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Stability of Hydrogen Bonds

A.J.C. Cabeza, G.M. Day, W.D.S. Motherwell, W. Jones, Importance of molecular shape for the overall stability of hydrogen bond motifs in the crystal structures of various carbamazepine-type drug molecules, Cryst. Growth Des. 7 (2007) 100-107. [Pg.388]

J. A. Schellman. The stability of hydrogen-bonded peptide structures in aqueous solution. C. R. Trav. Lab Carlsberg Ser. Chim., 29 230-259, 1955. [Pg.304]

A topic related to that of the gas-phase acidities of phenols is the quest for quantitative data on the thermodynamic stability of hydrogen-bonded complexes, or clusters , [ArO-H X ] and [ArO H-X] between phenols and various anions derived from other Brpnsted acids. The thermodynamics of cluster formation of the phenolate ion [1 — H] with water, ethanol and acetic acid have been determined by using a pulsed electron-beam mass spectrometer and their stability was found to increase with the gas-phase acidity of the Br0nsted acid. For example, association of [1 — H] with H2O is much weaker. A// = —15.4 kcalmor , than that of [1 — H] with CH3COOH, AHq = —27.4 kcalmor The association enthalpy of the complex of phenol and fluoride ion, [1 F ], has been measured to be A//° = —41.3 kcalmor , much stronger than... [Pg.312]

Y. Dimitrova, Theoretical study of structures and stabilities of hydrogen-bonded phenol-water complexes, J. Mol. Struct. (Theochem) 455, 9-21 (1998). [Pg.48]

Gas-phase studies have been made to gain information about the intrinsic stability of hydrogen-bonded ionic intermediates of alcohols and carbon acids. Many anionic hydrogen-bonded complexes appear to be better when there is a good match of the gas-phase acidities of a neutral and the conjugate acid of the ion. [Pg.580]

Wang D, Chen K, Dimartino G, Arora PS (2006) Nucleation and stability of hydrogen-bond surrogate-based a-helices. Org Biomol Chem 4 4074 1081... [Pg.229]

Eblinger, F. Schneider, H.-J. Stabilities of hydrogen-bonded supramolecular complexes with various numbers... [Pg.815]

By employing IGC, it is possible to test donor-acceptor molecular complexes and the stability of hydrogen bonds. [Pg.1223]

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