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Basic Information
CAS No.: 7791-23-3
Name: SELENIUM OXYCHLORIDE
Article Data: 54
Molecular Structure:
Molecular Structure of 7791-23-3 (SELENIUM OXYCHLORIDE)
Formula: Cl2O Se
Molecular Weight: 165.865
Synonyms: Seleniumoxychloride (6CI); Dichlorooxoselenium; Seleninyl dichloride; Selenium chlorideoxide (SeCl2O); Selenium dichloride oxide; Selenium oxychloride (SeOCl2);Selenium oxydichloride; Selenyl dichloride (SeOCl2)
EINECS: 232-244-0
Density: 2.43 g/mL at 25 °C(lit.)
Melting Point: 9 °C
Boiling Point: 180 °C(lit.)
Flash Point: 176.4°C
Solubility: reacts with water
Appearance: yellow to orange liq.
Hazard Symbols: ToxicTDangerousN
Risk Codes: 14-23/25-33-35-50/53
Safety: Poison by skin contact and subcutaneous routes. Human systemic effects by skin contact with very small amounts: primary irritant, corrosive. Explodes on contact with potassium, white phosphorus. Ignites on contact with antimony. Vigorous reaction with metal oxides (e.g., silver oxide, lead(II) oxide, lead(IV) oxide, lead(II)(IV) oxide). When heated to decomposition it emits very toxic fumes of Cl and Se. See also SELENIUM COMPOUNDS and CHLORIDES.
Transport Information: UN 2879 8
PSA: 17.07000
LogP: 0.87940
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Chemistry

IUPAC Name: Selenium oxydichloride
The MF of Selenium oxydichloride (CAS NO.7791-23-3) is Cl2OSe.

                            
The MW of Selenium oxydichloride (CAS NO.7791-23-3) is 165.87.
Synonyms of Selenium oxydichloride (CAS NO.7791-23-3): Seleninyl dichloride ; Selenium chloride oxide ; Selenium oxychloride
Product Categories: Inorganics
Apperance: colourless to light yellow liquid
Stability: Stable, but reacts with water and moisture
Solubility: Decomposes in water
Sensitive: Moisture Sensitive
Refraction Index: 1.651
Boiling Point: 180 °C
Melting Point: 8.5 °C
Flash Point: 176.4 °C
EINECS: 232-244-0 
Merck: 14,8435

Uses

 Selenium oxydichloride (CAS NO.7791-23-3) is used occasionally as a polar solvent for synthetic phenolic resins, which resembles DMSO as a donor solvent.

Production

Selenium oxydichloride can be prepared by several methods:
1. by passing chlorine gas into a suspension of selenium dioxide in carbon tetrachloride.
2. by heating thionyl chloride, SOCl2, with selenium dioxide.
3. by dehydration of dichloroselenious acid, H2Se(Cl2)O2
4. by fusion of selenium dioxide, selenium and calcium chloride.

 

Toxicity Data With Reference

1.    

skn-man TDLo:710 µg/kg

    PHRPA6    Public Health Reports. 53 (1938),94.
2.    

skn-rbt LDLo:2 mg/kg

    CTOXAO    Clinical Toxicology. 17 (1980),171.
3.    

scu-rbt LD50:7 mg/kg

    CTOXAO    Clinical Toxicology. 17 (1980),171.

Consensus Reports

Selenium and its compounds are on the Community Right-To-Know List. EPA Extremely Hazardous Substances List. Reported in EPA TSCA Inventory.

Safety Profile

Poison by skin contact and subcutaneous routes. Human systemic effects by skin contact with very small amounts: primary irritant, corrosive. Explodes on contact with potassium, white phosphorus. Ignites on contact with antimony. Vigorous reaction with metal oxides (e.g., silver oxide, lead(II) oxide, lead(IV) oxide, lead(II)(IV) oxide). When heated to decomposition it emits very toxic fumes of Cl and Se. See also SELENIUM COMPOUNDS and CHLORIDES.Safety information of Selenium oxydichloride (CAS NO.7791-23-3):
Hazard Codes  ToxicT,DangerousN
Risk Statements 
14 Reacts violently with water
23/25 Toxic by inhalation and if swallowed
33 Danger of cumulative effects
35 Causes severe burns
50/53 Very Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Safety Statements 
26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36/37/39 Wear suitable protective clothing, gloves and eye/face protection
45 In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)
60 This material and/or its container must be disposed of as hazardous waste
61 Avoid release to the environment. Refer to special instructions safety data sheet
RIDADR  UN 2879 8/PG 1
WGK Germany  3
RTECS  VS7000000
HazardClass  8
PackingGroup  I

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
DOT Classification:  8; Label: Corrosive, Poison

Specification

 Selenium oxydichloride is the chemical compound SeOCl2, a close chemical relative of thionyl chloride, SOCl2.