Thallium(I) sulfide

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Thallium(I) sulfide
IUPAC name
Thallium(I) sulfide
Other names
thallous sulfide, thallous sulphide
3D model (JSmol)
ECHA InfoCard 100.013.865
EC Number
  • 215-250-8
  • S([Tl])[Tl]
Molar mass 440.833 g/mol
Appearance black crystalline solid
Density 8.390 g/cm3
Melting point 448 °C (838 °F; 721 K)
Boiling point 1,367 °C (2,493 °F; 1,640 K)
−88.8·10−6 cm3/mol
Trigonal, hR81
R3, No. 146
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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]