Hexafluoroethane is a colorless, odorless gas. It is relatively inert. The mixture is nonflammable and nontoxic, though asphyxiation may occur because of displacement of oxygen. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.
颜色/状态:
Colorless gas
溶解度:
In water, 7.78 mg/L at 25 °C
蒸汽压力:
2.51X10+4 mm Hg at 25 °C /extrapolated/
亨利常数:
20.30 atm-m3/mole
稳定性/保质期:
在常温常压下保持稳定,应避免与氧化物接触。
分解:
When heated to decomposition it emits acrid smoke and irritating vapors.
IDENTIFICATION AND USE: Perfluoroethane is a colorless gas. It is used as dielectric and coolant, aerosol propellant, refrigerant. Perfluoroethane is studied for its possible value as intravitreal tamponades in retinal surgery. HUMAN EXPOSURE AND TOXICITY: Perfluoroethane did not induce structural or numerical chromosome aberrations in human peripheral blood lymphocytes in either the non-activated or metabolically -activated test systems. The major complications in patients after vitreous surgery and one of two perfluorocarbon gases were increased intraocular pressure, which was usually transient, and gas-induced lens opacities. ANIMAL STUDIES: Acute exposure of rats to the test substance at concentrations of 20% by volume in air for 2 hours or 80% by volume in oxygen for 4 hours was not lethal and produced marginal signs of intoxication either during or after exposure or on gross pathological examination 14 days later. It did not show cardiac sensitization in beagle dogs at exposure levels of 200,000 ppm. 14-Day rat study including examination of FOB (Functional Observational Battery) and motor activity end-points, identifies a NOAEL of 50,000 ppm established based on the absence of effects in all end-points at the highest concentration tested. Perfluoroethane was not toxic in developmental studies in rats. Micronucleus evaluation from repeated inhalation exposure of male and female rats to 0, 2500, 10000, or 50000 ppm was negative.
来源:Hazardous Substances Data Bank (HSDB)
毒理性
副作用
神经毒素 - 急性溶剂综合征
Neurotoxin - Acute solvent syndrome
来源:Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
The potential of the test substance to sensitize the heart to a challenge of epinephrine injection was tested in beagle dogs. Beagle dogs received a control injection of epinephrine (0.008 mg/kg) intravenously prior to exposure and a challenge injection (same dosage) after breathing the test material for five minutes. The test substance on a volume to volume basis in air, did not produce cardiac sensitization in 12 healthy, male, beagle dogs which were tested. On the basis of this experimental study, cardiac sensitization does not appear to pose a serious hazard to mammals exposed to the test substance at a concentration of 20% or less (V/V in air), or a mixture with N2O at a concentration of 20% test substance and ~4% N2O (V/V in air).
Fifteen rabbits (30 eyes) were divided into 3 experimental groups, the contralateral eyes in same animals served as the controls. Eyes in group A and B received two vitreous injections of 15 IU of hyaluronidase at an interval of 5 d. The eyes in group C and all control eyes were injected with balanced salt solution (BSS). Seven days after injection, the experimental eyes in group A and C received 0.5 mL of C(2)F(6) injection. The ocular and retinal signs were examined for 8 following weeks and then killed for histological examination. Five eyes in group A (100.0%) showed complete separation of the vitreous cortex from the retina (PVD), three eyes in group B (60.0%) showed partial PVD, and no PVD was detected in group C and all control eyes. On electroretinogram no significant difference was found in amplitude and latency of a-(or b-) wave in both experimental and control eyes, between before and after experiments. No evidence of ocular or retinal toxicity was revealed by light or scanning electronic microscopy in all eyes. Vitreous injection of hyaluronidase combined with perfluoroethane, as a safety method, can induce posterior vitreous detachment without mechanical vitrectomy.
First Aid: If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. If frostbite has occurred, seek medical attention immediately; do NOT rub the affected areas or flush them with water. In order to prevent further tissue damage, do NOT attempt to remove frozen clothing from frostbitten areas. If frostbite has NOT occurred, immediately and thoroughly wash contaminated skin with soap and water.
