Thallium(I) sulfide

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Thallium(I) sulfide
IUPAC name Thallium(I) sulfide
Other names thallous sulfide, thallous sulphide
CAS number 1314-97-2
PubChem 16683485
EC number 215-250-8
SMILES S([Tl])[Tl]
Molecular formula Tl2S
Molar mass 440.833 g/mol
Appearance black crystalline solid
Density 8.390 g/cm3
Melting point

448 °C, 721 K, 838 °F

Boiling point

1367 °C, 1640 K, 2493 °F

−88.8·10−6 cm3/mol
Crystal structure Trigonal, hR81
Space group R3, No. 146
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Thallium(I) sulfide, also known as thallous sulfide, is a chemical compound. Its chemical formula is Tl2S. It has thallium and sulfide ions in it. The thallium is in its +1 oxidation state.

Properties[change | change source]

Thallium(I) sulfide is a black solid. It reacts with acids to make hydrogen sulfide and a thallium salt.

Occurrence and preparation[change | change source]

It is found as a mineral called carlinite, but it is rare. It is the only thallium sulfide mineral that does not have another metal in it. It is made in the laboratory by reacting thallium(I) sulfate with hydrogen sulfide or by heating thallium and sulfur together.

Uses[change | change source]

It was used in some of the first infrared detectors. One of the first reliable infrared detectors used thallium sulfide and it was made in World War II.

Related pages[change | change source]