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Iridium (III) oxide

Iridium (III) oxide is an inorganic compound, iridium metal oxide with the formula Ir 2 O 3 , blue-black crystals, insoluble in water.

Iridium oxide
Are common
Systematic
name		iridium (III) oxide
Traditional namesiridium oxide
Chem. formulaIr 2 O 3
Physical properties
conditionblue-black crystals
Molar mass432.44 g / mol
Thermal properties
T. melt.decomp. 400 ° C
Classification
Reg. CAS number
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider

Getting

  • The decomposition of alkali solutions of trivalent soluble salts of iridium:
Ir2(SOfour)3+6NaOH→Ir2O3↓+3Na2SOfour+3H2O{\ displaystyle {\ mathsf {Ir_ {2} (SO_ {4}) _ {3} + 6NaOH \ {\ xrightarrow {}} \ Ir_ {2} O_ {3} \ downarrow + 3Na_ {2} SO_ {4} + 3H_ {2} O}}} {\displaystyle {\mathsf {Ir_{2}(SO_{4})_{3}+6NaOH\ {\xrightarrow {}}\ Ir_{2}O_{3}\downarrow +3Na_{2}SO_{4}+3H_{2}O}}}
2IrCl3+6NaOH→Ir2O3↓+6NaCl+3H2O{\ displaystyle {\ mathsf {2IrCl_ {3} + 6NaOH \ {\ xrightarrow {}} \ Ir_ {2} O_ {3} \ downarrow + 6NaCl + 3H_ {2} O}}} {\displaystyle {\mathsf {2IrCl_{3}+6NaOH\ {\xrightarrow {}}\ Ir_{2}O_{3}\downarrow +6NaCl+3H_{2}O}}}

Physical Properties

Iridium (III) oxide forms blue-black crystals.

The dark green hydrate Ir 2 O 3 • n H 2 O crystallizes from the solution.

Not soluble in water, p PR = 47.70.

Chemical Properties

  • Decomposes on heating ( disproportionate ):
2Ir2O3→400-500oCIr+3IrO2{\ displaystyle {\ mathsf {2Ir_ {2} O_ {3} \ {\ xrightarrow {400-500 ^ {o} C}} \ Ir + 3IrO_ {2}}}} {\displaystyle {\mathsf {2Ir_{2}O_{3}\ {\xrightarrow {400-500^{o}C}}\ Ir+3IrO_{2}}}}
  • Anhydrous oxide is obtained by drying the hydrate:
Ir2O3⋅nH2O→300oCIr2O3+nH2O{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} \ cdot nH_ {2} O \ {\ xrightarrow {300 ^ {o} C}} \ Ir_ {2} O_ {3} + nH_ {2} O }}} {\displaystyle {\mathsf {Ir_{2}O_{3}\cdot nH_{2}O\ {\xrightarrow {300^{o}C}}\ Ir_{2}O_{3}+nH_{2}O}}}
  • Slowly soluble in concentrated hydrohalic acids :
Ir2O3+12HCl→τ2H3[IrCl6]+3H2O{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} + 12HCl \ {\ xrightarrow {\ tau}} \ 2H_ {3} [IrCl_ {6}] + 3H_ {2} O}}} {\displaystyle {\mathsf {Ir_{2}O_{3}+12HCl\ {\xrightarrow {\tau }}\ 2H_{3}[IrCl_{6}]+3H_{2}O}}}
  • In an inert atmosphere it dissolves in sulfuric acid :
Ir2O3+3H2SOfour→N2Ir2(SOfour)3+3H2O{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} + 3H_ {2} SO_ {4} \ {\ xrightarrow {N_ {2}}} \ Ir_ {2} (SO_ {4}) _ {3} + 3H_ {2} O}}} {\displaystyle {\mathsf {Ir_{2}O_{3}+3H_{2}SO_{4}\ {\xrightarrow {N_{2}}}\ Ir_{2}(SO_{4})_{3}+3H_{2}O}}}
  • It is oxidized by hot concentrated nitric acid :
Ir2O3+2HNO3→100oC2IrO2↓+2NO2↑+H2O{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} + 2HNO_ {3} \ {\ xrightarrow {100 ^ {o} C}} \ 2IrO_ {2} \ downarrow + 2NO_ {2} \ uparrow + H_ { 2} O}}}  
  • It is restored by hydrogen at room temperature:
Ir2O3+3H2→2Ir+3H2O{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} + 3H_ {2} \ {\ xrightarrow {}} \ 2Ir + 3H_ {2} O}}}  
  • Oxidized by oxygen when heated:
2Ir2O3+O2→600oCfourIrO2{\ displaystyle {\ mathsf {2Ir_ {2} O_ {3} + O_ {2} \ {\ xrightarrow {600 ^ {o} C}} \ 4IrO_ {2}}}}  

Literature

  • Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5 .
  • 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.



Source - https://ru.wikipedia.org/w/index.php?title= Oxidiridium ( III)&oldid = 68291532


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