Cucurbituril as a Host Molecule for the Complexation of Cations and Acetamide in Aqueous Solution

Mixed ligand complexes of Cobalt and Nickel with acetamide and cucurbituril as host molecule were prepared and characterized using UV-Visible, IR and XRD techniques. These mixed ligand complexes are quite stable and this stability was largely attributed to the strong interaction of carbonyl oxygen donor atoms of cucurbituril with the cations. From the increase in absorbance in UV-Visible region the interaction between metal and host molecule was proved. The IR spectra showed significant variations, especially in 3500cm^-1 region and between 1700 and 1200cm^-1 indicating prevalence of enhanced hydrogen bonding. Cucurbituril cobalt benzamide complex showed two sharp peaks at 2θ =31.7 and 25.89. This indicates that crystalline structure is still maintained in some complexes.