Tropolone molecule, hydrogen bonds

The timescale of a microwave observation is ca 10 12s so that an average of the properties of the species in equilibrium (35) is obtained if the equilibrium occurs in a time shorter than this. The X-ray photoelectron spectra of intramolecularly hydrogen-bonded species in the gas phase have been studied in an attempt to obtain an instantaneous picture of the structure of these molecules. In this technique the ionisation of core electrons which occurs within 10 16s is observed. For malondialdehyde, 6-hydroxy-2-formyl-fulvene, 2-hydroxy-1,1,1,5,5,5-hexafluoropent-2-ene-4-one, 9-hydroxyphen-alenone [19], and tropolone [20], two peaks are observed in the Ou region of the photoelectron spectrum (Brown et al., 1979). If these molecules existed in the C2v form with a symmetrical hydrogen bond and equivalent oxygen... 

Figure 14 A cartoon representation of tropolone methyl ether and norephedrine included within a supercage under wet and dry conditions. The model helps to rationalize the difference in ee obtained under the two conditions. Dark circles represent the cations. Hydrogen bonding between the chiral inductor and interaction between the cation and TME are disturbed by water molecules.

Coherent Proton Tunneling in Hydrogen Bonds of Isolated Molecules Malonaldehyde and Tropolone... 

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