STUDIES IN WERNER CLATHRATES .14. ANALYSIS OF THE PROPERTIES SELECTED FOR BY THE HOST BIS(ISOTHIOCYANATO)-TETRA(4-VINYLPYRIDINE)NICKEL(II)

The thermal characteristics of seven crystals with [Ni(NCS)2(vpy)4] (vpy = 4-vinylpyridine) as host were analysed by thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). No preferential guest loss for the clathrates with pairs of guests was observed. The enthalpy of the 'guest release reaction' for each clathrate was obtained from the DTA experiments. Solubility studies of the host were performed in the same guest solvents in order to obtain a better understanding of the clathration process. The results show that the basis of the selection of the host for guest molecules is related to solubility.