Rhenium oxide (VII)

Rhenium oxide
Rhenium oxide
Are common
Systematic ; name	Rhenium oxide ((VII))
Traditional names	Rhenium oxide ((VII)); rhenium anhydride
Chem. formula	Re 2 O 7
Physical properties
condition	light yellow crystals
Molar mass	484.41 g / mol
Density	6.14; 8.2 g / cm³
Thermal properties
T. melt.	300; 301.5; 304 ° C
T. bale.	355; 358.5; 360; 363 ° C
Like heat resistant.	166.2 J / (molK)
Enthalpy of Education	-1132.6 kJ / mol
Classification
Reg. CAS number	1314-68-7
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider

Rhenium (VII) oxide is an inorganic compound, rhenium metal oxide with the formula Re ₂ O ₇ , light yellow hygroscopic crystals, it dissolves in cold water, and reacts with hot water.

Content

Getting

The oxidation of metallic rhenium:

{\mathsf {4Re+7O_{2}\ {\xrightarrow {400^{o}C}}\ 2Re_{2}O_{7}}}

{\ displaystyle {\ mathsf {4Re + 7O_ {2} \ {\ xrightarrow {400 ^ {o} C}} \ 2Re_ {2} O_ {7}}}}

Decomposition by heating of rhenium (IV) oxide :

{\mathsf {7ReO_{2}\ {\xrightarrow {850^{o}C,vacuum}}\ 3Re+2Re_{2}O_{7}}}

{\ displaystyle {\ mathsf {7ReO_ {2} \ {\ xrightarrow {850 ^ {o} C, vacuum}} \ 3Re + 2Re_ {2} O_ {7}}}}

Oxidation of Rhenium (IV) Oxide :

{\mathsf {4ReO_{2}+3O_{2}\ {\xrightarrow {400^{o}C}}\ 2Re_{2}O_{7}}}

{\ displaystyle {\ mathsf {4ReO_ {2} + 3O_ {2} \ {\ xrightarrow {400 ^ {o} C}} \ 2Re_ {2} O_ {7}}}}

Decomposition by heating rhenium acid :

{\mathsf {2HReO_{4}\ {\xrightarrow {65-160^{o}C}}\ Re_{2}O_{7}+H_{2}O}}

{\ displaystyle {\ mathsf {2HReO_ {4} \ {\ xrightarrow {65-160 ^ {o} C}} \ Re_ {2} O_ {7} + H_ {2} O}}}

Physical Properties

Rhenium (VII) oxide forms light yellow diamagnetic crystals of rhombic syngony , space group P 2 ₁ 2 ₁ 2 ₁ , cell parameters a = 1.2508 nm, b = 1.5196 nm, c = 0.5448 nm.

Soluble in cold water and ethanol , react with hot water.

Chemical Properties

Decomposes on heating:

{\mathsf {2Re_{2}O_{7}\ {\xrightarrow {600^{o}C}}\ 4ReO_{2}+3O_{2}}}

{\ displaystyle {\ mathsf {2Re_ {2} O_ {7} \ {\ xrightarrow {600 ^ {o} C}} \ 4ReO_ {2} + 3O_ {2}}}}

Reacts with hot water:

{\mathsf {Re_{2}O_{7}+H_{2}O\ {\xrightarrow {90^{o}C}}\ 2HReO_{4}}}

{\ displaystyle {\ mathsf {Re_ {2} O_ {7} + H_ {2} O \ {\ xrightarrow {90 ^ {o} C}} \ 2HReO_ {4}}}}

Reacts with alkalis with the formation of perrenates :

{\mathsf {Re_{2}O_{7}+2NaOH\ {\xrightarrow {}}\ 2NaReO_{4}+H_{2}O}}

{\ displaystyle {\ mathsf {Re_ {2} O_ {7} + 2NaOH \ {\ xrightarrow {}} \ 2NaReO_ {4} + H_ {2} O}}}

It is an oxidizing agent :

{\mathsf {Re_{2}O_{7}+6HBr\ {\xrightarrow {}}\ ReO_{2}\downarrow +3Br_{2}+3H_{2}O}}

{\ displaystyle {\ mathsf {Re_ {2} O_ {7} + 6HBr \ {\ xrightarrow {}} \ ReO_ {2} \ downarrow + 3Br_ {2} + 3H_ {2} O}}}

Hydrogen Restored:

{\mathsf {Re_{2}O_{7}+7H_{2}\ {\xrightarrow {500^{o}C}}\ Re+7H_{2}O}}

{\ displaystyle {\ mathsf {Re_ {2} O_ {7} + 7H_ {2} \ {\ xrightarrow {500 ^ {o} C}} \ Re + 7H_ {2} O}}}

Disproportionate to rhenium:

{\mathsf {3Re_{2}O_{7}+Re\ {\xrightarrow {250-300^{o}C}}\ 7ReO_{3}}}

{\ displaystyle {\ mathsf {3Re_ {2} O_ {7} + Re \ {\ xrightarrow {250-300 ^ {o} C}} \ 7ReO_ {3}}}}

{\mathsf {2Re_{2}O_{7}+3Re\ {\xrightarrow {500-650^{o}C}}\ 7ReO_{2}}}

{\ displaystyle {\ mathsf {2Re_ {2} O_ {7} + 3Re \ {\ xrightarrow {500-650 ^ {o} C}} \ 7ReO_ {2}}}}

Reacts with carbon monoxide :

{\mathsf {Re_{2}O_{7}+17CO\ {\xrightarrow {250^{o}C,p}}\ Re_{2}(CO)_{10}+7CO_{2}}}

{\ displaystyle {\ mathsf {Re_ {2} O_ {7} + 17CO \ {\ xrightarrow {250 ^ {o} C, p}} \ Re_ {2} (CO) _ {10} + 7CO_ {2}} }}

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1995. - T. 4. - 639 p. - ISBN 5-82270-092-4 .
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Lidin R.A. and other Chemical properties of inorganic substances: Textbook. manual for universities. - 3rd ed., Rev. - M .: Chemistry, 2000 .-- 480 p. - ISBN 5-7245-1163-0 .
Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972. - T. 2. - 871 p.