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Indium(III) sulfate

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Indium(III) sulfate (In2(SO4)3) is a sulfate salt of the metal indium. It is a sesquisulfate, meaning that the sulfate group occurs 1⁠1/2⁠ times as much as the metal. It may be formed by the reaction of indium, its oxide, or its carbonate with sulfuric acid. An excess of strong acid is required, otherwise insoluble basic salts are formed.[8] As a solid indium sulfate can be anhydrous, or take the form of a pentahydrate with five water molecules[9] or a nonahydrate with nine molecules of water. Indium sulfate is used in the production of indium or indium containing substances. Indium sulfate also can be found in basic salts, acidic salts or double salts including indium alum.

Indium(III) sulfate
Names
Other names
Indium sulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.340 Edit this at Wikidata
EC Number
  • 236-689-1
RTECS number
  • NL1925000
UNII
  • InChI=1S/2In.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6 checkY
    Key: XGCKLPDYTQRDTR-UHFFFAOYSA-H checkY
  • InChI=1/2In.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6
    Key: XGCKLPDYTQRDTR-CYFPFDDLAA
  • [In+3].[In+3].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O
Properties
In2(SO4)3
Molar mass 517.81 g/mol
Appearance white-gray odorless powder, hygroscopic, monoclinic crystals
Density 3.44 g/cm3, solid
Melting point decomposes at 600 °C[1]
soluble, (539.2 g/L at 20 °C)[2]
Structure
monoclinic (room temperature)
P121
a = 8.57 Å[3], b = 8.908 Å, c = 14.66 Å
α = 90°, β = 124.72°, γ = 90°
Structure
rhombohedral
R-3
a = 8.44 Å[3][4], b = 8.44 Å, c = 23.093 Å
α = 90°, β = 90°, γ = 120°
6 formula per cell
Thermochemistry
0.129[5]
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)
[7]
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
0.1[6] (TWA), 0.3[6] (STEL)
NIOSH (US health exposure limits):
PEL (Permissible)
 0.1[6]
Safety data sheet (SDS) tttmetalpowder
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Properties

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In water solution, the indium ion forms a complex with water and sulfate, examples being In(H2O)5(SO4)+ and In(H2O)4(SO4)2−.[10][11] Indium is unusual in forming a sulfate complex. The effect on the sulfate ion is revealed in the Raman spectrum.[8] The proportion of sulfate complex increases with temperature showing the reaction that forms it is endothermic. The proportion also increases with concentration of the solution and can be over a half.[12] The sulfate complex rapidly exchanges with water at a rate of over 10,000,000 per second, so that NMR cannot detect the difference that results from a complexed and noncomplexed indium ion.[12] An indium sulfate water solution is quite acidic with a 0.14 mol/liter solution having a pH of 1.85. If the pH rises above 3.4 then a precipitate will form.[13]

The Raman spectrum of the solution shows lines at 650, 1000 and 1125 cm−1 due to a sulfur–oxygen bonds in sulfate bound to indium. A line at 255 cm−1 is due to the indium-oxygen bond to the sulfate. The water attached to the indium atom causes a band at about 400 cm−1.[8]

Solid anhydrous indium sulfate has two crystalline forms. When formed by chlorine gas chemical transport at 848 K, it has a monoclinic form with unit cell dimensions a = 8.570 Å, b = 8.908 Å and c = 12.0521 Å, β = 91.05°, and four formulae per cell. A high temperature form deposited at 973K has a hexagonal (or rhombohedral) form with cell dimensions of a = 8.440 Å, c = 23.093 Å and six formulae per cell.[14]

During extraction of indium, a sulfate solution of mixed metals, including indium sulfate, has trivalent metals partitioned into a kerosene solution of di-2-ethylhexyl hydrogen phosphate. Isododecylphosphetanic and diisooctylphosphinic acids can also be used for this function. The kerosene mixture is then backwashed with an acid to recover the metals in a water solution and regenerate the extracting fluid.[15]

Production

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Indium metal reacts with cold concentrated sulfuric acid to produce Indium sulfate and hydrogen gas. If hot concentrated sulfuric acid is used indium will reduce the sulfuric acid to sulfur dioxide.[16]

Indium sulfate can also be produced from a reaction of sulfuric acid on indium oxide, indium carbonate, or indium hydroxide.

