Hydrogen bonding and molecular

As mentioned above, hydrogen bonding and molecular size, in combination with lipophilicity have an important influence on oral absorption. A number of methods are available to compute these properties. A further example of the correlation between H-bonding, expressed as polar surface area, is found in Figure 3.12 [24,25]. Such a sigmoidal relationship is found for compounds which are absorbed by passive diffusion only and not hindered by efflux or metabolism, and which are not involved in active uptake. Otherwise deviations will be foimd [25]. 

Considerable interest has also been shown in the NH vibrational modes, particularly in connection with hydrogen bonding and molecular association. The frequency and integrated intensity of the NH stretching vibration in nonpolar solvents relative to that observed in the vapor phase is consistent with the Kirkwood-Bauer-Magat relationship,105, 347 but where a strong interaction exists between the solvent and the pyrrole molecule a large deviation from the expected value occurs (see Section II, B). 

Taft, R., M. Berthelot, C. Laurence, and A. Leo. 1996. Hydrogen Bonds and Molecular Structure. 

Chang SK et al (1991) Hydrogen-bonding and molecular recognition - synthetic, complex-ation, and structural studies on barbiturate binding to an artificial receptor. J Am Chem Soc 113 7640-7645... 

Kulicke and Nottelmann (1989) divided gels into three generic classes, viz., physical, ionotropic, and covalent. Physical gels are held together by hydrogen bonds and molecular entanglements they expand when hydrated and contract when dehydrated to Silberberg (1989) they are swollen me-... 

The section on solubility has been expanded to emphasize the role of hydrogen bonding and molecular size in the role of water solubility of organic molecules. 

K. B. Borisenko, C. W. Bock, I. Hargittai, Intramolecular Hydrogen Bonding and Molecular Geometry of 2-Nitrophenol from a Joint Gas-Phase Electron Diffraction and Ab Initio Molecular Orbital Investigation. J. Phys. Chem. 1994, 98, 1442-1448. 

Kroon-Batenburg, L. M. J., Hydrogen Bonding and Molecular Conformation, Ph.D. Thesis, Utrecht, 1985. 

Kojic-Prodic, B., Stefanic, Z., and Zinic, M., Hydrogen bonding and molecular assemblies, Croat. Chem. Acta, 77, 415 25 (2004). 

Okuyama, M., and Ikawa, S.-I., Intramolecular hydrogen bond and molecular conformation. Part 3—effect of temperature and pressure on the IR spectra of o-halophenols in dilute solutions, J. Chem. Soc. Faraday Trans., 90, 3065-3069 (1994). 

Many semisolid food materials portray yield stress. The yield stress in polysaccharide dispersions results from intermolecular hydrogen bonding and molecular entanglements (Gencer, 1985). A precise quantitative knowledge of yield stress is necessary since it is very important in pumping operations, stability of suspensions, appearance of coated materials, and consumer acceptability (Kee and Duming, 1990). 

Meyer, M., Wilson, E, and Schomburg, D. (1996). Hydrogen bonding and molecular surface shape complementarity as a basis for protein docking./. Mol. Biol. 264, 199-210. 

Lagodzinskaya GV, Yunda NG, ManeUs GB (2002) H + -catalyzed symmetric proton exchange in neat liquids with a network of N-H-N and O-H-O hydrogen bonds and molecular mechanism of Grotthus proton migration. Chem Phys 282 51-61 Lamb WJ, Brown DR, Jonas JJ (1981) Temperature and density dependence of the proton lifetime min liquid water. Phys Chem 85 2883-1887... 

Hydrogen Bonding and Molecular Packing in Multi-functional Crystal... 

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