Sulfite sulfate

A sulfite sulfate is a chemical compound that contains both sulfite and sulfate anions [SO3]2− [SO4]2−. These compounds were discovered in the 1980s as calcium and rare earth element salts. Minerals in this class were later discovered. Minerals may have sulfite as an essential component, or have it substituted for another anion as in alloriite.[1] The related ions [O3SOSO2]2− and [(O2SO)2SO2]2− may be produced in a reaction between sulfur dioxide and sulfate and exist in the solid form as tetramethyl ammonium salts. They have a significant partial pressure of sulfur dioxide.[2]

Related compounds are selenate selenites and tellurate tellurites with a varying chalcogen. They can be classed as mixed valent compounds.

Production

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Europium and cerium rare earth sulfite sulfates are produced when heating the metal sulfite trihydrate in air.

Ce2(SO3)3.3H2O + 1⁄2O2 → Ce2(SO3)2SO4 + 3H2O

Ce2(SO3)3.3H2O + O2 → Ce2SO3(SO4)2 + 3H2O

Other rare earth sulfite sulfates can be crystallized as hydrates from a water solution.[3] These sulfite sulfates can be made by at least three methods. One is to dissolve a rare earth oxosulfate in water and then bubble in sulfur dioxide. The second way a rare earth oxide is dissolved in a half equivalent of sulfuric acid. The third way was to bubble sulfur dioxide through a suspension of rare earth oxide in water until it dissolved, then let it sit around for a few days with limited air exposure. To make calcium sulfite sulfate, a soluble calcium salt is added to a mixed solution of sodium sulfite and sodium sulfate.[4]

Control of pH is important when attempting to produce solid sulfite compounds. In basic conditions sulfite easily oxidises to sulfate and in acidic conditions it easily turns into sulfur dioxide.[5]

Properties

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In the sulfite sulfates, sulfur has both a +4 and a +6 oxidation state.[6]

The crystal structure of sulfite sulfates has been difficult to study, as the crystal symmetry is low, crystals are usually microscopic as they are quite insoluble, and they are mixed with other related phases. So they have been studied via powder X-ray diffraction.[4]

Reactions

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When heated in the absence of oxygen, cerium sulfite sulfate hydrate parts with water by 400 °C. Up to 800° it loses some sulfur dioxide. From 800° to 850 °C it loses sulfur dioxide and disulfur resulting in cerium oxy disulfate, and dioxy sulfate, which loses some further sulfur dioxide as it is heated to 1000 °C. Over 1000° the remaining oxysulfates decompose to sulfur dioxide, oxygen and cerium dioxide. This reaction is studied as a way to convert sulfur dioxide into sulfur and oxygen using only heat.[7][8]

Another thermochemical reaction for cerium sulfite sulfate hydrate involves using iodine to oxidise the sulfite to sulfate, producing hydrogen iodide which can then be used to make hydrogen gas and iodine. When combined with the previous high temperature process, water can be split into oxygen and hydrogen using heat only.[9][10] This is termed the GA sulfur-iodine water splitting cycle.[11]

Applications

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Calcium sulfite sulfate hydrate is formed in flue gas scrubbers that attempt to remove sulfur dioxide from coal burning facilities. Calcium sulfite sulfate hydrate is also formed in the weathering of limestone, concrete and mortar by sulfur dioxide polluted air. These two would be classed as anthropogenic production as it was not deliberately produced or used.

