Indium(III) sulfate

Last updated
Indium(III) sulfate
Names
Other names
Indium sulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.340 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 236-689-1
PubChem CID
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 Yes check.svgY
    Key: XGCKLPDYTQRDTR-UHFFFAOYSA-H Yes check.svgY
  • 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
Appearancewhite-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:
GHS-pictogram-exclam.svg
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)
[6]
NFPA 704.svgHealth 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 [7] (TWA), 0.3 [7] (STEL)
NIOSH (US health exposure limits):
PEL (Permissible)
0.1 [7]
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).
Yes check.svgY  verify  (what is  Yes check.svgYX mark.svgN ?)

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.

Contents

Properties

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

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

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]

Hydrogen sulfates

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

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

Two different types of anhydrous double indium sulfates have been made. One is from the family MI
3
MIII(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]

nameformulamolecular weighta Åc Åαvolume Å3density
trisodium indium trisulfateNa3In(SO4)3471.9713.9708.771109°00′4943.172
tripotassium indium trisulfateK3In(SO4)3520.3014.8628.960109°45′5713.026
trirubidium indium trisulfateRb3In(SO4)3659.4115.4139.136110°03′6263.498
tricesium indium trisulfateCs3In(SO4)3801.7216.0689.211110°36′6873.876
triammonium indium trisulfate(NH4)3In(SO4)3361.0615.5319.163120°1914.11.88
ammonium indium disulfateNH4In(SO4)2324.984.9028.70373.643171.273.15
rubidium indium disulfateRbIn(SO4)2392.414.9088.786273.781173.503.75
cesium indium disulfateCsIn(SO4)2439.854.9569.256774.473187.263.90
thallium indium disulfateTlIn(SO4)2511.334.9198.788273.748174.274.87

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

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.

formulaweighta Åb Åc Åβvolume Å3densityref
NH4In(SO4)2•4H2O397.0410.65110.7459.279102.67°1036.083.182 [37]
KIn(SO4)2•4H2O418.1010.58110.6419.224101.93°1016.13.416 [38]
RbIn(SO4)2•4H2O464.4710.65110.7459.279102.67°1036.13.722 [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

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

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

Monovalent

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

Philco surface-barrier transistor developed and produced in 1953 Philco Surface Barrier transistor=1953.jpg
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]

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Sulfuric acid or sulphuric acid, known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, and hydrogen, with the molecular formula H2SO4. It is a colorless, odorless, and viscous liquid that is miscible with water.

<span class="mw-page-title-main">Iron(II) sulfate</span> Chemical compound

Iron(II) sulfate (British English: iron(II) sulphate) or ferrous sulfate denotes a range of salts with the formula FeSO4·xH2O. These compounds exist most commonly as the heptahydrate (x = 7) but several values for x are known. The hydrated form is used medically to treat or prevent iron deficiency, and also for industrial applications. Known since ancient times as copperas and as green vitriol (vitriol is an archaic name for sulfate), the blue-green heptahydrate (hydrate with 7 molecules of water) is the most common form of this material. All the iron(II) sulfates dissolve in water to give the same aquo complex [Fe(H2O)6]2+, which has octahedral molecular geometry and is paramagnetic. The name copperas dates from times when the copper(II) sulfate was known as blue copperas, and perhaps in analogy, iron(II) and zinc sulfate were known respectively as green and white copperas.

<span class="mw-page-title-main">Copper(II) sulfate</span> Chemical compound

Copper(II) sulfate is an inorganic compound with the chemical formula CuSO4. It forms hydrates CuSO4·nH2O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright blue crystal, is the most commonly encountered hydrate of copper(II) sulfate, while its anhydrous form is white. Older names for the pentahydrate include blue vitriol, bluestone, vitriol of copper, and Roman vitriol. It exothermically dissolves in water to give the aquo complex [Cu(H2O)6]2+, which has octahedral molecular geometry. The structure of the solid pentahydrate reveals a polymeric structure wherein copper is again octahedral but bound to four water ligands. The Cu(II)(H2O)4 centers are interconnected by sulfate anions to form chains.

<span class="mw-page-title-main">Zinc sulfate</span> Chemical compound

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<span class="mw-page-title-main">Sodium sulfate</span> Chemical compound with formula Na2SO4

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<span class="mw-page-title-main">Cerium(IV) sulfate</span> Chemical compound

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<span class="mw-page-title-main">Double salt</span> Type of salt

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<span class="mw-page-title-main">Chromium(III) sulfate</span> Chemical compound

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<span class="mw-page-title-main">Calcium sulfite</span> Chemical compound

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<span class="mw-page-title-main">Cobalt(II) sulfate</span> Inorganic compound

Cobalt(II) sulfate is any of the inorganic compounds with the formula CoSO4(H2O)x. Usually cobalt sulfate refers to the hexa- or heptahydrates CoSO4.6H2O or CoSO4.7H2O, respectively. The heptahydrate is a red solid that is soluble in water and methanol. Since cobalt(II) has an odd number of electrons, its salts are paramagnetic.

<span class="mw-page-title-main">Ammonium iron(III) sulfate</span> Chemical compound

Ammonium iron(III) sulfate, NH4Fe(SO4)2·12 H2O, or NH4[Fe(H2O)6](SO4)2·6 H2O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO4)2 · 12 H2O. It has the appearance of weakly violet, octahedrical crystals. There has been some discussion regarding the origin of the crystals' color, with some ascribing it to impurities in the compound, and others claiming it to be a property of the crystal itself.

<span class="mw-page-title-main">Chrome alum</span> Chemical compound

Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO4)2 and it is commonly found in its dodecahydrate form as KCr(SO4)2·12(H2O). It is used in leather tanning.

<span class="mw-page-title-main">Chromium(II) sulfate</span> Chemical compound

Chromium(II) sulfate is an inorganic compound with the chemical formula CrSO4. It often comes as hydrates CrSO4·nH2O. Several hydrated salts are known. The pentahydrate CrSO4·5H2O is a blue solid that dissolves readily in water. Solutions of chromium(II) are easily oxidized by air to Cr(III) species. Solutions of Cr(II) are used as specialized reducing agents of value in organic synthesis.

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.

Gallium(III) sulfate refers to the chemical compound, a salt, with the formula Ga2(SO4)3, or its hydrates Ga2(SO4)3·xH2O. Gallium metal dissolves in sulfuric acid to form solutions containing [Ga(OH2)6]3+ and SO42− ions. The octadecahydrate Ga2(SO4)3·18H2O crystallises from these solutions at room temperature. This hydrate loses water in stages when heated, forming the anhydrate Ga2(SO4)3 above 150 °C and completely above 310 °C. Anhydrous Ga2(SO4)3 is isostructural with iron(III) sulfate, crystallizing in the rhombohedral space group R3.

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