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| CAS No.: | 7803-68-1 |
|---|---|
| Name: | Orthotelluric acid |
| Article Data: | 113 |
| Molecular Structure: | |
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|
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| Formula: | H6O6 Te |
| Molecular Weight: | 229.644 |
| Synonyms: | Telluric(VI)acid (H6TeO6) (6CI,7CI);Hydrogen tellurate (H6TeO6);Orthotelluric acid;Tellurium hexahydroxide;Tellurium hydroxide (Te(OH)6); |
| EINECS: | 232-267-6 |
| Density: | g/cm3 |
| Boiling Point: | °Cat760mmHg |
| Flash Point: | °C |
| Hazard Symbols: | As for tellurium. |
| Risk Codes: | R20 |
| Safety: | Poison by ingestion and intravenous routes. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS. |
| PSA: | 121.38000 |
| LogP: | -1.44160 |
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| Conditions | Yield |
|---|---|
| In water oxidation;; | A 0% B n/a |
| In water very slow oxidation;; | A 0% B n/a |
- Total:36 Page 1 of 1 1
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Chemistry
Molecule structure of Telluric acid (CAS NO.7803-68-1) :
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Molecular Weight: 229.64404 g/mol
Molecular Formula: H6O6Te
Solubility: H2O: 0.1 g/mL, clear, colorless
Merck: 13.9200
H-Bond Donor: 6
H-Bond Acceptor: 6
Exact Mass: 231.922661
MonoIsotopic Mass: 231.922661
Topological Polar Surface Area: 121
Heavy Atom Count: 7
Complexity: 62.7
Canonical SMILES: O[Te](O)(O)(O)(O)O
InChI: InChI=1S/H6O6Te/c1-7(2,3,4,5)6/h1-6H
InChIKey: FXADMRZICBQPQY-UHFFFAOYSA-N
EINECS: 232-267-6
Product Categories of Telluric acid (CAS NO.7803-68-1) : Acids; Electronic Chemicals; Micro/Nanoelectronics
Production
Telluric acid is formed by the oxidation of tellurium or tellurium dioxide with a powerful oxidising agent such as hydrogen peroxide, chromium trioxide or sodium peroxide.
TeO2 + H2O2 + 2H2O → Te(OH)6
Crystallisation of telluric acid solutions below 10 °C gives Te(OH)6.4H2O. It is oxidizing, as shown by the electrode potential for the reaction below, although it is kinetically slow in its oxidations.
H6TeO6 + 2H+ + 2e− TeO2 + 4H2O Eo = +1.02 V
Toxicity Data With Reference
| 1. | ivn-rat LDLo:31 mg/kg | JPETAB Journal of Pharmacology and Experimental Therapeutics. 33 (1928),270. | ||
| 2. | orl-rbt LDLo:56 mg/kg | JPETAB Journal of Pharmacology and Experimental Therapeutics. 33 (1928),270. | ||
| 3. | ivn-rbt LDLo:5600 µg/kg | JPETAB Journal of Pharmacology and Experimental Therapeutics. 33 (1928),270. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Poison by ingestion and intravenous routes. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.
Hazard Codes:
Xn
Risk Statements: 20
R20:Harmful by inhalation.
Safety Statements: 22-36/37/39-38
S22:Do not breathe dust.
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
S38:In case of insufficient ventilation, wear suitable respiratory equipment.
RIDADR UN: 3284 6.1/PG 3
WGK Germany: 3
RTECS: WY2350000
F: 8
HazardClass: 6.1(a)
PackingGroup: II
Standards and Recommendations
OSHA PEL: TWA 0.1 mg(Te)/m3
ACGIH TLV: TWA 0.1 mg(Te)/m3
Specification
Telluric acid (CAS NO.7803-68-1) is also called Telluric(VI) acid ; CCRIS 9168 ; Orthotelluric acid ; Tellurate ; Tellurium hydroxide ; Telluric acid (H6TeO6) .The anhydrous acid of Telluric acid (CAS NO.7803-68-1) is stable in air at 100 °C but above this it dehydrates to form polymetatelluric acid, a white hygroscopic powder (approximate composition (H2TeO4)10), and allotelluric acid, an acid syrup of unknown structure (approximate composition (H2TeO4)3(H2O)4). Strong heating at over 300 °C produces the α- crystalline modification of tellurium trioxide, α-TeO3.
Reaction with diazomethane gives the hexamethyl ester, Te(OMe)6. Telluric acid and its salts mostly contain hexacoordinate tellurium. This is true even for salts such as magnesium tellurate, MgTeO4, which is isostructural with magnesium molybdate and contains TeO6 octahedra.