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. 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.

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.

Related compounds include boroantimonates, galloborates, borogermanates, borophosphates, boroselenates, boroselenites, and borosulfates.{{cite journal |last1=Kong |first1=Fang |last2=Ma |first2=Yunxiang |last3=Mao |first3=Jianggao |title=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 |journal=Chinese Journal of Chemistry |date=January 2018 |volume=36 |issue=1 |pages=63–72 |doi=10.1002/cjoc.201700597}}

Formation

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

Reactions

When heated to around 800 °C the borotellurates decompose by emitting TeO₃ vapour and form a metal borate or metal tellurite.{{Cite journal|last1=Daub|first1=Michael|last2=Krummer|first2=Michael|last3=Hoffmann|first3=Anke|last4=Bayarjargal|first4=Lkhamsuren|last5=Hillebrecht|first5=Harald|date=2017-01-26|title=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|url=http://doi.wiley.com/10.1002/chem.201602480|journal=Chemistry - A European Journal|language=en|volume=23|issue=6|pages=1331–1337|doi=10.1002/chem.201602480|pmid=27981647|url-access=subscription}}

List

class="wikitable"

!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

|{{Cite journal|last1=Sun|first1=Jun|last2=Mutailipu|first2=Miriding|last3=Cheng|first3=Shichao|last4=Yang|first4=Zhihua|last5=Pan|first5=Shilie|date=2020|title=Rb 3 BaTeB 7 O 15 : a novel [B 7 O 16 ] fundamental building block in a new telluroborate with [TeO 3 ] polyhedra|url=http://xlink.rsc.org/?DOI=D0DT01102A|journal=Dalton Transactions|language=en|volume=49|issue=26|pages=8911–8917|doi=10.1039/D0DT01102A|pmid=32555807|s2cid=219910405|issn=1477-9226|url-access=subscription}}

|Sr₅TeO₂(BO₃)₄

|832.94

|tetragonal

|P4/mnc

|a= 7.6005 c=10.401 Z=2

|600.82

|4.604

|colourless; birefringence is 0.048 at 1064 nm

|{{Cite journal|last1=Tang|first1=Ruling|last2=Hu|first2=Chunli|last3=Feng|first3=Jianghe|last4=Fang|first4=Zhi|last5=Chen|first5=Yan|last6=Kong|first6=Fang|last7=Mao|first7=Jianggao|date=2020|title=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|url=http://xlink.rsc.org/?DOI=C9DT03839F|journal=Dalton Transactions|language=en|volume=49|issue=12|pages=3743–3749|doi=10.1039/C9DT03839F|pmid=31729509|s2cid=208037429|issn=1477-9226|url-access=subscription}}

|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

|{{cite journal |last1=Feng |first1=Jiang-He |last2=Hu |first2=Chun-Li |last3=Xu |first3=Xiang |last4=Kong |first4=Fang |last5=Mao |first5=Jiang-Gao |title=Na ₂ RE ₂ TeO ₄ (BO ₃ ) ₂ (RE = Y, Dy–Lu): Luminescent and Structural Studies on a Series of Mixed Metal Borotellurates |journal=Inorganic Chemistry |date=2 March 2015 |volume=54 |issue=5 |pages=2447–2454 |doi=10.1021/ic503068s|pmid=25692324 }}

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

|{{Cite journal|last1=Liu|first1=Lili|last2=Young|first2=Joshua|last3=Smeu|first3=Manuel|last4=Halasyamani|first4=P. Shiv|date=2018-04-16|title=Ba 4 B 8 TeO 19 : A UV Nonlinear Optical Material|url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.8b00510|journal=Inorganic Chemistry|language=en|volume=57|issue=8|pages=4771–4776|doi=10.1021/acs.inorgchem.8b00510|pmid=29613780|issn=0020-1669|url-access=subscription}}

|Ba₂Mg₂TeB₂O₁₀

|632.52

|orthorhombic

|Cmca

|a=6.177 b=10.383 c=12.956 Z=4

|830.9

|{{Cite journal|last1=Wen|first1=Ming|last2=Wu|first2=Hongping|last3=Hu|first3=Cong|last4=Yang|first4=Zhihua|last5=Pan|first5=Shilie|date=2019-08-19|title=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|url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.9b01693|journal=Inorganic Chemistry|language=en|volume=58|issue=16|pages=11127–11132|doi=10.1021/acs.inorgchem.9b01693|pmid=31355637|s2cid=198965987|issn=0020-1669|url-access=subscription}}

|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

|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

|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

|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

|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

|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

|Pb₂Mg₂TeB₂O₁₀

|772.22

|orthorhombic

|Cmca

|a=6.055 b=10.300 c=12.521 Z=4

|780.9

References

Category:Borates

Category:Tellurates