Hydrogen bonds strength

Thermochemistry. Thermodynamic considerations ate of utmost importance in fluorinations. Table 1 is based on JANAF data (25) for CH, which indicate an average carbon-hydrogen bond strength of 410.0 kj/mol (98 kcal/mol) based on the atomization energy of CH. ... 

It will be noted that as the hydrogen bond strength increases, Py (H2O) > Py(CH2Cl2) > Py(CHCl3), the relative intensity ratio of the two ring modes increases and they may be used to assess the strength of the hydro-... 

For reviews of the relationship between hydrogen bond strength and acid-base properties, see Pogorelyi, V.K. Vishnyakova, T.B. Russ. Chem. Rev, 1984, 53, 1154 Epshtein, L.M. Russ. Chem. Rev, 1979, 48, 854. 

Because of the exposed histidine ligands of the [2Fe-2S] cluster, the Rieske is capable of binding quinones in a redox-dependent manner. The variation of the hydrogen bond strength and of the electrostatic properties will control the movement of the catalytic domain of the Rieske protein. Therefore, the function depends on the unique structural and electrochemical properties of the Rieske cluster. 

Infrared Hydroxyl Absorption Bands and Hydrogen-bonding Strength (Xv cm ) for Various Sugars and Their Relative Sweetness ... 

Raevsky, 0. A. Hydrogen bond strength estimation by means of HYBOT. In Computer-Assisted Lead Finding and Optimization, Van de Waterbeemd, H., Testa, B., Folkers, G. (eds.), Wiley-VGH, Weinheim, 1997, pp. 357-378. 

Kumar, G. A., McAllister, M. A., 1998, Theoretical Investigation of the Relationship Between Proton NMR Chemical Shift and Hydrogen Bond Strength , J. Org. Chem., 63, 6968. 

Cser A, Nagy K, Biczok L (2002) Fluorescence lifetime of Nile red as a probe for the hydrogen bonding strength with its microenvironment. Chem Phys Lett 360(5-6) 473-478... 

Raevsky, O., Hydrogen bond strength estimation by means of the HYBOT program package, in Computer-assisted lead finding and optimization, H. van de Waterbeemd, B. Testa and G. Folkers, eds, Verlag Helvetica Chimica Acta, Basel, 1997, 367-378. 

MolSurf parameters [33] are descriptors derived from quantum mechanical calculations. These descriptors are computed at a surface of constant electron density, with which a very fine description of the properties of a molecule at the Van der Waals surface can be obtained. They describe various electrostatic properties such as hydrogen-bonding strengths and polarizability, as well as Lewis base and acid strengths. MolSurf parameters are computed using the following protocol. 

Hydrogen bonding is a special type of acid-base interaction (see Chapter 9). Probably the most important equation relating hydrogen bond strengths is the equation known as the Drago four-parameter equation,... 

---