Iridium(II) chloride

Iridium(II) chloride
Names
	Other names Iridium dichloride, iridium bichloride
Identifiers
CAS Number	13465-17-3 ;
3D model ( JSmol )	Interactive image ;
	InChI InChI=1S/2ClH.Ir/h2*1H;/q;;+2/p-2 Key: BBVIQHLJRNEBBW-UHFFFAOYSA-L ;
	SMILES [Ir+2].[Cl-].[Cl-] ;
Properties
Chemical formula	Cl 2 Ir
Molar mass	263.12 g·mol ?1
Appearance	dark-green crystals
Melting point	773 °C (1,423 °F; 1,046 K)
Solubility in water	Practically insoluble
Related compounds
Related compounds	Osmium(II) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iridium(II) chloride is an inorganic chemical compound of iridium metal and chlorine with the chemical formula IrCl ₂. ^[1]^[2] This is a metal salt of iridium and hydrochloric acid .

Synthesis [ edit ]

The substance is obtained by the interaction of powdered metallic iridium with chlorine gas when heated: ^[3]^[4]

Ir + Cl ₂ → IrCl ₂

Iridium(II) chloride can also be made in a reaction between iridium(III) chloride and metallic iridium:

2IrCl ₃ + Ir → 3IrCl ₂

Physical properties [ edit ]

Iridium dichloride forms shiny dark-green crystals that are practically insoluble in water. ^[5] Poorly soluble in acids and alkali. When heated to 773 °C, IrCl ₂ decomposes without melting.

The standard Gibbs energy of the formation of ΔG (298 K, kJ/mol) is -139.7.

Chemical properties [ edit ]

When heated to 773 °C decomposes according to the equation: ^[6]

2IrCl ₂ → 2IrCl + Cl ₂

At temperatures above 798 °C, complete decomposition of the substance occurs:

IrCl ₂ → Ir + Cl ₂

References [ edit ]

^ Regnault, Victor (1853). Elements of Chemistry: For the Use of Colleges, Academies, and Schools . Clark & Hesser. p. 355 . Retrieved 31 March 2023 .
^ Kandiner, H. J. (3 September 2013). Iridium (in German). Springer-Verlag . p. 55. ISBN 978-3-662-12128-3 . Retrieved 31 March 2023 .
^ Cooley, Arnold James (1880). A cyclopædia of practical receipts . p. 906 . Retrieved 31 March 2023 .
^ Watts, Henry (1875). A Dictionary of Chemistry and the Allied Branches of Other Sciences . Longmans, Green, and Company. p. 318 . Retrieved 31 March 2023 .
^ Friend, John Newton (1922). Cobalt, Nickel, and the Elements of the Platinum Group . Griffin. p. 243 . Retrieved 31 March 2023 .
^ Satya, Prakash (2013). Advanced Chemistry of Rare Elements . S. Chand Publishing. p. 629. ISBN 978-81-219-4254-6 . Retrieved 31 March 2023 .

[1] Regnault, Victor (1853). Elements of Chemistry: For the Use of Colleges, Academies, and Schools . Clark & Hesser. p. 355 . Retrieved 31 March 2023 .

[2] Kandiner, H. J. (3 September 2013). Iridium (in German). Springer-Verlag . p. 55. ISBN 978-3-662-12128-3 . Retrieved 31 March 2023 .

[3] Cooley, Arnold James (1880). A cyclopædia of practical receipts . p. 906 . Retrieved 31 March 2023 .

[4] Watts, Henry (1875). A Dictionary of Chemistry and the Allied Branches of Other Sciences . Longmans, Green, and Company. p. 318 . Retrieved 31 March 2023 .

[5] Friend, John Newton (1922). Cobalt, Nickel, and the Elements of the Platinum Group . Griffin. p. 243 . Retrieved 31 March 2023 .

[6] Satya, Prakash (2013). Advanced Chemistry of Rare Elements . S. Chand Publishing. p. 629. ISBN 978-81-219-4254-6 . Retrieved 31 March 2023 .

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