Hassium tetroxide

Hassium tetroxide (also hassium(VIII) oxide) is the inorganic compound with the formula HsO₄. It is the highest oxide of hassium, a transactinide transition metal. It has little use outside of scientific interest, where it is often studied in comparison to osmium tetroxide and ruthenium tetroxide, its lighter octavalent group 8 element analogs.

Hassium tetroxide

Stick model hassium tetroxide
Names
Preferred IUPAC name Hassium tetraoxide
Systematic IUPAC name Tetraoxohassium
Other names Hassium(VIII) oxide
Identifiers
3D model (JSmol)	Interactive image
InChI InChI=1S/4O.Hs Key: ZEDIDOIMNXPGSR-UHFFFAOYSA-N
SMILES O=[Hs](=O)(=O)=O
Properties
Chemical formula	HsO4
Molar mass	334 g·mol−1
Structure[1]
Molecular shape	tetrahedral (predicted)
Related compounds
Other cations	Osmium(VIII) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Physical properties

Because of the extreme cost and difficulty of producing hassium, hassium tetroxide has never been obtained in macroscopic amounts, as only a few molecules have ever been synthesized. As a result, many of its physical properties are experimentally uncharacterized and unknown. However, most research available generally shows hassium tetroxide to behave like a typical congener to osmium tetroxide. Hassium tetroxide is less volatile than osmium tetroxide.^[2][3][4]

Synthesis

Hassium tetroxide can be obtained by reacting atomic hassium with oxygen at 600 °C.^[3][2]

Hs + 2 O₂ → HsO₄

Reactions

Hassium tetroxide can be combined with sodium hydroxide in an acid-base reaction, in which case it acts like the acid, to form sodium hassate(VIII):^[5]

HsO₄ + 2 NaOH → Na₂[HsO₄(OH)₂]