Reactions

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When heated to 710 K (437 °C) or above, indium sulfate decomposes by giving off sulfur trioxide vapour, yielding indium oxide.[17]

 

Alkalis added to indium sulfate solutions precipitate basic salts. For example, potassium hydroxide produces either a basic sulfate, 2In2O3.SO3·nH2O, or KIn3(OH)6(SO4)2 depending on pH.[18] Sodium pyrophosphate causes a slimy precipitate of indium pyrophosphate, In4(P2O7)3·3H2O. Potassium periodate causes a precipitate of a basic indium periodate, 2InO5·In(OH)3·6H2O .[19] Oxalic acid causes a precipitate of indium oxalate, In2(C2O4)3·10H2O. Alkali oxalates cause a precipitate of the alkali dioxalatoindate to form MIn(C2O4)2·3H2O, where M = Na, K or NH4.[20]

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Hydrogen sulfates

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An acid sulfate, indium hydrogensulfate tetrahydrate with the formula HIn(SO4)2·4H2O crystallises in the orthorhombic system with unit cell dimensions a = 9.997 Å, b = 5.477 Å, c = 18.44 Å, with four of the formula per cell. The density is 2.50 cm−3. In the acid sulfate, two water molecules are linked to the indium atom and a hydronium ion H5O2 takes care of the proton. This is part of an acid sulfate family that includes Al, Ga, In, Tl(III), Fe(III) and Ti(III). HIn(SO4)2 is made by evaporating an indium sulfate in 40% sulfuric acid solution[21] or cooling indium sulfate in a 60% sulfuric acid solution.[22] As the acid tetrahydrate is heated it gives off water yielding a trihydrate, monohydrate, and an anhydrous form at 370, 385 and 482K. Above 505K it gives out more water and sulfur dioxide yielding the neutral indium sulfate.[22] Indium hydrogensulfate is a proton conductor with conductivity 0.0002Ω−1cm−1.[22]

Basic sulfates

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A basic indium sulfate is made by adding ethanol to a water solution of indium sulfate. Crystals can be formed by using a 0.05 molar solution with twice the volume of ethanol, and waiting for several weeks for crystals to form.[23] InOHSO4·(H2O)2 has monoclinic crystals with a=6.06 Å b=7.89 Å c=12.66 Å and β=107.5°. Cell volume is 577.6 Å3.[23] Another basic indium sulfate InOHSO4 with rhombohedral crystals is made by heating an indium sulfate solution at 160 °C or over for about a week in a sealed tube.[24] This insoluble basic salt also forms if indium sulfate solution is diluted below 0.005 molar. So a precipitate forms from diluted solutions as well as from heated solutions.[12]

Anhydrous double sulfates

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Two different types of anhydrous double indium sulfates have been made. One is from the family MI
3MIII(XO4)3, with MI being a large singly positive ion such as K, Rb, Cs, Tl or NH3; MIII is triply charged and can be Al, Ga, In, Tl, V, Cr, Fe, Sc and other rare earths; and X is S or Se.[25] Most of these have a rhombohedral crystal structure. However, triammonium indium trisulfate, (NH4)3In(SO4)3 converts from rhombohedral to monoclinic as the temperature drops below 80 °C, and converts back into a rhombohedral form with space group R3c as the temperature rises above 110 °C.[25] The low temperature monoclinic form has space group P21/c, a=8.96, b=15.64 c=9.13 β=108.28° Z=4[25] The high temperature form is termed "β-". An explanation for this transition is that ammonium (and also thallium) is a non-spherical ion and thus has lower symmetry. However, when it is heated enough, dynamical disorder causing random orientations makes the ions on average spherically symmetric. Alkali metal ions are spherical in shape at all temperatures and form rhombohedral structures.[25] Double sulfates of this form exist of indium with the alkali metals sodium, potassium, rubidium, and cesium. These can be formed by heating a solid mixture of the individual sulfates to 350 °C.[9]

name formula molecular weight a Å c Å α volume Å3 density
trisodium indium trisulfate Na3In(SO4)3 471.97 13.970 8.771 109°00′ 494 3.172
tripotassium indium trisulfate K3In(SO4)3 520.30 14.862 8.960 109°45′ 571 3.026
trirubidium indium trisulfate Rb3In(SO4)3 659.41 15.413 9.136 110°03′ 626 3.498
tricesium indium trisulfate Cs3In(SO4)3 801.72 16.068 9.211 110°36′ 687 3.876
triammonium indium trisulfate (NH4)3In(SO4)3 361.06 15.531 9.163 120° 1914.1 1.88
ammonium indium disulfate NH4In(SO4)2 324.98 4.902 8.703 73.643 171.27 3.15
rubidium indium disulfate RbIn(SO4)2 392.41 4.908 8.7862 73.781 173.50 3.75
cesium indium disulfate CsIn(SO4)2 439.85 4.956 9.2567 74.473 187.26 3.90
thallium indium disulfate TlIn(SO4)2 511.33 4.919 8.7882 73.748 174.27 4.87

Another series of anhydrous rhombohedral double salts in the same series of TlFe(SO4)2 exists. These can be made by heating a mixture of anhydrous sulfates at 350 °C, or by dehydrating hydrous double alum type salts at 300 °C. The substances in this series are RbIn(SO4)2, CsIn(SO4)2, TlIn(SO4)2 and NH4In(SO4)2. Although KIn(SO4)2 exists it has a different crystalline form.[26]

