Selenium dioxide supplier | CasNO.7446-08-4

Name
Selenium dioxide
EINECS 231-194-7
CAS No. 7446-08-4
Article Data426
CAS DataBase
Density 3.95 g/cm³
Solubility 38.4 g/100 mL (14 °C) in water
Melting Point 315 °C (subl.)(lit.)
Formula SeO₂
Boiling Point 684.9 °C(lit.)
Molecular Weight 110.959
Flash Point 315oC
Transport Information UN 3440 6.1/PG 3
Appearance light pink solid
Safety 26-61-60-45-28A-20/21-28
Risk Codes 36/38-50/53-33-23/25-51/53-20/22
Molecular Structure
Hazard Symbols T,N,Xn
Synonyms NSC 56753;Selenium(IV) oxide;
PSA 34.14000
LogP -0.61840

Synthetic route

: silver(I) selenide

: 7446-08-4
selenium(IV) oxide

Conditions

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%

: 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

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%

...Expand

: 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

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%

...Expand

: 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

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;;

...Expand

: 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

Conditions	Yield
zerfaellt bei hoeherere Temperatur explosionartig;

...Expand

: 16276-55-4
diethoxy selenium dioxide

A: 7446-08-4
selenium(IV) oxide

B: 75-07-0
acetaldehyde

Conditions

Conditions	Yield
at 145 - 150℃;

: 2179-96-6
triselenium dicyanide

: 74-90-8
hydrogen cyanide

: 7732-18-5
water

A: 7446-08-4
selenium(IV) oxide

B selenium: selenium

...Expand

: 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

Conditions	Yield
at 120℃; beim Schmelzen;

...Expand

: 2179-96-6
triselenium dicyanide

: 7732-18-5
water

calcium carbonate: calcium carbonate

A: 7446-08-4
selenium(IV) oxide

B: 13103-11-2
selenocyanic acid

C selenium: selenium

...Expand

: 2179-96-6
triselenium dicyanide

: 7732-18-5
water

potassium hydroxide: potassium hydroxide

A: 7446-08-4
selenium(IV) oxide

B: 13103-11-2
selenocyanic acid

C selenium: selenium

...Expand

: 7600-22-8
selenous acid dimethyl ester

: 7664-41-7
ammonia

A: 67-56-1
methanol

B: 7446-08-4
selenium(IV) oxide

C Se4N4: Se4N4

D selenium: selenium

Conditions

Conditions	Yield
und Stehenlassen des Reaktionsgemisches bei Raumtemperatur;

...Expand

: 14364-97-7
diethyl selenite

: 7664-41-7
ammonia

A: 7446-08-4
selenium(IV) oxide

B: 64-17-5
ethanol

C Se4N4: Se4N4

D selenium: selenium

...Expand

: 14364-97-7
diethyl selenite

: 7664-41-7
ammonia

: 71-43-2
benzene

A: 7446-08-4
selenium(IV) oxide

B: 64-17-5
ethanol

C Se4N4: Se4N4

D selenium: selenium

...Expand

: 28076-02-0
1,5-diphenyl-3,3-dichloro-3-selena-1,5-pentanedione

: 7732-18-5
water

A: 7446-08-4
selenium(IV) oxide

B: 98-86-2
acetophenone

...Expand

: 28076-02-0
1,5-diphenyl-3,3-dichloro-3-selena-1,5-pentanedione

diluted NaOH-solution: diluted NaOH-solution

A: 7446-08-4
selenium(IV) oxide

B: 98-86-2
acetophenone

...Expand

: 7782-49-2
selenium

: 1015938-55-2, 7789-52-8
diselenium dibromide

: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
With silver(l) oxide In water

: phosphorous

: 13465-66-2, 271781-78-3
selenium(IV) fluoride

A: 7446-08-4
selenium(IV) oxide

B: 13478-20-1
trifluorophosphoric acid

C: 1087413-67-9
nitrosylsulfuric acid fluoride

D: 7783-55-3
trifluorophosphane

...Expand

: silver selenite

: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
In neat (no solvent) thermal decomposition;;

: silver selenite

A: 7446-08-4
selenium(IV) oxide

B: 7440-22-4
silver

Conditions

Conditions	Yield
In neat (no solvent) Kinetics; byproducts: O2; isothermal heating of silver selenite in open Pt crucible in N2 flow (25cm**3/min), temp. interval of 923-1123 K;

