S. Kabuß

Konformative beweglichkeit flexibler ringsysteme. Untersuchungen mit hilfe der protonenresonanz-spektroskopie—VI. Mitteilung: Eine erweiterung und verfeinerung des verfahrens zur bestimmung der aktivierungsenergie

Abstract The methods to evaluate the lifetime of conformative molecular states by measurementsof the temperature dependence of proton resonance, have been refined and extended. For this purpose, the apparent line width is divided into two components, the temperature dependence of each being studied. It is shown, that also that part of the total line width which is not influenced by the exchange, the “Eigenbreite”, depends on temperature. The temperature dependence of the “Eigenbreite” has to be considered when using the various methods for the determination of τ, especially when the “Eigenbreite” is relatively large compared to the chemical shift. The efficiency of the method is demonstrated for some examples, i.e. ring compounds, for which the proton resonance signals of two pairs of geminal ligands, on different places in the ring system, can be analysed separately.