Weak hydrogen bonds spectroscopy

If ultrafast nonlinear vibrational spectroscopy [1-3] has recently developed into an important tool providing original informations on the dynamics of weak hydrogen bonds (H-bonds), the simpler linear infrared (IR) vs(X—H) absorption spectroscopy spectra remains, however, to be an important method for the understanding of this dynamics. Considerable experimental and theoretical works have been done in this last field [4—17]. 

The conformations of bufotenine and psilocin in solution have been studied by 360 MHz H n.m.r. spectroscopy.166 Bufotenine adopts preferentially a staggered conformation in deuteriochloroform, whereas psilocin exists mainly in the gauche conformation, presumably owing to weak hydrogen-bonding of the 4-hydroxy-group with the basic nitrogen atom. 

A. Fujii, T. Ebata, and N. Mikami, Direct observation of weak hydrogen bonds in micro-solvated phenol infrared spectroscopy of OH stretching vibrations of phenol-CO and -CO2 in So and Do, J. Phys. Chem. A 106, 10124-10129 (2002). 

Inclusion Compounds Selectivity, Thermal Stability, and Kinetics, p. 696 Liquid. Clathrates, p. 804 Supramolecular Electrochemistry, p. 1412 Vibrational Spectroscopy, p. 1557 Weak Hydrogen Bonds, p. 1576... 

The weak hydrogen bonds are studied by various methods. Experimentally, spectroscopy and crystallography are most often used. Formation constants or thermal properties of an interacting system also provide useful information. Conformational analyses of appropriate molecules may provide information, though indirect, for the weak... 

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