Hydrogen Bond Research by Peter Schuster, Peter Wolschann (auth.), Prof. Dr. Peter

By Peter Schuster, Peter Wolschann (auth.), Prof. Dr. Peter Schuster, Prof. Dr. Werner Mikenda (eds.)

Seven evaluate articles and unique papers supply a consultant evaluation of the learn paintings performed in hydrogen bond examine at Austrian universities. the subjects lined by means of the contributions are: cutting-edge of realizing hydrogen bonding in biopolymers; fresh NMR suggestions for learning hydrogen bonding in aqueous suggestions; intramolecular hydrogen bonding and proton move in a category of Mannich bases derived from substituted phenols and naphthols; festival among intramolecular hydrogen bonds in ortho-disubstituted phenols; molecular dynamic simulations on proton move in 5,8-dihydroxynaphthoquinone and within the formic acid dimer; actual calculations of the intermolecular interactions in cyanoacetylen dimers; correlation among OH...O bond distances and OH stretching frequencies as derived from structural and spectroscopic info of minerals.

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9). O pH Fig. 8. Intermolecular exchange profile of R2'-OH in methylcobalamin [45-47]. The exchange rates kex are given in S-I; solid curves were drawn using Eg. (9). NMR solutions: 10 mM solutions. 7 em', buffered with 8 mM. 10 mM. 15 mM. 40 mM. 70 mM and 100 mM phosphate buffer solutions. 0, as well as IO mM solutions. 7 em'. 6: 26 c C. Intermolecular exchange rates (kexl were determined from selective TTmeasurements based on the equation IIT1 = lIT1 (dipolarJ+k ex ' Selective RF pulses: excitation: 30 ms 270 Gaussian excitation pulse [53]: inversion: 50 ms G3 Gaussian cascade [54].

Exchange of the peptide amide proton with solvent protons can only occur in the open state, in which the hydrogen bond has been broken. In the closed state, the proton is still involved in the hydrogen bond and cannot form the rate-limiting hydrogen bond to the exchange catalyst. However, the open state can differ from the closed state by more than the hydrogen bond alone. As examples, neighbouring secondary structure segments may unfold in a cooperative manner or, alternatively, the open state can be differently stabilized by additional favourable interactions.

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