Borotellurate

The borotellurates are heteropoly anion compounds which have tellurate groups attached to boron atoms. The ratio of tellurate to borate reflects the degree of condensation. In [TeO4(BO3)2]8- the anions are linked into a chain.[1] In [TeO2(BO3)4]10− the structure is zero dimensional with isolated anions. These arrangements of oxygen around boron and tellurium can have forms resembling silicates. The first borotellurates to be discovered were the mixed sodium rare earth compounds in 2015.[1]

The tellurate is of the form TeO6 in an octahedral arrangement. The borate is in the form BO3, with two oxygen atoms shared with two tellurate TeO6 groups.[1]

Related compounds include boroantimonates, galloborates, borogermanates, borophosphates, boroselenates, boroselenites, and borosulfates.[2]

Formation

Borotellurates are formed by heating boric acid, and tellurium dioxide, with metal carbonates or oxides at over 800 °C.[1] Lower temperatures can be used with a flux like potassium carbonate.[3]

Reactions

When heated to around 800 °C the borotellurates decompose by emitting TeO3 vapour and form a metal borate[1] or metal tellurite.[4]

List
chem mw crystal system space group unit cell Å volume density comment references
Rb3BaTeB7O15 837.02 monoclinic P21/n a=9.102 b=6.409 c=25.794 β=97.278 Z=4 1492.6 3.725 actually this is a tellurite [5]
Sr5TeO2(BO3)4 832.94 tetragonal P4/mnc a= 7.6005 c=10.401 600.82 4.604 colourless [6]
Na2Y2TeO4(BO3)2 533.02 monoclinic P21/c a=6.3073, b=9.9279, c=6.7219; β=104.26°; Z=2 407.94 4.339 [1]
barium tellurium borate Ba4B8TeO19 1067.44 monoclinic Cc a=11.512 b=6.667 c=19.700 β=105.734 Z=4 1455.3 4.872 double layers; SHG 1×KH2PO4 [3]
Ba2Mg2TeB2O10 632.52 orthorhombic Cmca a=6.177 b=10.383 c=12.956 Z=4 830.9 5 [7]
Na2Dy2TeO4(BO3)2 680.20 monoclinic P21/c a=6.3089, b=9.9808, c=6.7489; β=104.394°; Z=2 411.62 5.488 decompose 842.1 [1]
Na2Ho2TeO4(BO3)2 685.06 monoclinic P21/c a=6.3060, b=9.9360, c=6.7339; β=104.230°; Z=2 408.98 5.563 decompose 844.2 [1]
Na2Er2TeO4(BO3)2 689.72 monoclinic P21/c a=6.2964, b=9.9056, c=6.7089; β=104.110°; Z=2 405.81 5.645 decompose 850.5 [1]
Na2Tm2TeO4(BO3)2 693.06 monoclinic P21/c a=6.2801, b=9.8594, c=6.6918; β=104.010°; Z=2 401.89 5.727 decompose 852.0 [1]
Na2Yb2TeO4(BO3)2 701.28 monoclinic P21/c a=6.2631, b=9.8269, c=6.6741; β=103.972°; Z=2 398.62 5.843 decompose 871.0 [1]
Na2Lu2TeO4(BO3)2 705.14 monoclinic P21/c a=6.2588, b=9.7998, c=6.6539; β=103.714°; Z=2 396.48 5.907 decompose 878.5 [1]
Pb2Mg2TeB2O10 772.22 orthorhombic Cmca a=6.055 b=10.300 c=12.521 Z=4 780.9 7 [7]

References
  1. Feng, Jiang-He; Hu, Chun-Li; Xu, Xiang; Kong, Fang; Mao, Jiang-Gao (2 March 2015). "Na 2 RE 2 TeO 4 (BO 3 ) 2 (RE = Y, Dy–Lu): Luminescent and Structural Studies on a Series of Mixed Metal Borotellurates". Inorganic Chemistry. 54 (5): 2447–2454. doi:10.1021/ic503068s. PMID 25692324.
  2. Kong, Fang; Ma, Yunxiang; Mao, Jianggao (January 2018). "Lanthanide Inorganic Solids Based on Main Group Borates and Oxyanions of Lone Pair Cations: Lanthanide Inorganic Solids Based on Main Group Borates and Oxyanions of Lone Pair Cations". Chinese Journal of Chemistry. 36 (1): 63–72. doi:10.1002/cjoc.201700597.
  3. Liu, Lili; Young, Joshua; Smeu, Manuel; Halasyamani, P. Shiv (2018-04-16). "Ba 4 B 8 TeO 19 : A UV Nonlinear Optical Material". Inorganic Chemistry. 57 (8): 4771–4776. doi:10.1021/acs.inorgchem.8b00510. ISSN 0020-1669. PMID 29613780.
  4. Daub, Michael; Krummer, Michael; Hoffmann, Anke; Bayarjargal, Lkhamsuren; Hillebrecht, Harald (2017-01-26). "Synthesis, Crystal Structure, and Properties of Bi 3 TeBO 9 or Bi 3 (TeO 6 )(BO 3 ): A Non-Centrosymmetric Borate-Tellurate(VI) of Bismuth". Chemistry - A European Journal. 23 (6): 1331–1337. doi:10.1002/chem.201602480. PMID 27981647.
  5. Sun, Jun; Mutailipu, Miriding; Cheng, Shichao; Yang, Zhihua; Pan, Shilie (2020). "Rb 3 BaTeB 7 O 15 : a novel [B 7 O 16 ] fundamental building block in a new telluroborate with [TeO 3 ] polyhedra". Dalton Transactions. 49 (26): 8911–8917. doi:10.1039/D0DT01102A. ISSN 1477-9226. PMID 32555807. S2CID 219910405.
  6. Tang, Ruling; Hu, Chunli; Feng, Jianghe; Fang, Zhi; Chen, Yan; Kong, Fang; Mao, Jianggao (2020). "Sr 5 TeO 2 (BO 3 ) 4 and NaSr 5 (BO 3 )(SiO 4 ) 2 : two inorganic metal borate derivatives with diverse zero dimensional anions". Dalton Transactions. 49 (12): 3743–3749. doi:10.1039/C9DT03839F. ISSN 1477-9226. PMID 31729509. S2CID 208037429.
  7. Wen, Ming; Wu, Hongping; Hu, Cong; Yang, Zhihua; Pan, Shilie (2019-08-19). "Experiment and First-Principles Calculations of A 2 Mg 2 TeB 2 O 10 (A = Pb, Ba): Influences of the Cosubstitution on the Structure Transformation and Optical Properties". Inorganic Chemistry. 58 (16): 11127–11132. doi:10.1021/acs.inorgchem.9b01693. ISSN 0020-1669. PMID 31355637. S2CID 198965987.
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