Hydrated double sulfates

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Hydrated double salts of indium in an alum structure exist with formula MIIn(SO4)2·12H2O. All alums have a cubic crystal structure with space group Pa3.[27] The indium cesium alum CsIn(SO4)2•12H2O[12] has formula weight 656.0, unit cell width 12.54 Å, cell volume 1972 Å3 and density 2.20 g/cm3.[27] It has the β alum structure.[28] The cesium alum can be used in the analysis of indium. It precipitates when cesium nitrate is added to indium sulfate solution with extra sulfuric acid added.[29]

Indium ammonium alum NH4In(SO4)2·12H2O[30] is fairly unstable at room temperature and must be crystallised below 5 °C.[31] It decomposes at 36 °C to a tetrahydrate.[32] It changes to a ferroelectric phase below 127K.[33] The alum methyl ammonium indium sulfate dodecahydrate CH3NH3In(SO4)2·12H2O becomes ferroelectric below 164K.[34] Potassium indium alum has not been crystallised.[35] Rubidum indium alum is highly efflorescent very easily losing its water.[36]

Another series of monoclinic hydrated double salts have four water molecules MIn(SO4)2·4H2O, with five formulae per unit cell, where M is NH4, K or Rb and the point group is P21/c. The prototype substance for the series is (NH4)Sm(SO4)2(H2O)4.

formula weight a Å b Å c Å β volume Å3 density ref
NH4In(SO4)2•4H2O 397.04 10.651 10.745 9.279 102.67° 1036.08 3.182 [37]
KIn(SO4)2•4H2O 418.10 10.581 10.641 9.224 101.93° 1016.1 3.416 [38]
RbIn(SO4)2•4H2O 464.47 10.651 10.745 9.279 102.67° 1036.1 3.722 [39]

Cadmium can also form a double sulfate, Cd3In2(SO4)6·26H2O.[40]

Crystals with less water also exist like KIn(SO4)2·H2O.[41]

Organic double sulfates

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Organic base double sulfates of indium include the guanidinium salt [C(NH2)3][In(H2O)2(SO4)2], which crystallises in a monoclinic system with space group P21/c a = 4.769 Å, b = 20.416 Å, c = 10.445 Å, β = 93.39°, cell volume 1015.3 Å3, 4 formulas per cell and density 2.637. [H2(4,4'-bi-py)][In2(H2O)6(SO4)4]·2H2O crystallises in the triclinic system with a = 7.143 Å, b = 7.798 Å, c = 12.580 Å, α = 107.61°, β = 98.79°, γ = 93.89°, cell volume 655.2 Å3, one formula per cell and density 2.322.[42] [H(2,2'-bipy)][In(H2O)(SO4)2]·2H2O, the hexamethylenediamine salt [H3N(CH2)6NH3][In(H2O)2(SO4)2]2·2H2O and [H2(Py(CH2)3Py)][In(H2O)2(SO4)2]2·2H2O also exist.[42] Yet other organic derivatives include those of triethylenetetramine,[43] and amylammonium.[30] Tri-μ-sulfato-κ6O:O'-bis[aqua(1,10-phenanthroline-κ2N,N')indium(III)] dihydrate, [In2(SO4)3(C12H8N2)2(H2O)2]·2H2O, has a 1,10-phenanthroline molecule linked to each indium ion. Two indium ions are linked via three sulfate groups. It forms triclinic crystals with two formulas per unit cell. The density is 2.097 g/cm3.[44]

Dimethylindium sulfate [(CH3)2In]2SO4 can be made by reacting trimethylindium with dry sulfuric acid.[45]

Mixed

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A double indium sulfate chloride salt has formula In2(SO4)3·InCl3·(17±1)H2O.[46]

Monovalent

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Indium(I) sulfate, In2SO4 can be made in a solid state by heating indium metal with indium(III) sulfate,[47] but when dissolving in water or sulfuric acid, In+ reacts to produce hydrogen gas.[48] The mixed valence salt InIInIII(SO4)2 is also made by heating indium metal with indium(III) sulfate.[49]

Use

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Philco surface-barrier transistor developed and produced in 1953

Indium sulfate is a commercially available chemical. It can be used to electroplate indium metal,[50] as a hardening agent in gold electroplating[51] or to prepare other indium containing substances such as copper indium selenide. It has been sold as a health supplement, even though there is no evidence of benefit to humans, and it is toxic.[52]

The first high-frequency transistor was the surface-barrier germanium transistor developed by Philco in 1953, capable of operating up to 60 MHz.[53] These were made by etching depressions into an N-type germanium base from both sides with jets of indium sulfate until it was a few ten-thousandths of an inch thick. Indium electroplated into the depressions formed the collector and emitter.[54][55]

References

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  2. ^ Indium Sulfate. Product Data Sheet Archived 10 February 2012 at the Wayback Machine Indium Cooperation
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