Structural and Kinetic Study of Inclusion of Amines by a Bis-Fluorenol Host

The host compound H = 9,9‘-(biphenyl-4,4‘-diyl)difluoren-9-ol forms inclusion compounds with ethylamine (H·ETHYL and H·2ETHYL) and propylamine (H·2PROPYL). Thermal analysis of these compounds has been carried out, and the structures of H·2ETHYL and H·2PROPYL have been elucidated and were found to be stabilized by (host)−O−H···N−(guest) intermolecular hydrogen bonds. The kinetics of enclathration with both ethylamine and propylamine vapor were studied and were found to display anti-Arrhenius behavior. In addition, the kinetics of desorption of each of the inclusion compounds were measured and the activation energies of the desorption processes were found to be in the range 103.1 to 159.6 kJ mol-1.