Praseodymium(III) acetate

Praseodymium(III) acetate is an inorganic salt composed of a Praseodymium atom trication and three acetate groups as anions. This compound commonly forms the dihydrate, Pr(O₂C₂H₃)₃·2H₂O.

Preparation

Praseodymium(III) acetate can be formed by the reaction of acetic acid and praseodymium(III) oxide:

$\mathrm{𝟨}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮𝖧\mathsf{+}𝖯{𝗋}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟥}}\stackrel{T}{\to }\mathrm{𝟤}𝖯𝗋\mathsf{(}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{+}\mathrm{𝟥}{𝖧}_{\mathrm{𝟤}}𝖮$

Praseodymium(III) carbonate and praseodymium(III) hydroxide can also be used:

$\mathrm{𝟨}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮𝖧\mathsf{+}𝖯{𝗋}_{\mathrm{𝟤}}\mathsf{(}𝖢{𝖮}_{\mathrm{𝟥}}{\mathsf{)}}_{\mathrm{𝟥}}\stackrel{T}{\to }\mathrm{𝟤}𝖯𝗋\mathsf{(}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{+}\mathrm{𝟥}{𝖧}_{\mathrm{𝟤}}𝖮\mathsf{+}\mathrm{𝟥}𝖢{𝖮}_{\mathrm{𝟤}}$↑

$\mathrm{𝟨}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮𝖧\mathsf{+}\mathrm{𝟤}𝖯𝗋\mathsf{(}𝖮𝖧{\mathsf{)}}_{\mathrm{𝟥}}\stackrel{T}{\to }\mathrm{𝟤}𝖯𝗋\mathsf{(}𝖢{𝖧}_{\mathrm{𝟥}}𝖢𝖮𝖮{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{+}\mathrm{𝟨}{𝖧}_{\mathrm{𝟤}}𝖮$

Structure

According to X-ray crystallography, anhydrous praseodymium acetate is a coordination polymer. Each Pr(III) center is nine-coordinate, with two bidentate acetate ligands and the remaining sites occupied by oxygens provided by bridging acetate ligands. The lanthanum and holmium compounds are isostructural.

Decomposition

When the dihydrate is heated, it decomposes to the anhydrous, which then decomposes into praseodymium(III) oxyacetate(PrO(O₂C₂H₃)) then to praseodymium(III) oxycarbonate, and at last to praseodymium(III) oxide.

See also

• Neodymium acetate
• Praseodymium
• Acetic acid
• Lanthanide