Tellurium oxyanions Tellurate

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1 tellurium oxyanions

1.1 metatellurates
1.2 orthotellurates
1.3 teo4−5 ion
1.4 polymeric tellurate ions
1.5 aqueous chemistry
1.6 structural comparisons oxyanions of sulfur , selenium





tellurium oxyanions

historically name tellurate applied oxyanions of tellurium oxidation number +6, formally derived telluric acid te(oh)6, , name tellurite referred oxyanions of tellurium oxidation number +4, formally derived tellurous acid (ho)2teo , these names in common use. tellurate , tellurite referred tellurate(vi) , tellurate(iv) respectively in line iupac renaming recommendations. metatellurate ion teo2−

4 , orthotellurate ion teo6−

6. other oxyanions include pentaoxotellurate, teo4−

5, ditellurate, te

2o8−

10 , polymeric anions 6-coordinate tellurium such (teo4−

5)n.


metatellurates

the metatellurate ion teo2−

4 analogous sulfate ion, so2−

4 , selenate ion, seo2−

4. whereas many sulfates , selenates form isomorphous salts tetrahedral metatellurate ion found in few compounds such tetraethylammonium salt net4teo4. many compounds stoichiometry suggests presence of metatellurate ion contain polymeric anions containing 6-coordinate tellurium(vi), example sodium tellurate, na2teo4 contains octahedral tellurium centers sharing edges.



teo2−

4 → teo2−

3 +  ⁄2 o2      (e = −1.042 v)

the e or standard reduction potential value significant gives indication of strength of tellurate ion oxidizing agent.


orthotellurates

compounds containing octahedral teo6−

6 anion known, these include ag6teo6, na6teo6 , hg3teo6. there hydroxyoxotellurates, containing protonated teo6−

6, such (nh4)2teo2(oh)4 (sometimes written nh4teo4·2h2o) contains octahedral teo

2(oh)2−

4 ion.


teo4−

5 ion

the compound cs2k2teo5 contains teo4−

5 ions trigonal bipyramidal. compound rb6te2o9 contains both teo4−

5 , teo2−

4 anions. other compounds stoichiometry suggests presence of teo4−

5 may contain either dimeric te

2o8−

10 made of 2 edge-sharing {teo6} in li4teo5 , ag4teo5 or corner-sharing {teo6} octahedra in hg2teo5.


polymeric tellurate ions

the dimeric te

2o8−

10 made of 2 edge sharing {teo6} octahedra found in compound, li4teo5. similar hydroxy-oxy anion, te2o6(oh)4 found in sodium potassium ditellurate(vi) hexahydrate,na0.5k3.5te2o6(oh)4·6h2o contains pairs of edge sharing octahedra. polymeric chain anions consisting of corner-shared {teo6} octahedra (teo5)4n−

n found, example in li4teo5.


aqueous chemistry

in aqueous solution tellurate ions 6 coordinate. in neutral conditions pentahydrogen orthotellurate ion, h

5teo−

6, common; in basic conditions, tetrahydrogen orthotellurate ion, h

4teo2−

6, , in acid conditions, orthotelluric acid, te(oh)6 or h6teo6 formed.


structural comparisons oxyanions of sulfur , selenium

sulfur(vi) oxyanions have coordination number of 4 , in addition tetrahedral sulfate ion, so2−

4, pyrosulfate, s

2o2−

7, trisulfate, s

3o2−

10 , pentasulfate s

5o2−

16 ions contain 4-coordinate sulfur , built corner-shared {so4} tetrahedra. selenate compounds include many examples of 4 coordinate selenium, principally tetrahedral seo2−

4 ion , pyroselenate ion, se

2o2−

7 has similar structure pyrosulfate ion. unlike sulfur there examples of 5-coordinate selenium oxyanion, seo4−

5 , 1 example of seo6−

6.








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