Do strong ionically attracted molecules have stronger intermolecular forces than hydrogen bonding forces?

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  • $\begingroup$ Have a look at @chemistry department/Elmhurst College/hydrogen bonding. The hydrogen bond is usually considered stronger than normal dipole forces between molecules. The normal hydrogen bond is about 1/10 as strong as a normal covelant bond. $\endgroup$ – Technetium Nov 30 '15 at 2:45
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    $\begingroup$ Please clarify what you mean by ionic bonding! If it is Coulomb interaction between monopoles, it is far stronger than H bonding $\endgroup$ – Greg Nov 30 '15 at 17:31
  • $\begingroup$ Question is about ionic interactions between charged molecules, like tetramethylamonium acetate imo. @anna Could you confirm it? $\endgroup$ – Mithoron Nov 30 '15 at 19:38
  • $\begingroup$ a molecule is "An electrically neutral entity..." goldbook.iupac.org/M04002.html $\endgroup$ – DavePhD Nov 30 '15 at 19:41
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    $\begingroup$ @Mithoron I think the question is unclear as to whether it is asking about a force between separate ions (ionic bonding) or between charged portions of molecules, as in intermolecular salt bridges. en.wikipedia.org/wiki/Salt_bridge_(protein_and_supramolecular) $\endgroup$ – DavePhD Nov 30 '15 at 20:48

Hydrogen bonds are the strongest intermolecular forces. Stronger than van der Waals' forces, namely (ordained by strength):

  • Permanent dipole - permanent dipole (Keesom's Force);
  • Permanent dipole - induced dipole (Debye force);
  • induced dipole - induced dipole (London's dispersion force);

Strong hydrogen bonds are created by the FONs (fluorine, Oxygen and Nitrogen), which are very electronegatives, what produces a strong attraction between one them and hydrogen (which is less electronegative). As example of this interaction we can cite the water, that's a polar molecule in a "V" shape, take a look at the figure below.

Then, the both hydrogens yields a $\delta^{+}$ that's attracted by the Oxygen (very strong electronegative, the $\delta^{-}$ side) of the another water molecule, yielding the hydrogen bonds, take a look at the figure below.

hydrogen bonds in water.

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  • $\begingroup$ Hydrogen bonding , an interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons. Such a bond is weaker than an ionic bond or covelant bond but stronger than van der Waals forces.(Ref:@Brittanica/hydrogen bonding). Ionic bond and van der Waals forces are both similar regarding electrostatic attraction but are describing different things specifically. $\endgroup$ – Technetium Nov 30 '15 at 7:09
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    $\begingroup$ Won't lie... I thought your oversized water diagram was going to be a picture of a Voltorb. In all seriousness though, you might consider removing it, since the more reasonably sized picture below also seems to demonstrate what you were talking about, or at least try resizing it. $\endgroup$ – ringo Nov 30 '15 at 8:11
  • $\begingroup$ Thank you for the suggestion @ringo! I'll try to resize this! :) $\endgroup$ – Herr Schrödinger Nov 30 '15 at 13:29
  • $\begingroup$ I edited your answer to remove some errors you can revet some of the changes if you disagree. vdW doesn't mean ionic - question is about ionic interactions between charged molecules, like tetramethylamonium acetate also @Greg $\endgroup$ – Mithoron Nov 30 '15 at 19:34

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