: cadmium(II) selenite

A: 7446-08-4
selenium(IV) oxide

B: cadmium(II) oxide

Conditions

Conditions	Yield
In neat (no solvent) Kinetics; isothermal heating of cadmium selenite in open Pt crucible in N2 flow (25 cm**3/min), temp. interval of 923-1123 K;
In neat (no solvent) Kinetics; isothermal decomposition at 823 - 928 K in N2;

: lead(IV) selenite

A: 7446-08-4
selenium(IV) oxide

B: lead dioxide

Conditions

Conditions	Yield
In solid Kinetics; heating the selenite in air at 1023-1173 K;

: germanium(IV) selenite

A: 7446-08-4
selenium(IV) oxide

B: germanium dioxide

Conditions

Conditions	Yield
In solid Kinetics; heating the selenite in air at 723-873 K;
In neat (no solvent) Kinetics; isothermal heating of Ge selenite in open Pt crucible in N2 flow (25 cm**3/min), temp. interval of 723-923 K;

: 10028-15-6
ozone

: 10025-68-0
diselenium dichloride

A: 7446-08-4
selenium(IV) oxide

B: 10026-03-6
selenium tetrachloride

Conditions

Conditions	Yield
In not given byproducts: O2;

...Expand

: 7791-23-3
selenium oxychloride

: 10028-15-6
ozone

: 10025-68-0
diselenium dichloride

A: 7446-08-4
selenium(IV) oxide

B: 80937-33-3
oxygen

Conditions

Conditions	Yield
In neat (no solvent)
In neat (no solvent)

...Expand

: 80937-33-3
oxygen

: 10028-15-6
ozone

: 10025-68-0
diselenium dichloride

: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
In neat (no solvent) byproducts: Se chloride; reaction by passing of O3-containing O2 through Se2Cl2;; formation of a white pptn.;;
In neat (no solvent) byproducts: Se chloride; reaction by passing of O3-containing O2 through Se2Cl2;; formation of a white pptn.;;

...Expand

: 7782-49-2
selenium

: 10028-15-6
ozone

: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
In tetrachloromethane
In neat (no solvent) treatment of Se powder with ozone;;
In neat (no solvent)

: neodymium(III) oxide

: SeOCl(1+)

A: 7446-08-4
selenium(IV) oxide

B: 7791-23-3
selenium oxychloride

C: neodymium(III)

Conditions

Conditions	Yield
dissolution of Nd2O3 in SeOCl2; soln. used as liquid laser;

...Expand

: indium(III) selenite

A: indium(III) oxide

B: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
In neat (no solvent) Kinetics; isothermal heating of indium selenite in open Pt crucible in N2 flow (25cm**3/min), temp. interval of 723-923 K;
In solid Kinetics; thermal decompn. at 723-973 K;

: aluminium selenite

A: 1333-84-2, 1344-28-1
aluminum oxide

B: 7446-08-4
selenium(IV) oxide

Conditions

Conditions	Yield
In neat (no solvent) Kinetics; isothermal heating of Al selenite in open Pt crucible in N2 flow (25 cm**3/min), temp. interval of 723-923 K;
In solid Kinetics; thermal decompn. at 723-973 K;

: 7446-08-4
selenium(IV) oxide

: 353-50-4
Carbonyl fluoride

A: 7783-43-9
selenyl fluoride

B: 124-38-9
carbon dioxide

Conditions

Conditions	Yield
In neat (no solvent) slight excess over the stoich. amt. of COF2 required; reaction mixt. heated in a stainless steel or monel cylinder at 200°C for 50 h;	A 100% B n/a

...Expand

: 7446-08-4
selenium(IV) oxide

: vanadia

: cadmium(II) oxide

: cadmium(II) vanadium selenite

Conditions

Conditions	Yield
In neat (no solvent, solid phase) mixture ground, pressed into pellets, heated in evac. sealed tube at 300°C for 1 d and at 680 °C for 6 d, cooled to 280 °C at 4 °C, cooled to room temp. in 10 h; elem. anal.;	100%

...Expand

: 7446-08-4
selenium(IV) oxide

: thallium chloride

: uranium(VI) trioxide

: 409306-24-7
Tl(1+)*UO2(2+)*HSeO3(1-)*SeO3(2-)=Tl(UO2)(HSeO3)(SeO3)