List

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name formula ratio

SO3:SO4

mw system space group unit cell volume density optical references
tricalcium disulfite sulfate dodecahydrate

Orschallite

Ca3(SO3)2SO4•12H2O 2:1 rhombohedral R3c a=11.3514 c=28.412

a = 11.350 c = 28.321 Z=6

3170

3159.7

1.87 Uniaxial (+)

nω = 1.4941 nɛ = 1.4960

[12][13][14]
Hielscherite Ca3Si(OH)6(SO4)(SO3)·11H2O 1:1 hexagonal P63 a = 11.1178 c = 10.5381 Z=2 1128.06 1.82 Uniaxial (−)

nω = 1.494 nε = 1.476

[15]
pentamanganese tetrahydroxide disulfite disulfate dihydrate Mn5(OH)4(H2O)2[SO3]2[SO4] 2:1 634.9 monoclinic P21/m a = 7.6117 b = 8.5326 c = 10.9273 β = 101.600° Z = 2 695.2 3.0321 pink [16]
Y2(SO3)2SO4•2.5H2O 2:1 [4]
Barium sulfite sulfate3,7 Ba(SO3)0.3(SO4)0.7 2:7 orthorhombic Pnma a=8.766 b=5.46 c=7.126 [17]
lanthanum disulfite sulfate tetrahydrate La2(SO3)2SO4•4H2O 2:1 [4]
cerium disulfite sulfate Ce2(SO3)2SO4 2:1 [3]
cerium disulfite sulfate tetrahydrate Ce2(SO3)2SO4•4H2O 2:1 [7][18]
cerium sulfite disulfate Ce2SO3(SO4)2 1:2 [3]
neodymium disulfite sulfate tetrahydrate Nd2(SO3)2SO4•4H2O 2:1 [4]
Nd(SO3)(HSO4)(H2O)3 1:1 374.41 triclinic P1 a=6.5904 b=6.9899 c=9.536 α=101.206 β=97.767

γ=92.823 Z=2

425.67 2.921 light violet [5]
Nd(SO3)(HSO4) 1:1 triclinic P1 a=6.4152 b=6.6232 c=6.9955 α=91.726 β=92.438

γ=92.423 Z=2

296.55 3.610 light violet [5]
ethylenediammonium bis-(neodymium sulfite sulfate hydrate) C2H10N2[Nd(SO3)(SO4)H2O]2 1:1 738.87 monoclinic P21/c a=9.0880 b=6.9429 c=13.0805 β=91.55 Z=2 825.04 2.974 pink [19][20]
Sm2(SO3)2SO4•2.5H2O 2:1 [21]
europium disulfite sulfate Eu2(SO3)2SO4 2:1 [3]
europium sulfite disulfate Eu2SO3(SO4)2 1:2 [3]
Tb2(SO3)2SO4•2.5H2O 2:1 [4]
poly[diaqua-μ(4)-sulfato-di-μ(4)-sulfito-didysprosium(III)] Dy2(SO3)2SO4•2H2O 2:1 617.21 monoclinic C2/c a = 11.736 b = 6.8010 c = 12.793 β = 102.686° Z=4 996.1 4.115 colourless [4][22]
Ho2(SO3)2SO4•2.5H2O 2:1 [4]
Er2(SO3)2SO4•2.5H2O 2:1 [4]
Yb2(SO3)2SO4•2.5H2O 2:1 [4]
Complexes
[OsO2(SO3)(SO4)(NH3)2]2− 1:1 [23]

