Phase changes and molecular motion in the thiourea-cyclohexane inclusion compound

Abstract

Several experimental results and discussions have previously been reported concerning the thiourea-cyclohexane inclusion compound (TCIC). They were obtained using nitrogen-14 NQR, proton wide-line NMR, relaxation time measurements, differential thermal analysis, and x ray diffraction methods. In the present paper new results of wide-line proton NMR on partially deuterated samples (thiourea-d4-cyclohexane) and a detailed interpretation of x-ray diffraction patterns are presented; the discussion leads to a better description of the behavior of the host lattice and guest molecules as the temperature of the sample is increased from −196°C to room temperature. The proposed model is also compared to that obtained for urea-trioxane, a similar inclusion compound described by the authors in an other paper.