Thallium(I) hydroxide, also called thallous hydroxide, is a chemical compound with the chemical formula TlOH. It is a hydroxide of thallium, with thallium in oxidation state +1. It is a thallium(I) salt of water. It consists of thallium(I) cations Tl+ and hydroxide anions OH−.

Synthesis

Thallium(I) hydroxide is obtained from the decomposition of thallium(I) ethoxide in water. This can also be done by direct reaction of thallium with ethanol and oxygen gas. Another method is the reaction between thallium(I) sulfate and barium hydroxide.

Properties

Thallium(I) hydroxide is a strong base; it dissociates to thallium(I) cations, Tl+, and hydroxide anions, OH−, except in strongly basic conditions. Tl+ cation resembles an alkali metal cation, such as Li+, Na+ or K+.