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7446-08-4

Basic Information
CAS No.: 7446-08-4
Name: Selenium dioxide
Article Data: 426
Molecular Structure:
Molecular Structure of 7446-08-4 (Selenium dioxide)
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: ToxicT,DangerousN,HarmfulXn
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
Synthetic route

silver(I) selenide

7446-08-4

selenium(IV) oxide

Conditions
ConditionsYield
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%
630-10-4

selenourea

7733-02-0

zinc(II) sulfate

A

7782-49-2

selenium

B

zinc(II) selenide

C

7446-08-4

selenium(IV) oxide

Conditions
ConditionsYield
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%
7600-22-8

selenous acid dimethyl ester

7664-41-7

ammonia

A

7782-49-2

selenium

B

7446-08-4

selenium(IV) oxide

C

selenium nitride

Conditions
ConditionsYield
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%
14364-97-7

diethyl selenite

7664-41-7

ammonia

A

7782-49-2

selenium

B

7446-08-4

selenium(IV) oxide

C

selenium nitride

Conditions
ConditionsYield
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;;
6918-51-0

dimethoxy selenium dioxide

A

50-00-0

formaldehyd

B

64-18-6

formic acid

C

7446-08-4

selenium(IV) oxide

Conditions
ConditionsYield
zerfaellt bei hoeherere Temperatur explosionartig;
16276-55-4

diethoxy selenium dioxide

A

7446-08-4

selenium(IV) oxide

B

75-07-0

acetaldehyde

Conditions
ConditionsYield
at 145 - 150℃;
2179-96-6

triselenium dicyanide

74-90-8

hydrogen cyanide

A

7446-08-4

selenium(IV) oxide

B

selenium

selenium

28274-57-9

methaneseleninic acid

A

50-00-0

formaldehyd

B

7446-08-4

selenium(IV) oxide

C

7101-31-7

dimethyl diselenide

D

selenium

selenium

Conditions
ConditionsYield
at 120℃; beim Schmelzen;
2179-96-6

triselenium dicyanide

calcium carbonate

calcium carbonate

A

7446-08-4

selenium(IV) oxide

B

13103-11-2

selenocyanic acid

C

selenium

selenium

2179-96-6

triselenium dicyanide

potassium hydroxide

potassium hydroxide

A

7446-08-4

selenium(IV) oxide

B

13103-11-2

selenocyanic acid

C

selenium

selenium

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  • selenium dioxide,7446-08-4,SeO2

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Consensus Reports

Selenium and its compounds are on the Community Right-To-Know List. Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

Standards and Recommendations

OSHA PEL: TWA 0.2 mg(Se)/m3
ACGIH TLV: TWA 0.2 mg(Se)/m3
DFG MAK: 0.1 mg(Se)/m3

Specification

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.