References

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  2. ^ Richardson, Stephanie (2009). "Capture of Sulfur Dioxide using Sulfur Oxydianions: Synthesis and Characterization of Two Novel Compounds" (PDF). Retrieved 24 June 2020.
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  13. ^ Weidenthaler, C.; Tillmanns, E.; Hentschel, G. (1993). "Orschallite, Ca3(SO3)2 . SO4 . 12H2O, a new calcium-sulfite-sulfate-hydrate mineral". Mineralogy and Petrology. 48 (2–4): 167–177. doi:10.1007/BF01163095. ISSN 0930-0708. S2CID 93169523.
  14. ^ Zangen, Mendel; Cohen, Abraham (5 June 1985). "STUDIES ON ALKALINE EARTH SULFITES. VII. HYDROGEN BONDING AND THE LOCATION OF HYDROGEN ATOMS IN THE CRYSTAL STRUCTURE OF CaSO3·4H2O AND Ca3(SO3)2SO4 ·12H2O". Chemistry Letters. 14 (6): 797–800. doi:10.1246/cl.1985.797.
  15. ^ Pekov, I. V.; Chukanov, N. V.; Britvin, S. N.; Kabalov, Y. K.; Göttlicher, J.; Yapaskurt, V. O.; Zadov, A. E.; Krivovichev, S. V.; Schüller, W.; Ternes, B. (October 2012). "The sulfite anion in ettringite-group minerals: a new mineral species hielscherite, Ca 3 Si(OH) 6 (SO 4 )(SO 3 )·11H 2 O, and the thaumasite–hielscherite solid-solution series". Mineralogical Magazine. 76 (5): 1133–1152. Bibcode:2012MinM...76.1133P. doi:10.1180/minmag.2012.076.5.06. ISSN 0026-461X. S2CID 101147914.
  16. ^ Ben Yahia, Hamdi; Shikano, Masahiro; Kobayashi, Hironori (2013). "Single crystal growth of the novel Mn2(OH)2SO3, Mn2F(OH)SO3, and Mn5(OH)4(H2O)2[SO3]2[SO4] compounds using a hydrothermal method". Dalton Transactions. 42 (19): 7158–66. doi:10.1039/c3dt50415h. ISSN 1477-9226. PMID 23525185.
  17. ^ Buchmeier, Willi; Engelen, Bernward; Lutz, Heinz Dieter (1988-01-01). "Kristallstruktur von Bariumsulfitsulfat, Ba(SO3)0,3(SO4)0,7 bzw. BaSO3,7". Zeitschrift für Kristallographie – Crystalline Materials. 183 (1–4): 43–50. doi:10.1524/zkri.1988.183.14.43. ISSN 2196-7105. S2CID 101933384.
  18. ^ Peterson, E. J.; Foltyn, E. M.; Onstott, E. I. (1980), McCarthy, Gregory J.; Rhyne, James J.; Silber, Herbert B. (eds.), "Preparation and Thermal Studies of a Cerium (III) Sulfite-Sulfate-Hydrate", The Rare Earths in Modern Science and Technology, Boston, MA: Springer US, pp. 65–66, doi:10.1007/978-1-4613-3054-7_11, ISBN 978-1-4613-3056-1
  19. ^ Rao, Chintamani Nagesa Ramachandra (2008). Trends in Chemistry of Materials: Selected Research Papers of C.N.R. Rao. World Scientific. pp. 382–388. ISBN 978-981-283-383-9.
  20. ^ Rao, K. Prabhakara; Rao, C. N. R. (April 2007). "Coordination Polymers and Hybrid Networks of Different Dimensionalities Formed by Metal Sulfites". Inorganic Chemistry. 46 (7): 2511–2518. doi:10.1021/ic061988m. ISSN 0020-1669. PMID 17326625.
  21. ^ Leskelä, Tuula; Leskelä, Markku; Niinistö, Lauri (May 1995). "Thermoanalytical studies on samarium sulfite sulfate hydrate". Thermochimica Acta. 256 (1): 67–73. doi:10.1016/0040-6031(94)02170-S.
  22. ^ Zhang, Zai-Chao; Wang, Jia-Hong; Zhao, Pu-Su (2011-05-15). "Dy 2 (SO 3 ) 2 (SO 4 )(H 2 O) 2 : the first lanthanide mixed sulfate–sulfite inorganic compound". Acta Crystallographica Section C Crystal Structure Communications. 67 (5): i27–i29. doi:10.1107/S0108270111009048. ISSN 0108-2701. PMID 21540523.
  23. ^ Abisheva, Z.S.; Parshina, I.N.; Bochevskaya, E.G.; Ushanov, V.Zh. (November 1998). "Chemical conversions of osmium (VI) sulfite complexes in ammonia–sulfate solutions". Hydrometallurgy. 50 (3): 269–278. doi:10.1016/S0304-386X(98)00059-0.
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