| Identification | Back Directory | [Name]
dichlorine oxide | [CAS]
7791-21-1 | [Synonyms]
Chloroxydul
dichlorine oxide
dichloridooxygen
Chlorine monoxide.
Dichlorine monooxide | [EINECS(EC#)]
232-243-5 | [Molecular Formula]
Cl2O | [MOL File]
7791-21-1.mol | [Molecular Weight]
86.91 |
| Chemical Properties | Back Directory | [Melting point ]
-120.6° | [Boiling point ]
bp 2.2° | [density ]
1.549 (estimate) | [solubility ]
very soluble in H2O | [form ]
yellow-brown gas | [color ]
yellow-brown | [Water Solubility ]
1 volume of water dissolves more than 100 volumes (0°C); saturation solubility is 143.6g/100g H2O (?9.4°C) [MER06] [KIR78] | [EPA Substance Registry System]
Chlorine monoxide (7791-21-1) |
| Hazard Information | Back Directory | [Chemical Properties]
yellowish brown gas; disagreeable penetrating odor; explodes on contact with organic matter; decomposes at a moderate rate at room temp; anhydride of hypochlorous acid; Henry’s constant at 3.46°C is 14.23kPa/(molarity); enthalpy of vaporization 25.9kJ/mol; can be prepared by reacting Cl2 with HgO; used as an intermediate in manufacture of calcium hypochlorite and in sterilization; reacts with a variety of organic compounds [MER06] [KIR78] | [Uses]
Chlorinating agent. | [General Description]
Red-yellow gas. Very reactive and unstable. Unusually stored as hydrate in frozen form. Used as a wood bleach, biocide and swimming pool treatment. | [Air & Water Reactions]
Decomposes in water forming chlorine and oxygen gases. | [Reactivity Profile]
Explodes when heated or by reaction with organic materials, including: carbon, carbon disulfide, ethers, hydrocarbons, dicyanogen, any readily oxidizable materials (ammonia, potassium, arsenic, antimony, sulfur, mercury sulfide, calcium phosphide, phosphine, phosphorus, hydrogen sulfide, antimony sulfide, barium sulfide, mercury sulfide, and tin sulfide). Dissolves in alkalis, forming a mixture of chlorite and chlorate. Concentration of gas should be limited to less than 10% to reduce explosion hazard. Alcohols are oxidized explosively. | [Physical properties]
Yellowish-brown gas; disagreeable suffocating odor; unstable at room temperature; gas density 3.89 g/L at 0°C; condenses to a reddish brown liquid at 2.2°C; freezes at -20°C; highly soluble in water; also soluble in alkalis, sulfuric acid, and carbon tetrachloride. | [Definition]
An
orange gas made by passing chlorine over
mercury(II) oxide. It is a strong oxidizing
agent and dissolves in water to give chloric(
I) acid. | [Preparation]
Chlorine monoxide is prepared by passing chlorine gas over yellow mercuric oxide. It is stored below -80°C as a liquid or solid. | [Hazard]
Although a nonflammable gas, it reacts explosively with many substances, including organics, metals, metal sulfides, sulfur, phosphorus, nitric oxide, ammonia, carbon disulfide, metal hydrides, and charcoal. It is a severe irritant to the eyes, nose, skin, and respiratory tract. Inhalation of the gas at 100 ppm can be fatal to humans. | [Health Hazard]
Chlorine monoxide is severely irritating tothe eyes, skin, and mucous membranes.Exposure can cause lung damage. LC50 dataare not available for this compound. Ashort exposure to 100 ppm concentration cancause death to humans. | [Fire Hazard]
Nonflammable gas. Chlorine monoxide is a
highly reactive compound, exploding by itself when rapidly heated. Chlorine monoxide
explodes with organic compounds, charcoal,
metals, metal sulfides, sulfur, phosphorus,
ammonia, nitric oxide, and carbon disulfide. |
| Questions And Answer | Back Directory | [Reactions]
The oxidation state of chlorine is +1. The compound is highly unstable, decomposing to chlorine and oxygen when exposed to light, heat, spark, or under catalytic conditions. It reacts with hot water forming hypochlorous acid:
Cl2O + H2O → 2HOCl
It oxidizes a number of compounds, undergoing violent decomposition. It reacts with metals under controlled conditions, forming their hypochlorites.
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