SOLID-STATE H-2 NMR-STUDIES OF GUEST MOLECULAR-DYNAMICS IN THE BENZENETRICARBONYLCHROMIUM-THIOUREA INCLUSION COMPOUND

The dynamics of the benzene moiety of perdeuterated benzenetricarbonyl chromium (eta(6)-C6D6)Cr(CO)(3) guest molecules in their thiourea incl usion compound, investigated by H-2 NMR spectroscopy, are described by in-plane nearest neighbour 2 pi/6 jumps; the activation energy for th is motion (20.2 kJ mol(-1) from H-2 NMR lineshape analysis and 19.8 kJ mol(-1) from H-2 NMR spin-lattice relaxation time measurements) is hi gher than that for the corresponding motion in the pure crystalline ph ase of perdeuterated benzenetricarbonylchromium.