Rhenium Fluoride (VII)

Rhenium fluoride
Rhenium fluoride
Are common
Systematic ; name	Rhenium Fluoride (VII)
Traditional names	rhenium fluoride,; rhenium heptafluoride
Chem. formula	ReF 7
Physical properties
condition	yellow crystals
Molar mass	319.19 g / mol
Density	3.65 g / cm³
Thermal properties
T. melt.	48.3 ° C
T. bale.	73.3; 73.7 ° C
Like heat resistant.	132.4 J / (mol · K)
Enthalpy of Education	-1412 kJ / mol
Classification
Reg. CAS number	17029-21-9
PubChem
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ChemSpider

Rhenium (VII) fluoride is an inorganic compound, a salt of rhenium metal and hydrofluoric acid with the formula ReF ₇ , very fusible yellow crystals, reacts with water, corrodes glass in the molten state.

Getting

When rhenium and fluorine powder is heated at atmospheric pressure and a temperature of 600–700 ° C, a mixture of rhenium hexafluoride and rhenium heptafluoride is formed:

{\mathsf {Re+3F_{2}\ {\xrightarrow {}}\ ReF_{6}}}

{\ displaystyle {\ mathsf {Re + 3F_ {2} \ {\ xrightarrow {}} \ ReF_ {6}}}}

{\mathsf {2Re+7F_{2}\ {\xrightarrow {}}\ 2ReF_{7}}}

{\ displaystyle {\ mathsf {2Re + 7F_ {2} \ {\ xrightarrow {}} \ 2ReF_ {7}}}}

When heated, the resulting mixture or rhenium powder (400 ° C) at high pressure in a fluorine atmosphere produces pure ReF ₇ ^[1] :

{\mathsf {2ReF_{6}+F_{2}\ {\xrightarrow {\ }}2ReF_{7}}}

{\ displaystyle {\ mathsf {2ReF_ {6} + F_ {2} \ {\ xrightarrow {\}} 2ReF_ {7}}}}

.

Physical Properties

Rhenium (VII) fluoride - forms yellow crystals of cubic syngony , cell parameters a = 0.626 nm.

Chemical Properties

Reacts with water:

{\mathsf {ReF_{7}+4H_{2}O\ {\xrightarrow {}}\ HReO_{4}+7HF}}

{\ displaystyle {\ mathsf {ReF_ {7} + 4H_ {2} O \ {\ xrightarrow {}} \ HReO_ {4} + 7HF}}}

Reacts with diluted alkalis :

{\mathsf {ReF_{7}+8NaOH\ {\xrightarrow {}}\ NaReO_{4}+7NaF+4H_{2}O}}

{\ displaystyle {\ mathsf {ReF_ {7} + 8NaOH \ {\ xrightarrow {}} \ NaReO_ {4} + 7NaF + 4H_ {2} O}}}

Hydrogen Restored:

{\mathsf {2ReF_{7}+3H_{2}\ {\xrightarrow {200^{o}C}}\ 2ReF_{4}+6HF}}

{\ displaystyle {\ mathsf {2ReF_ {7} + 3H_ {2} \ {\ xrightarrow {200 ^ {o} C}} \ 2ReF_ {4} + 6HF}}}

Reacts with silica :

{\mathsf {2ReF_{7}+3SiO_{2}\ {\xrightarrow {50-70^{o}C}}\ 2ReO_{3}F+3SiF_{4}}}

{\ displaystyle {\ mathsf {2ReF_ {7} + 3SiO_ {2} \ {\ xrightarrow {50-70 ^ {o} C}} \ 2ReO_ {3} F + 3SiF_ {4}}}}

It forms fluorocomplexes with alkali metal fluorides:

{\mathsf {ReF_{7}+KF\ {\xrightarrow {}}\ K[ReF_{8}]}}

{\ displaystyle {\ mathsf {ReF_ {7} + KF \ {\ xrightarrow {}} \ K [ReF_ {8}]}}}

Notes

↑ Reaction of rhenium with air

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1995. - T. 4. - 639 p. - ISBN 5-82270-092-4 .
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.

[1] Reaction of rhenium with air