Thulium(III) chloride

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Thulium(III) chloride
IUPAC name
Thulium(III) chloride
Other names
Thulium chloride, thulium trichloride
EC number 236-904-9
Jmol-3D images Image
PubChem 61643
RTECS number XP0525000
Molar mass 275.292 g/mol
Appearance yellow crystals
Density 3.98 g/cm³
Melting point 824 °C (1,515 °F; 1,097 K)
Boiling point 1,490 °C (2,710 °F; 1,760 K)
heptahydrate: very soluble
Solubility heptahydrate: very soluble in ethanol[1]
Crystal structure Monoclinic, mS16
Space group C12/m1, No. 12
966.6 kJ/mol[3]
Main hazards Xi (Irritant)
S-phrases S26, S36[4]
Related compounds
Other anions
Thulium(III) oxide
Other cations
Erbium(III) chloride
Ytterbium(III) chloride
Thulium(II) chloride
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Thulium(III) chloride or thulium trichloride is the chemical compound composed of thulium and chlorine with the formula TmCl3. It forms yellow crystals. Thulium(III) chloride has the YCl3 (AlCl3) layer structure with octahedral thulium ions.[5]


The hydrated form of thulium(III) chloride can be obtained by adding thulium(III) oxide to concentrated hydrochloric acid.[1] Thulium(III) chloride reacts with strong bases to make thulium(III) oxide.


  1. ^ a b Spencer, James F. (1919). "The Metals of the Rare Earths". New York: Longmans, Green, and Co. p. 152. Retrieved 2008-06-27. 
  2. ^ "Chemistry: Periodic Table: Thulium: compound data (thulium (III) chloride)". WebElements. Retrieved 2008-06-27. 
  3. ^ Perry, Dale L.; Phillips, Sidney L. (1995). Handbook of Inorganic Compounds. CRC Press. p. 512. ISBN 0-8493-8671-3. Retrieved 2008-06-27. 
  4. ^ "439649 Thulium(III) chloride anhydrous, powder, 99.99% trace metals basis". Sigma-Aldrich. Retrieved 2008-06-27. 
  5. ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6