Article · Wikipedia archive · Last revised Jun 8, 2026

Thallium(I) fluoride

Thallium(I) fluoride is the inorganic compound with the formula TlF. It is a white solid, forming orthorhombic crystals. The solid is slightly deliquescent. It has a distorted sodium chloride (rock salt) crystal structure, due to the 6s2 inert pair on Tl+.

Last revised
Jun 8, 2026
Read time
≈ 2 min
Length
365 w
Citations
8
Source
Wikipedia ↗
Thallium(I) fluoride
source ↗
Names
Preferred IUPAC name
Thallium(I) fluoride
Other names
Thallium monofluoride
Thallous fluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.231
EC Number
  • 232-154-1
RTECS number
  • XG4900000
UNII
  • InChI=1S/FH.Tl/h1H;/q;+1/p-1 ☒N
    Key: CULOEOTWMUCRSJ-UHFFFAOYSA-M ☒N
  • F[Tl]
Properties
TlF
Molar mass 223.3817 g/mol
Appearance White crystals
Density 8.36 g cm−3
Melting point 327 °C (621 °F; 600 K)
Boiling point 655 °C (1,211 °F; 928 K) (decomposes)
78.6 g/100 mL (at 15 °C)1
Solubility slightly soluble in ethanol
−44.4·10−6 cm3/mol
Structure
Orthorhombic, oP8
Fmmm, No. 28
Hazards2
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H300, H330, H373, H411
P260, P264, P270, P271, P273, P284, P301+P310, P304+P340, P310, P314, P320, P321, P330, P391, P403+P233, P405, P501
Related compounds
Other anions
 Thallium(I) chloride

Thallium(I) bromide
Thallium(I) iodide

Other cations
 Gallium(III) fluoride

Indium(III) fluoride
Thallium(III) fluoride

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Thallium(I) fluoride is the inorganic compound with the formula TlF. It is a white solid, forming orthorhombic crystals. The solid is slightly deliquescent.1 It has a distorted sodium chloride (rock salt) crystal structure,34 due to the 6s2 inert pair on Tl+.5

This salt is unusual among the thallium(I) halides in that it is very soluble in water.6

Reactions

Thallium(I) fluoride can be prepared by the reaction of thallium(I) carbonate with hydrofluoric acid.3

References

References

  1. Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 407, ISBN 0-8493-8671-3, retrieved 2008-06-17
  2. "399833 Thallium(I) fluoride 99%". Sigma-Aldrich. Retrieved 2008-06-17.
  3. Wiberg, Nils; Wiberg, Egon; Holleman, A. F. (2001), Inorganic Chemistry, Academic Press, p. 1037, ISBN 0-12-352651-5, retrieved 2008-06-17
  4. Meyer, Gerd; Naumann, Dieter; Wesemann, Lars (2006), Inorganic Chemistry in Focus III, Wiley-VCH, p. 21, ISBN 3-527-31510-1, retrieved 2008-06-17
  5. Berastegui, P.; Hull, S. (2000). "The Crystal Structures of Thallium(I) Fluoride". Journal of Solid State Chemistry. 150 (2): 266. Bibcode:2000JSSCh.150..266B. doi:10.1006/jssc.1999.8587.
  6. Arora, M. G. (2003), P-block Elements, Anmol Publications, p. 35, ISBN 81-7488-563-3, retrieved 2008-06-17