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Related Concept Videos

Formation of Halohydrin from Alkenes02:41

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An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
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Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
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Perfluorinated alkyl groups induce unexpected hydrophobic hydration structure.

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Perfluorination alters ethanol

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Area of Science:

  • Physical Chemistry
  • Solution Chemistry
  • Spectroscopy

Background:

  • Perfluorination of ethanol's methyl group impacts water mixing thermodynamics.
  • Understanding these differences is crucial for predicting solubility of fluorinated compounds.

Purpose of the Study:

  • To investigate the structural and thermodynamic origins of differing mixing behaviors between ethanol (EtOH) and 2,2,2-trifluoroethanol (TFE) in water.
  • To elucidate the role of hydrogen bonding and collective vibrational modes.

Main Methods:

  • Terahertz (THz) spectroscopy to probe solution dynamics.
  • Molecular dynamics simulations to analyze structure and hydrogen bonding.

Main Results:

  • THz spectra revealed distinct entropy- and enthalpy-related features linked to water-water and water-solute hydrogen bonds.
  • TFE solutions showed a red-shift in the entropy peak, indicating weaker water-water hydrogen bonds in the solvation shell.
  • Simulations identified three key effects influencing mixing thermodynamics: altered water-water hydrogen bonding, differential perturbation of water molecules, and varying solute-water hydrogen bond strength.

Conclusions:

  • Hydrophobic solvation of perfluorinated groups differs significantly from alkylated groups.
  • The study provides insights into the fundamental interactions governing the solubility of perfluorinated molecules.