Schichteinlagerungsverbindungen des Niob- und Tantaldisulfids mit n-Alkylaminen / Layer Intercalation Compounds of Niobium and Tantalum Disulfide with n-Alkylamines

NbS2 and TaS2 react with n-alkylamines to form intercalation complexes similar to those observed with TiS2. The arrangement of the guest molecules in the interlayer space is dominated by the interaction host lattice-amine nitrogen, if the alkyl chain of the amine contains 4 to 9 C-atoms. In complexes containing 12 to 18 C-atoms per alkyl chain, the van der Waals interaction between the alkyl chains is essentially responsible for the sterical arrangement of the intercalated molecules. Investigations with n-octadecylamine-NbS2 and oleylamine-NbS2 in the temperature range of 20-120°C lead to the observation of severval reversible phase transitions. These transitions are caused by conformational changes of the guest molecules as well as by changes in the ratio RNH2: NbS2.