Conformational polymorphs of 1,1,2,2-tetrachloroethane: pressure vs. temperature.
نویسندگان
چکیده
Directional Cl···Cl type I and II interactions govern the low-density aggregation of 1,1,2,2-tetrachloroethane molecules in synclinal conformation in the crystalline state at low temperature, whereas the dense molecular packing in high-pressure is achieved for the antiperiplanar conformers and electrostatically less favored Cl···Cl contacts. The mechanism of transformation between loose and dense associations involves the collapse of Cl···Cl contacts and conformational conversion.
منابع مشابه
NTP technical report on the toxicity studies of 1,1,2,2-tetrachloroethane (CAS No. 79-34-5) administered in microcapsules in feed to F344/N rats and B6C3F1 mice.
BACKGROUND 1,1 ,2,2-Tetrachloroethane was widely used in the production of solvents and pesticides. Its production ended in the 1990s, but it is a major component of waste sites. We studied the effects of 1,1 ,2,2-tetrachloroethane on male and female rats and mice to identify potential toxic hazards to humans. METHODS Because 1,1,2,2-tetrachloroethane can evaporate easily, we enclosed it in s...
متن کامل2. Relevance to Public Health 2.1 Background and Environmental Exposures to 1,1,2,2-tetrachloro Ethane in the United States
1,1,2,2-Tetrachloroethane is currently used as a chemical intermediate in the production of chlorinated hydrocarbons. In the past, this substance was used as an industrial solvent and extractant and was even a component of a few pesticide formulations; however, its manufacture and use as an end-product appears to have ceased in the United States. Present sources of 1,1,2,2-tetrachloroethane are...
متن کاملDechlorination of lindane, dieldrin, tetrachloroethane, trichloroethene, and PVC in subcritical water.
Pure water has been used to dechlorinate aliphatic organics without the need for catalysts or other additives. Dehydrohalogenation (loss of HCI with the formation of a double bond) occurred at temperatures as low as 105-200 degrees C for 1,1,2,2-tetrachloroethane, lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma-isomer), and dieldrin (1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahy...
متن کاملThermodynamics of Host–Guest Interactions between Fullerenes and a Buckycatcher
(1)H NMR and isothermal titration calorimetry (ITC) experiments were employed to obtain reliable thermodynamic data for the formation of the 1:1 inclusion complexes of fullerenes C(60) and C(70) with the buckycatcher (C(60)H(28)). NMR measurements were done in toluene-d8 and chlorobenzene-d5 at 288, 298, and 308 K, while the ITC titrations were performed in toluene, chlorobenzene, o-dichloroben...
متن کاملEnhancement of BALB/c 3T3 cells transformation by 1,2-dibromoethane promoting effect.
Two of the most representative halogenated aliphatic hydrocarbons, 1,2-dibromoethane and 1,1,2,2-tetrachloroethane, were tested in the two-stage cell transformation model for analysing the promoting ability. Both of these compounds had previously been found to exert genotoxic effects, probably acting as moderate initiators. BALB/c 3T3 cells were initiated with subtransforming doses of N-methyl-...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Chemical communications
دوره 47 31 شماره
صفحات -
تاریخ انتشار 2011