Conditions

Conditions	Yield
In water TlCl, UO3, SeO2 and water were heated in PTFE-lined autoclave for 72 h at 180°C and cooled at 9°C/h to 23°C, crystals were washed with water and MeOH and dried;	99%

...Expand

: praseodymium oxide

: praseodymium

: 7446-08-4
selenium(IV) oxide

: rubidium chloride

: lithium chloride

: rubidium lithium praseodymium(III) chloride oxoselenate(IV)

Conditions

Conditions	Yield
In neat (no solvent) "Pr2O3":SeO2 molar ratio was 1:6, LiCl:RbCl olar ratio was 1.37:1, excess of fluxing agent, 500 °C in an evacuated silica ampoule, 2 months;	99%

...Expand

: 1313-99-1
nickel(II) oxide

: 7446-08-4
selenium(IV) oxide

: molybdenum(VI) oxide

: nickel(II) molybdenum(VI) selenium(IV) oxide

Conditions

Conditions	Yield
In neat (no solvent, solid phase) heating 3:2:1 mixt. of nickel oxide, molybdenum trioxide and selenum dioxide in vac. at 710°C for 6 d; IR;	99%

...Expand

: strontium(II) oxide

: 7446-08-4
selenium(IV) oxide

: strontium chloride

: Sr3(SeO3)(S2O5)Cl2

Conditions

Conditions	Yield
In neat (no solvent, solid phase) by a react. of a mixt. of SrO, SrCl2 and SeO2 in a molar ratio of 2:1:3 at 660°C for 6 d; identified by XRD;	99%

...Expand

: 7446-08-4
selenium(IV) oxide

: vanadia

: 584-08-7
potassium carbonate

: potassium vanadium selenite

Conditions

Conditions	Yield
In water teflon-lined hydrothermal bomb; 473 K, 4 d; sonication (1 h in H2O);	96%

...Expand

: 7446-08-4
selenium(IV) oxide

: rubidium chloride

: uranium(VI) trioxide

: 409306-22-5
Rb(1+)*UO2(2+)*HSeO3(1-)*SeO3(2-)=Rb(UO2)(HSeO3)(SeO3)

Conditions

Conditions	Yield
In water RbCl, UO3, SeO2 and water were heated in PTFE-lined autoclave for 72 h at 180°C and cooled at 9°C/h to 23°C, crystals were washed with water and MeOH and dried;	96%

...Expand

: 7446-08-4
selenium(IV) oxide

: barium hydroxide octahydrate

: molybdenum(VI) oxide

: BaMoO3SeO3

Conditions

Conditions	Yield
In water Ba:Mo:Se = 1:1:1, hydrothermal treatment (autogenous pressure, 160°C, 4 d);	96%

...Expand

: indium(III) oxide

: 7446-08-4
selenium(IV) oxide

: 7732-18-5
water

: In(3+)*OH(1-)*SeO3(2-)=In(OH)(SeO3)

Conditions

Conditions	Yield
In water High Pressure; mixt. of oxides and water heated in autoclave at 160°C for 3 d, cooled to room temp. over a few h;	95.2%

...Expand

: 7446-08-4
selenium(IV) oxide

: 10213-10-2
sodium tungstate (VI) dihydrate

: copper(II) choride dihydrate

: cesium chloride

: 7732-18-5
water

: Cs6Na[(α-SeW9O33)2Cu3(H2O)3Cs3(H2O)6]*7H2O

Conditions

Conditions	Yield
With sodium acetate buffer In water SeO2 and Na2WO42H2O added to soln. of CuCl22H2O (molar ratio 1:9:1.6) in sodium acetate buffer (pH 4.8); heated to 90°C for 1 h; cooled; solid CsCl added; ppt. isolated; air dried; elem. anal.;	95%

...Expand

: 7446-08-4
selenium(IV) oxide

: nickel(II) chloride hexahydrate

: barium carbonate

: Ba(2+)*2Ni(2+)*3SeO3(2-)*99H2O=BaNi2(SeO3)3*99H2O

Conditions

Conditions	Yield
In water High Pressure; BaCO3, NiCl2*6H2O and SeO2 (1:2:3) in H2O heated in an autoclave at 180°C for 3 d; cooled to room temp. over 3 h, filtered, washed (H2O);	95%

