Dibromopentoxide

Structural formula
General
Surname	Dibromopentoxide
other names	Dibromopentaoxide; Bromine (V) oxide;
Molecular formula	Br 2 O 5
Brief description	white needles (as cocrystallisate with three molecules of propionitrile per formula unit)
External identifiers / databases
Wikidata	Q977125
properties
Molar mass	239.81 g mol −1
Physical state	firmly
Melting point	−20 ° C (as cocrystallizate with three molecules of propionitrile per formula unit, decomposition)
solubility	bad in propionitrile
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dibromopentoxide or bromine (V) oxide, Br ₂ O ₅ , is a compound of the elements bromine and oxygen , which is inconsistent under normal conditions, and a representative of halogen oxides . It is a colorless solid that can be isolated at low temperatures and decomposes into its elements from −20 ° C.

presentation

The compound can be obtained by reaction with ozone (ozonation) of elemental bromine at −78 ° C in propionitrile .

properties

Dibromopentoxide is the anhydride of bromic acid and behaves chemically accordingly. Like almost all halogen oxides, bromine (V) oxide has a strong oxidizing effect .

The compound crystallizes from propionitrile in the form of white needles with three molecules of propionitrile per formula unit. From a temperature of −40 ° C dibromopentoxide decomposes into the elements, sometimes explosively. The decomposition point is −20 ° C. In the compound, bromine is in the + V oxidation state and, as expected, has a pyramidal coordination . The double bonds to the terminal oxygen atoms have bond lengths between 160.6 and 161.3 pm . The bonds to the bridging oxygen atom are 187.5 pm and 189.6 pm long. In contrast to the homologous diiodopentoxide (I ₂ O ₅ ), the terminal oxygen atoms in the dibromopentoxide molecule are aligned and not aligned.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f D. Leopold, K. Seppelt: Dibromopentoxide Br ₂ O ₅ . In: Angew. Chem. 1994, pp. 1043-1044; doi : 10.1002 / anie.19941060921 .
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[leo-1] ↑ ^a ^b ^c ^d ^e ^f D. Leopold, K. Seppelt: Dibromopentoxide Br ₂ O ₅ . In: Angew. Chem. 1994, pp. 1043-1044; doi : 10.1002 / anie.19941060921 .

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.