A thermochemical investigation of guest-host interactions in labile Werner clathrates of the [Ni(4-EtPy)4(NCS)2]·G type (G = methyl derivatives of benzene)

Article abstract of DOI:10.1016/S0040-6031(96)03082-1

The stoichiometry of thermal decomposition has been studied for (I): [Ni(4-EtPy)₄(NCS)₂] as a host complex as well as for its clathrates [Ni(4-EtPy)₄(NCS)₂]·G where guest molecule G - toluene, (II): T, (III): o-xylene (o-X) and (IV): p-xylene (p-X). The loss of volatile components proceeds in three steps (-2L, -1L, -1L) for I and in four steps (-G, -2L, -1L, -1L) for II, III and IV. DSC and X-ray powder measurements indicated a phase transition in all compounds under study. However, this process is overlapped by the escape of G in II and III. The differences in enthalpy changes are associated with different guest-host interactions in the particular clathrates.