Hydrogen bond Weak/strong

Scatena, L. F., Brown, M. G. and Richmond, G. L. (2001) Water at hydrophobic surfaces weak hydrogen bonding and strong orientation effects. Science, 292, 908-912. 

Figure 11. Crystal structure of morellic add, 15 in its 1 1 complex with pyridine. Hydrogen bonds a (strong) and b through g (weak) are marked. The pyridine molecule assists in assembling the structure.

Incidentally, it seems that weak acids, eg, hydrazoic, nitrophenols and nitroanilines (note their large values of the specific heats of sublimation in Table 6) tend to form intermolecular hydrogen bonds, whereas strong acids, as discussed above, do not... 

Weak hydrogen bond interaction Strong electrostatic interaction... 

In connection with the possibility that the hydrogen bonds in water need not be linear, Yamatera, Fitzpatrick, and Gordon (160) proposed that the weak interactions observed in their spectra may correspond to considerably bent hydrogen bonds, while strong hydrogen bonds correspond to the more nearly ideal hydrogen bonds. These authors also note the study by Lippincott, Weir, and van Valkenburg (97), who sug-... 

Isotropic H chemical shifts for weakly hydrogen bonded hydrates have recently been compared [81] with previous data on carboxylic acids with O-H 0 hydrogen bonds of strong and medium strengths. The values of SH for the hydrogen bonded protons in this work varied from 4.8 ppm in NaCl04-H20 to 20.5 ppm in potassium hydrogen malonate. 

Hydrogen bonding occurs between H+ and ions of high electronegativity, such as F, O2-, and N3-. The hydrogen bond is essentially a weak electrostatic bond and is important in crystal structures of oxy compounds, such as the layer silicates. Summed over many atoms, the individually weak hydrogen bonds can strongly bond adjacent structures. 

In addition to these diffusion studies, various recent spectroscopic studies (e.g. Eckert et al. 1987, Richet and Polian 1998, Zarubin 1999) reveal that weak hydrogen bonding with strong dynamics even at lower temperatures is a characteristic of silicate melts. Although such dynamics are unlikely to cause translational diffusive motion directly (e g. Helmich and Rauch 1993), they can modify the nature of speciation reactions and thereby influence diffusion (e.g. see Behrens and Nowak 1997, Doremus... 

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