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Related Concept Videos

Physical Properties of Alkanes02:33

Physical Properties of Alkanes

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Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
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Structure and Bonding of Alkenes02:47

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Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
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Transferable Anisotropic Mie Potential Force Field for Alkanediols.

Maximilian Fleck1, Samir Darouich1, Niels Hansen1

  • 1Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany.

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|May 6, 2024
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Summary
This summary is machine-generated.

This study extends the transferable anisotropic Mie (TAMie) potential to alkanediols, accurately predicting phase equilibrium and viscosity. The force field balances intra- and intermolecular hydrogen bonds for polyfunctional molecules.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Physical Chemistry

Background:

  • Developing accurate force fields for polyfunctional molecules like alkanediols is challenging due to competing intra- and intermolecular hydrogen bonds.
  • Understanding molecular conformations in gas versus liquid states is crucial for accurate simulations.

Purpose of the Study:

  • To extend the transferable anisotropic Mie (TAMie) potential to model 1,n-alkanediols.
  • To develop accurate force field parameters for alkanediols by balancing hydrogen bonding interactions.

Main Methods:

  • Applied transferable anisotropic Mie (TAMie) potential parameters from 1-alcohols to 1,5-pentanediol and longer alkanediols.
  • Parameterized intramolecular dihedral energy functions and charge-charge interactions to balance hydrogen bonding.
  • Utilized a charge group approach for evaluating interactions within and between functional groups.

Main Results:

  • Achieved good agreement with experimental phase equilibrium data for longer alkanediols.
  • Successfully reproduced experimental trans-gauche ratios for 1,2-ethanediol and 1,3-propanediol by balancing hydrogen bonding.
  • Demonstrated that nonbonded parameters from 1-alcohols can be applied to alkanediols without further refinement.

Conclusions:

  • The extended TAMie potential accurately models alkanediols, capturing essential conformational preferences and phase behavior.
  • The developed force field provides a reliable tool for simulating polyfunctional molecules, crucial for understanding their physical properties.