Thallium(I) Hydroxide

Thallium(I) hydroxide^[1]

Names
IUPAC name thallium(I) hydroxide
Other names thallous hydroxide
Identifiers
CAS Number	12026-06-1 Y
3D model (JSmol)	Interactive image
ChemSpider	141413 Y
EC Number	234-708-8
PubChem CID	160963
UNII	847N2ZKW5S Y
InChI InChI=1S/H2O.Tl/h1H2;/q;+1/p-1 Y Key: QGYXCSSUHCHXHB-UHFFFAOYSA-M Y InChI=1/H2O.Tl/h1H2;/q;+1/p-1 Key: QGYXCSSUHCHXHB-REWHXWOFAR
SMILES [Tl+].[OH-]
Properties
Chemical formula	TlOH
Molar mass	221.39 g·mol−1
Appearance	yellow needles
Density	7.44 g/cm3
Melting point	decomposes at 139°C
Solubility in water	34.3 g/(100 g) at 18°C
Thermochemistry
Std molar entropy (So298)	88.0 J·mol−1·K−1
Std enthalpy of formation (ΔfH⦵298)	−238.9 kJ·mol−1
Hazards
Main hazards	Very toxic Corrosive Dangerous for the environment
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H300, H330, H373, H411
GHS precautionary statements	P260, P264, P270, P271, P273, P284, P301+310, P304+340, P310, P314, P320, P330, P391, P403+233, P405, P501
NFPA 704 (fire diamond)	0 4 1 COR
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) hydroxide, also called thallous hydroxide, TlOH, is a hydroxide of thallium, with thallium in oxidation state +1.

Thallium(I) hydroxide is obtained from the decomposition of thallium(I) ethoxide in water.^[3]

CH
3CH
2OTl + H
2O → TlOH + CH
3CH
2OH

This can also be done by direct reaction of thallium with ethanol and oxygen gas.

4 Tl + 2 CH
3CH
2OH + O
2 → 2 CH
3CH
2OTl + 2 TlOH

Another method is the reaction between thallium(I) sulfate and barium hydroxide.

Tl
2SO
4 + Ba(OH)
2 → 2 TlOH + BaSO
4

Thallous hydroxide is a strong base; it dissociates to the thallous ion, Tl+
, except in strongly basic conditions. Tl+
resembles an alkali metal ion, such as Li+
or K+
.

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