...Expand

: sodium molybdate

: 7446-08-4
selenium(IV) oxide

: Na2SeMoO6

Conditions

Conditions	Yield
In neat (no solvent, solid phase) from a stoich. mixt. of SeO2 and Na2MoO4; heating to 370°C for 1 d and then cooling at 6°/h to ambient temp. in an evacuated and sealed tubes;	90%

: potassium molybdate(VI)

: 7446-08-4
selenium(IV) oxide

: K2SeMoO6

Conditions

Conditions	Yield
In neat (no solvent, solid phase) from a stoich. mixt. of SeO2 and K2MoO4; heating to 370°C for 1 dand then cooling at 6°/h to ambient temp. in an evacuated and se aled tubes;	90%

: 7782-49-2
selenium

: 7446-08-4
selenium(IV) oxide

: 7726-95-6
bromine

: 1015938-55-2, 7789-52-8
diselenium dibromide

Conditions

Conditions	Yield
With sulfur dioxide In water simultaneous addition of Br2 and introduction of SO2 into a soln. of SO2 in ice water; after decoloration, SeO2 and Se are added; addition of concd. H2SO4; cooling;; washing with concd. H2SO4;;	90%
With SO2 In water simultaneous addition of Br2 and introduction of SO2 into a soln. of SO2 in ice water; after decoloration, SeO2 and Se are added; addition of concd. H2SO4; cooling;; washing with concd. H2SO4;;	90%

...Expand

: 7446-08-4
selenium(IV) oxide

: vanadia

: calcium hydroxide

: Ca2(VO2)2(SeO3)3*2H2O=Ca2(VO2)2(SeO3)3(H2O)2

Conditions

Conditions	Yield
In water High Pressure; Ca(OH)2, V2O5 and SeO4 and water were heated in Teflon-lined autoclave at 230°C for 4 days; react. mixt. was cooled slowly to room temp. at 6°C/h, ppt. was filtered, washed with water and acetone;	90%

...Expand

: 7446-08-4
selenium(IV) oxide

: uranium(VI) trioxide

: calcium carbonate

: calcium hydroxide

: Ca(2+)*UO2(2+)*2SeO3(2-)=Ca((UO2)(SeO3)2)

Conditions

Conditions	Yield
In water High Pressure; UO3, SeO2, CaCO3, Ca(OH)2 and water were loaded in autoclave, sealed, placed in furnace for 30 ds at 180°C, cooled to 23°C at 9°C/h; washed with MeOH, dried;	89%

...Expand

: 7446-08-4
selenium(IV) oxide

: potassium chloride

: uranium(VI) trioxide

: 409306-21-4
K(1+)*UO2(2+)*HSeO3(1-)*SeO3(2-)=K(UO2)(HSeO3)(SeO3)

Conditions

Conditions	Yield
In water KCl, UO3, SeO2 and water were heated in PTFE-lined autoclave for 72 h at180°C and cooled at 9°C/h to 23°C, crystals were w ashed with water and MeOH and dried;	88%

...Expand

: 7446-08-4
selenium(IV) oxide

: vanadia

: vanadia

: potassium hydroxide

: KV2SeO7

Conditions

Conditions	Yield
In water molar ratio V2O5:V2O3:SeO2:KOH=2:2:15:10, 230°C, 3 d (autoclave); slow cooling to room temp., collection (filtration); powder X-ray diffraction, optical microscopy;	87%
In water molar ratio V2O5:V2O3:SeO2:KOH=3:1:15:10, 230°C, 3 d (autoclave); slow cooling to room temp., collection (filtration); powder X-ray diffraction, optical microscopy;	69%

...Expand

: 7446-08-4
selenium(IV) oxide

: 584-08-7
potassium carbonate

: potassium selenite

Conditions

Conditions	Yield
In methanol byproducts: CO2; room temp.; recrystn. (ether/methanol); elem. anal.;	87%

: rubidium carbonate

: 7446-08-4
selenium(IV) oxide

: 7732-18-5
water

: tungsten(VI) oxide

: Rb2(WO3)3SeO3

Conditions

Conditions	Yield
mixt. (NH4:W:Se=2:1:2) placing in Teflon-lined hydrothermal reaction vessel, heating to 210°C for 10 d (final pH 3.4); TGA;	86%

...Expand

Selenium dioxide Consensus Reports

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

Selenium dioxide 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

Selenium dioxide 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.

Product Name

Selenium dioxide

Synthetic route

Selenium dioxide Consensus Reports

Selenium dioxide Standards and Recommendations

Selenium dioxide Specification

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