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  2. Intermolecular force - Wikipedia

    en.wikipedia.org/wiki/Intermolecular_force

    The attractive force draws molecules closer together and gives a real gas a tendency to occupy a smaller volume than an ideal gas. Which interaction is more important depends on temperature and pressure (see compressibility factor). In a gas, the distances between molecules are generally large, so intermolecular forces have only a small effect.

  3. Crystal engineering - Wikipedia

    en.wikipedia.org/wiki/Crystal_engineering

    Example of the strongest (hydrogen bonds) and weakest (van der Waals) interactions in acetaminophen structure that influences the crystal structure. A supramolecular synthon is a pair of molecules that form relatively strong intermolecular interactions in the early phases of crystallization ; these molecule pairs are the basic structural motif ...

  4. London dispersion force - Wikipedia

    en.wikipedia.org/wiki/London_dispersion_force

    Interaction energy of an argon dimer.The long-range section is due to London dispersion forces. London dispersion forces (LDF, also known as dispersion forces, London forces, instantaneous dipole–induced dipole forces, fluctuating induced dipole bonds [1] or loosely as van der Waals forces) are a type of intermolecular force acting between atoms and molecules that are normally electrically ...

  5. Non-covalent interaction - Wikipedia

    en.wikipedia.org/wiki/Non-covalent_interaction

    Non-covalent interactions can be classified into different categories, such as electrostatic, π-effects, van der Waals forces, and hydrophobic effects. [ 3 ] [ 2 ] Non-covalent interactions [ 4 ] are critical in maintaining the three-dimensional structure of large molecules, such as proteins and nucleic acids .

  6. Van der Waals equation - Wikipedia

    en.wikipedia.org/wiki/Van_der_Waals_equation

    The intermolecular force was later conveniently described by the negative derivative of a pair potential function. For spherically symmetric particles, this is most simply a function of separation distance with a single characteristic length, σ {\displaystyle \sigma } , and a minimum energy, − ε {\displaystyle -\varepsilon } (with ε ≥ 0 ...

  7. Van der Waals force - Wikipedia

    en.wikipedia.org/wiki/Van_der_Waals_force

    Van der Waals forces are often among the weakest chemical forces. For example, the pairwise attractive van der Waals interaction energy between H atoms in different H 2 molecules equals 0.06 kJ/mol (0.6 meV) and the pairwise attractive interaction energy between O atoms in different O 2 molecules equals 0.44 kJ/mol (4.6 meV). [9]

  8. Noble gas - Wikipedia

    en.wikipedia.org/wiki/Noble_gas

    The intermolecular force between noble gas atoms is the very weak London dispersion force, so their boiling points are all cryogenic, below 165 K (−108 °C; −163 °F). [ 2 ] The noble gases' inertness , or tendency not to react with other chemical substances , results from their electron configuration : their outer shell of valence ...

  9. Compressibility factor - Wikipedia

    en.wikipedia.org/wiki/Compressibility_factor

    Deviations of the compressibility factor, Z, from unity are due to attractive and repulsive intermolecular forces. At a given temperature and pressure, repulsive forces tend to make the volume larger than for an ideal gas; when these forces dominate Z is greater than unity. When attractive forces dominate, Z is less than unity.

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