1 H NMR STUDY OF THE HOST-GUEST CHEMISTRY IN A SUPRAMOLECULAR HELICATE FEII 2L3SOLUTION

A novel [(FE2L3)-L-II](4+) metallo-organic helicate results from subcomponent self-assembly of a C-3-symmetric triamine (4,4',4 "-(1,3,5-triazine-2,4,6-triyl) trianiline), octahedral iron(II) and 2-formyl pyridine in CH3CN solution. The constitution of this supramolecular helicate was confirmed by ESI-MS and H-1 NMR spectra. Different planar aromatic guests were selected to investigate host-guest interactions by shifts of H-1 NMR signals. The results show that electron-rich aromatic molecules with matched size and symmetry, such as pyrene, are subject to be bound with the outstretched arms of the helicate ligand via aromatic pi-pi interactions.