Nomenclature
CAS number: 1314-68-7
Dirhenium heptoxide.
O
7Re
2; mol wt 484.41.
O 23.12%, Re 76.88%.
Re
2O
7.
Description and references
Prepd from rhenium metal or its lower oxides
in a stream of air or oxygen at 400-425°: Noddack, Noddack, Naturwissenschaften 17, 93 (1929); Z. Anorg. Allg. Chem. 181, 1 (1929); 215, 129 (1933); Briscoe et al., Nature 129, 618 (1932); Melaven et al., Inorg. Synth. 3, 188 (1950). Crystal structure: Krebs et al., Chem. Commun. 1968, 263.
Properties
Canary-yellow, very deliquescent crystals. Begins
to sublime at 250°. mp 300.3°; bp 360.3°: Smith et al., J. Am. Chem. Soc. 74, 4964 (1952). Freely sol in water, alcohol,
ether, ethyl acetate, dioxane, pyridine. Readily absorbs water forming
perrhenic acid, HReO4.