Three gases, perfluoromethane, perfluoroethane, and perfluoropropane (CF4, C2F6, and C3 F8, respectively) were studied for their possible value as intravitreal tamponades in retinal surgery. The gases expand and have intraocular longevities that increase with the length of the carbon chain. A 0.4-cc injection of CF4, remained in the eye six days, twice as long as an equivalent amount of air; C2F6 remained 16 days, more than four times as long as air; and C3F8 remained 28 days, nine times as long as air and four times as long as sulfur hexafluoride.
1.周国泰,化学危险品安全技术全书,化学工业出版社,1997 2.国家环保局有毒化学品管理办公室、北京化工研究院合编,化学品毒性法规环境数据手册,中国环境科学出版社.1992 3.Canadian Centre for Occupational Health and Safety,CHEMINFO Database.1998 4.Canadian Centre for Occupational Health and Safety, RTECS Database, 1989
Observation of the nucleophilic displacement (SN2) reaction F− + CH3Br → CH3F + Br− Induced by dissociative electron capture in binary van der waals clusters
摘要:
AbstractWe report on the SN2 reaction F− + CH3Br → FCH3 + Br− in binary clusters composed of CH3Br and C2F6 in a crossed electron/molecular beam experiment. The reaction is induced by resonance dissociative electron attachment to the C2F6 component where the nucleophile F− is generated at an energy (around 3.8 eV) where CH3Br does not capture electrons to form Br−. The results indicate that the cross section for the SN2 reaction is independent of the total excess energy which can be varied between 1.7 and 5 eV in the present system.
A process for the preparation of trifluoromethyl iodide is provided. The process includes the step of contacting in a reactor a compound represented by the formula:
CF3—W
and a compound represented by the formula:
IFn
wherein W can be H, Br, Cl, COOH, COCl, COOCH3, COOC2H5, COCH3, COPh, CF3, Si(CH3)3, SPh, SCH3, SSCF3, SSPh, SSCH3, or SO2Cl, wherein n is 1, 3, 5, or 7, and wherein the step of contacting is carried out, at a temperature, pressure and for a length of time sufficient to produce trifluoromethyl iodide. The contacting step can be carried out in the presence or absence of a catalyst and the contacting step can be carried out in the presence or absence of air.
The electronic absorption spectrum of the trifluoromethyl radical
作者:N. Basco、F.G.M. Hathorn
DOI:10.1016/0009-2614(71)85015-7
日期:1971.2
An electronic absorptionspectrum in the region 165 nm to 146 nm has been assigned to the CF3 radical. The rate constant for the mutual combination of CF3 radicals at ≈ 300°K and a total pressure of 100 torr argon is ≈ 3×1012 cm3 mole−1 sec−1.
A new synthesis for methyl/trifluoromethyl organometallic compounds by low temperature cocondensation of trifluoromethyl radicals and main group methyl alkyls
The reaction of trifluoromethylradicals produced in a radio frequency discharge of hexafluoroethane with trimethylphosphine, tetramethyltin, dimethylmercury, tri-methylbismuth and tetramethyllead gave complexes with methyl and trifluoromethyl substituents. The compounds dimethyl(trifluoromethyl)phosphine, trimethyl(trifluoromethyl)tin, methyl(trifluoromethyl)mercury, bis(trifluoromethyl)mercury, dim
Synthesis of trifluoromethyl-substituted compounds
申请人:Massachusetts Institute of Technology
公开号:US03954585A1
公开(公告)日:1976-05-04
Trifluoromethyl-substituted compounds are formed in a corona discharge or glow discharge plasma of trifluoromethyl radicals from an organic trifluoromethyl source. A substrate possessing easily replaceable ligands such as halogen or carbonyl, is initially contacted either in the plasma and within a short distance from a downstream visible edge of the plasma or outside of the visible portion of the plasma and within a short distance from the downstream visible edge, to effect a substitution of the halogen or carbonyl ligand on the substrate with a trifluoromethyl radical without substantial decomposition of the substrate.
A process for production of high-purity hexafluoroethane, wherein a mixed gas containing hexafluoroethane and chlorotrifluoromethane is reacted with hydrogen fluoride in a gas phase in the presence of a fluorination catalyst at 200-450° C., for fluorination of the chlorotrifluoromethane, or wherein pentafluoroethane containing chlorine compounds with 1-3 carbon atoms is reacted with hydrogen in a gas phase in the presence of a hydrogenation catalyst at 150-400° C., and the product is then reacted with fluorine in a gas phase in the presence of a diluent gas.