thorium (II) sulfide ThS, the brown thorium (III) sulfide Th ₂ S ₃ , the black Th ₇ S ₁₂ (ThS _1.71 -ThS _1.76 ), the deep red polysulfide Th ₃ S ₇ and the oxide sulfide ThOS several other thorium sulfides are known.

Extraction and presentation

Thorium (IV) sulfide can (like the other thorium sulfides) be obtained by reacting thorium with sulfur .

${\displaystyle \mathrm {Th+2\ S\longrightarrow ThS_{2}} }$

It can also be prepared by reacting thorium (IV) hydride or thorium (IV) oxide with hydrogen sulfide at 1500 ° C.

${\displaystyle \mathrm {ThO_{2}+2\ H_{2}S\longrightarrow ThS_{2}+2\ H_{2}O} }$

properties

Thorium (IV) sulfide is a purple-brown to purple-colored solid. It has a crystal structure of the lead (II) chloride type (a = 426.8 pm, b = 726.4 pm, c = 861.7 pm). It decomposes at around 1905 ° C, releasing sulfur. Like all thorium compounds, thorium (IV) sulfide is radioactive.

use

Thorium (IV) sulfide can be used as a solid lubricant.

Individual evidence

1. ↑ ^{a b c d e f g h} Georg Brauer (Hrsg.): Handbook of Preparative Inorganic Chemistry . 3., reworked. Edition. tape II . Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1148 .
2. ^ ^{A b c} Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2011, pp. 489 ( limited preview in Google Book search).
3. ↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.