Protactinium(IV) bromide

Template:Chembox Protactinium(IV) bromide is an inorganic compound. It is an actinide halide, composed of protactinium and bromine. It is radioactive, and has the chemical formula of PaBr₄. It may be due to the brown color of bromine that causes the appearance of protactinium(IV) bromide to be brown crystals. Its crystal structure is tetragonal. Protactinium(IV) bromide is sublimed in a vacuum at 400 °C. The protactinium(IV) halide closest in structure to protactinium(IV) bromide is protactinium(IV) chloride.

Preparation

Protactinium(IV) bromide can be prepared by reacting protactinium(V) bromide with hydrogen gas or aluminium:

$\mathrm{𝟥}𝖯𝖺𝖡{𝗋}_{\mathrm{𝟧}}\mathsf{+}𝖠𝗅\stackrel{400-450^{o}C}{\to }\mathrm{𝟥}𝖯𝖺𝖡{𝗋}_{\mathrm{𝟦}}\mathsf{+}𝖠𝗅𝖡{𝗋}_{\mathrm{𝟥}}$

$\mathrm{𝟤}𝖯𝖺𝖡{𝗋}_{\mathrm{𝟧}}\mathsf{+}{𝖧}_{\mathrm{𝟤}}\stackrel{800^{o}C}{\to }\mathrm{𝟤}𝖯𝖺𝖡{𝗋}_{\mathrm{𝟦}}\mathsf{+}\mathrm{𝟤}𝖧𝖡𝗋$

Properties

Protactinium(IV) bromide reacts with antimony trioxide to form protactinium bromate:

$\mathrm{𝟥}𝖯𝖺𝖡{𝗋}_{\mathrm{𝟦}}\mathsf{+}𝖲{𝖻}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟥}}\stackrel{150-200^{o}C}{\to }\mathrm{𝟥}𝖯𝖺𝖮𝖡{𝗋}_{\mathrm{𝟤}}\mathsf{+}\mathrm{𝟤}𝖲𝖻𝖡{𝗋}_{\mathrm{𝟥}}$

See also

• Protactinium(V) bromide