Conjugated Rotaxanes With Bis-terpyridyl Ruthenium Complex As End Group: Synthesis, Characterization And Properties

Supramolecule devices have attracted growing attention, and become one of the most active fields. Rotaxanes can be used as the model compounds of supramolecule devices, such as molecule switch and molecule motor. Rotaxanes, which contain metallic ion or metal complex, not only have special structures, but also possess multiple properties, such as electron transfer, energy transfer, irradiancy, electricity, magnetism and mechanical movement. The synthesis, characterization and properties of water-soluble binuclear bis-terpyridyl ruthenium complexes and conjugated rotaxanes with an Ru-containing axle were systematically carried out. The work is described as following.1. Water-soluble binuclear bis-terpyridyl ruthenium complexes have been synthesized, the structures are characterized by ~1H NMR and ESI-MS spectroscopy. The studies of the UV/visible absorption and luminescence spectra have shown that the substituents of bridging spacers have little effect to the photophysical properties. While the electrochemical studies showed that the complexes are almost insulating, and there is no interaction between the two ruthenium atom.2. Ru-containing conjugated rotaxanes, which utilize carboxy-functionalized bis-terpyridyl ruthenium complex as end group, have been synthesized. The structures are characterized by NMR spectroscopy and ESI-MS spectroscopy. The photophysical properties have shown that insulation by the cyclodextrin reduces the luminescence intensity compared to that of free dumbbell. The photosensitive properties have showed that the insulation by the cyclodextrin enhances the efficiency compared to that of free dumbbell, and the dinuclear complexes could greatly improved the efficience compared to that of the mononuclear complex. While electrochemical studies showed that the complexes are almost insulating, and there is no interaction between the two ruthenium atom.