Indium(III) nitrate

Indium(III) nitrate is a nitrate salt of indium which forms various hydrates. Only the pentahydrate has been crystallographically verified. Other hydrates are also reported in literature, such as the trihydrate.^[1][2][3]

Indium(III) nitrate

Identifiers
CAS Number	anhydrous: 13770-61-1 Y monohydrate: 13465-14-0 trihydrate: 15650-88-1
3D model (JSmol)	anhydrous: Interactive image monohydrate: Interactive image trihydrate: Interactive image tetrahydrate: Interactive image
ChemSpider	anhydrous: 24472 monohydrate: 2341257 trihydrate: 26948018
ECHA InfoCard	100.033.979
EC Number	anhydrous: 237-393-5
PubChem CID	anhydrous: 26265 monohydrate: 3084148 trihydrate: 91886655 tetrahydrate: 138753438 pentahydrate: 22446589
RTECS number	anhydrous: NL1750000
UNII	anhydrous: WOP84073FA Y
CompTox Dashboard (EPA)	anhydrous: DTXSID7065621
InChI InChI=1S/In.3NO3/c;3*2-1(3)4/q+3;3*-1 Key: LKRFCKCBYVZXTC-UHFFFAOYSA-N monohydrate: InChI=1S/In.3NO3.H2O/c;3*2-1(3)4;/h;;;;1H2/q+3;3*-1; Key: YZZFBYAKINKKFM-UHFFFAOYSA-N trihydrate: InChI=1S/In.3NO3.3H2O/c;3*2-1(3)4;;;/h;;;;3*1H2/q+3;3*-1;;; Key: HVDZMISZAKTZFP-UHFFFAOYSA-N tetrahydrate: InChI=1S/In.3NO3.4H2O/c;3*2-1(3)4;;;;/h;;;;4*1H2/q+3;3*-1;;;; Key: ZYYDOSLSINDXIQ-UHFFFAOYSA-N
SMILES anhydrous: [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[In+3] monohydrate: [N+](=O)([O-])O[In](O[N+](=O)[O-])O[N+](=O)[O-].O trihydrate: [N+](=O)([O-])O[In](O[N+](=O)[O-])O[N+](=O)[O-].O.O.O tetrahydrate: [N+](=O)([O-])O[In](O[N+](=O)[O-])O[N+](=O)[O-].O.O.O.O
Properties
Chemical formula	In(NO3)3
Molar mass	300.83 g/mol
Appearance	White solid
Density	2.43 g/cm3 (pentahydrate)[1]
Melting point	100 °C (212 °F; 373 K) (decomposes, hydrate)
Solubility in water	Soluble
Structure[1]
Crystal structure	Monoclinic
Space group	C2/c
Lattice constant	a = 10.35 Å, b = 9.17 Å, c = 11.25 Å α = 90°, β = 91.05°, γ = 90°
Lattice volume (V)	1068 Å3
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Production and reactions

Indium(III) nitrate hydrate is produced by the dissolution of indium metal in concentrated nitric acid followed by evaporation of the solution:^[1][2][3]

In + 4 HNO₃ → In(NO₃)₃ + NO + 2 H₂O

The hydrate first decomposes to a basic salt and then to indium(III) oxide at 240 °C. Anhydrous indium(III) nitrate is claimed to be produced by the reaction of anhydrous indium(III) chloride and dinitrogen pentoxide.^[2][4]

In the presence of excess nitrate ions, indium(III) nitrate converts to the [In(NO₃)₄]⁻ ion.^[1][2]

The hydrolysis of indium(III) nitrate yields indium(III) hydroxide. It also reacts with sodium tungstate to form In(OH)WO₄, [In(OH)₂]₂WO₄, NaInWO₄ or In₂(WO₄)₃ depending on pH.^[5][6]

Structure

Only the pentahydrate has been structurally elucidated. The pentahydrate consists of octahedral [In(NO₃)(H₂O)₅]²⁺ centers as well as two nitrates and is monoclinic.^[1]