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| CAS No.: | 7446-08-4 |
|---|---|
| Name: | Selenium dioxide |
| Article Data: | 426 |
| Cas Database | |
| Molecular Structure: | |
|
|
|
| Formula: | SeO2 |
| Molecular Weight: | 110.959 |
| Synonyms: | NSC 56753;Selenium(IV) oxide; |
| EINECS: | 231-194-7 |
| Density: | 3.95 g/cm3 |
| Melting Point: | 315 °C (subl.)(lit.) |
| Boiling Point: | 684.9 °C(lit.) |
| Flash Point: | 315oC |
| Solubility: | 38.4 g/100 mL (14 °C) in water |
| Appearance: | light pink solid |
| Hazard Symbols: |
 T, N, Xn
|
| Risk Codes: | 36/38-50/53-33-23/25-51/53-20/22 |
| Safety: | 26-61-60-45-28A-20/21-28 |
| Transport Information: | UN 3440 6.1/PG 3 |
| PSA: | 34.14000 |
| LogP: | -0.61840 |
selenium(IV) oxide
| Conditions | Yield |
|---|---|
| With air In neat (no solvent) reaction at 700°C within 30 minutes;; | 99% |
| With oxygen In neat (no solvent) reaction with O2 in presence of N2 (3 % O2) at 700°C within 30 minutes;; | 50.6% |
| With oxygen In neat (no solvent) reaction with O2 in presence of N2 (1 % O2) at 700°C within 30 minutes;; | 27.8% |
| Conditions | Yield |
|---|---|
| With NH3; Na2SO3; N2H4*H2O In water Kinetics; byproducts: Zn(O,OH), Zn; 60°C; 20 min; pH 11.5; deposited on glass; not isolated; detected by XPS; | A 14% B 77% C 4% |
| Conditions | Yield |
|---|---|
| In ammonia reaction of OSe(OCH3)2 with an excess of liq. NH3 in a bomb for 12 h;; evaporation of the excess of NH3; addn. of abs. ether; filtration; washing with H2O and 10% KCN soln.;; | A 5.3% B 45.8% C 48.8% |
| Conditions | Yield |
|---|---|
| In ammonia reaction of OSe(OC2H5)2 with an excess of liq. NH3 in a bomb for 12 h;; evaporation of the excess of NH3; addn. of abs. ether; filtration; washing with H2O and 10% KCN soln.;; | A 5.3% B 45.8% C 48.8% |
| In benzene byproducts: N2; dropwise addition of OSe(OCH2CH3)2 to dry benzene; introduction of NH3 into this solution;; sucking off; treatment with water and 10% KCN soln.; carefully dried at 105°C;; |
dimethoxy selenium dioxide
A
formaldehyd
B
formic acid
C
selenium(IV) oxide
| Conditions | Yield |
|---|---|
| zerfaellt bei hoeherere Temperatur explosionartig; |
| Conditions | Yield |
|---|---|
| at 145 - 150℃; |
methaneseleninic acid
A
formaldehyd
B
selenium(IV) oxide
C
dimethyl diselenide
| Conditions | Yield |
|---|---|
| at 120℃; beim Schmelzen; |
triselenium dicyanide
water
A
selenium(IV) oxide
B
selenocyanic acid
triselenium dicyanide
water
A
selenium(IV) oxide
B
selenocyanic acid
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Selenium and its compounds are on the Community Right-To-Know List. Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.
OSHA PEL: TWA 0.2 mg(Se)/m3
ACGIH TLV: TWA 0.2 mg(Se)/m3
DFG MAK: 0.1 mg(Se)/m3
Selenium dioxide is the chemical compound with the formula SeO2. This colorless solid is one of the most frequently encountered compounds of selenium. With the CAS NO. 7446-08-4, Solid SeO2 is a one-dimensional polymer, the chain consisting of alternating selenium and oxygen atoms. Each Se atom is pyramidal and bears a terminal oxide group.
Preparation of Selenium dioxide: Selenium dioxide is prepared by oxidation of selenium by burning in air, nitric acid or by reaction with hydrogen peroxide, but perhaps the most convenient preparation is by the dehydration of selenous acid.
3 Se + 4 HNO3 + H2O → 3 H2SeO3 + 4 NO
2 H2O2 + Se → SeO2 + 2 H2O
H2SeO3 →SeO2 + H2O
Uses of Selenium dioxide: Selenium dioxide can be used for making high-purity selenium and other selenium compounds, or organic synthetic drugs' oxidants and catalyst. Either ,selenium dioxide can used as a base special reagents of alkali plant ,and can be used to precipitate zirconium and hafnium and preparat selenium compounds.
When you are using this chemical, please be cautious about it as the following:
1. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice;
2. Avoid release to the environment. Refer to special instructions safety data sheet;
3. This material and/or its container must be disposed of as hazardous waste;
4. In case of accident or if you feel unwell, seek medical advice immediately (show label where possible);
5. When using, do not eat, drink or smoke;
You can still convert the following datas into molecular structure:
(1)InChI=1S/O2Se/c1-3-2;
(2)InChIKey=JPJALAQPGMAKDF-UHFFFAOYSA-N;
(3)Smiles[Se](=O)=O;
The toxicity data is as follows:
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| gerbil | LDLo | subcutaneous | 7500ug/kg (7.5mg/kg) | Journal of the Royal Microscopical Society. Vol. 85, Pg. 297, 1965. | |
| mouse | LD50 | intraperitoneal | 4300ug/kg (4.3mg/kg) | BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
| mouse | LD50 | intravenous | 9200ug/kg (9.2mg/kg) | BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
| mouse | LD50 | oral | 23300ug/kg (23.3mg/kg) | BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
| rabbit | LD50 | subcutaneous | 4mg/kg (4mg/kg) | Clinical Toxicology. Vol. 17, Pg. 171, 1980. | |
| rat | LD50 | intraperitoneal | 3600ug/kg (3.6mg/kg) | BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
| rat | LD50 | intravenous | 2710ug/kg (2.71mg/kg) | BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
| rat | LD50 | oral | 68100ug/kg (68.1mg/kg) | BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) | Indian Journal of Pharmacology. Vol. 23, Pg. 153, 1991. |
