Arsenite bromides

The arsenite bromides are mixed anion compounds containing both arsenite and bromide ions. Similar compounds include arsenate bromides,[1] arsenite chlorides,[1] antimonite bromides, antimonite chlorides,[2] and ...

They are in the category of halide oxidoarsenates(III)

List
chem mw crystal system space group unit cell Å volume density comment references
Ermakovite (NH4)(As2O3)2Br hexagonal P6/mmm a = 5.271 c = 9.157 Z = 1 220.3 3.64 uniaxial (–), ω = 1.960 ɛ = 1.716 at 589 nm [3]
In4(As2O5)(As3O7)Br3 triclinic P1 a=7.998 b=10.532 c=11.952 α=70.92° β=79.62° γ=80.27° Z=2 928 4.527 stable to 530°C [4]
La3OBr[AsO3]2 tetragonal P42/mnm a = 13.043 c = 5.6127 Z=4 954.8 5.27 colourless [1]
Ce3OBr[AsO3]2 [5]
Nd3OBr[AsO3]2 [5]
Sm3OBr[AsO3]2 [5]
Gd3OBr[AsO3]2 [5]
Tb3OBr[AsO3]2 [5]
Tm3Br2[As2O5][AsO3] triclinic P1 a = 5.3496 b = 8.6926 c = 10.8184 α = 90.723° β = 94.792° γ = 90.119° Z=2 6.760 pale yellow [5]
Beudantite PbFe3(OH)6SO4AsO4 trigonal R3m a = 7.32, c = 17.02 Z=3 789.79 4.48 Uniaxial (-) nω = 1.957 nε = 1.943 Birefringence: 0.014 [6]
Gallobeudantite PbGa3(AsO4)(SO4)(OH)6 trigonal R3m a = 7.225, c = 17.03 Z=3 769.88 4.87 uniaxial (–) nω = 1.763 nε = 1.750 [7]

References
  1. Yahia, Hamdi Ben; Pöttgen, Rainer; Rodewald, Ute Ch. (2010-10-01). "Crystal Structure of La 3 OBr[AsO 3 ] 2". Zeitschrift für Naturforschung B. 65 (10): 1289–1292. doi:10.1515/znb-2010-1018. ISSN 1865-7117. S2CID 196918204.
  2. Locke, Ralf J. C.; Goerigk, Felix C.; Schäfer, Martin J.; Höppe, Henning A.; Schleid, Thomas (2022). "Synthesis, crystal structures and spectroscopic properties of pure YSb 2 O 4 Br and YSb 2 O 4 Cl as well as Eu 3+ - and Tb 3+ -doped samples". RSC Advances. 12 (2): 640–647. doi:10.1039/D1RA08382A. ISSN 2046-2069. PMC 8693579. PMID 35425089.
  3. Karpenko, Vladimir Yu.; Pautov, Leonid A.; Siidra, Oleg I.; Mirakov, Mirak A.; Zaitsev, Anatoly N.; Plechov, Pavel Yu.; Makhmadsharif, Saimudasir (February 2023). "Ermakovite (NH 4 )(As 2 O 3 ) 2 Br, a new exhalative arsenite bromide mineral from the Fan-Yagnob coal deposit, Tajikistan". Mineralogical Magazine. 87 (1): 69–78. Bibcode:2023MinM...87...69K. doi:10.1180/mgm.2022.116. ISSN 0026-461X. S2CID 252906686.
  4. Pekov, Igor V.; Britvin, Sergey N.; Krivovichev, Sergey V.; Yapaskurt, Vasiliy O.; Vigasina, Marina F.; Turchkova, Anna G.; Sidorov, Evgeny G. (1 April 2021). "Vasilseverginite, Cu9O4(AsO4)2(SO4)2, a new fumarolic mineral with a hybrid structure containing novel anion-centered tetrahedral structural units". American Mineralogist. 106 (4): 633–640. Bibcode:2021AmMin.106..633P. doi:10.2138/am-2020-7611. S2CID 226659801.
  5. Goerigk, Felix C.; Schander, Svetlana; Wickleder, Mathias S.; Schleid, Thomas (2020-07-15). "The Triclinic Lanthanoid(III) Halide Oxidoarsenates(III) Sm 3 Cl 2 [As 2 O 5 ][AsO 3 ] and Tm 3 Br 2 [As 2 O 5 ][AsO 3 ]". Zeitschrift für anorganische und allgemeine Chemie. 646 (13): 985–991. doi:10.1002/zaac.201900360. ISSN 0044-2313. S2CID 225602969.
  6. "Beudantite". www.mindat.org. Retrieved 2022-05-25.
  7. "Gallobeudantite". www.mindat.org. Retrieved 2022-05-24.
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