A THIOUREA-1,5-CYCLOOCTADIENE CLATHRATE AT 173 K

The structure of the host-guest-type clathrate, thiourea-1,5-cycloocta diene (3/1) 3CH(4)N(2)S.C8H12, at 173 K, is reported. The thiourea mol ecules (host) form nearly hexagonal channels while the ordered 1,5-cyc looctadiene guest molecules occupy the channels. The channels result f rom hydrogen bonding between thiourea molecules. The channel axis is p arallel to the ac bisector. Although the guest molecules are well defi ned, there seems to be slight orientational disorder about their centr e of mass.