Rhenium Heptoxide
Title: Rhenium Heptoxide
CAS Registry Number: 1314-68-7
Additional Names: Dirhenium heptoxide
Molecular Formula: O7Re2
Molecular Weight: 484.41
Percent Composition: O 23.12%, Re 76.88%
Line Formula: Re2O7
Literature 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.
Melting point: mp 300.3°
Boiling point: bp 360.3°: Smith et al., J. Am. Chem. Soc. 74, 4964 (1952)

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