Synthesis,Characterization And Luminescence Properties Of Complexes With Salicylamide And Quinoline Ligands

Salicylamide and Quinoline ligands are two classes of important compounds and they can be widely used in analytical chemistry, biochemistry, and functional material due to their high selectivity and coordination capability to the metal ions. In this dissertation, a series of flexible salicylamide ligands and their rare earth complexes have been synthesized and characterized, and their fluorescent properties have also been investigated in detail. In addition, a few chemical fluorescence sensors based on quinoline platforms have been designed and synthesized, and their selectivity of metal ions have been studied. This dissertation is divided into six parts:1. A brief review of lanthanide complexes based luminescent switches and sensors where the emission and their self-assemblieis changed by the presence of cations and anions, was concisely given. The design principle and mechanism of chemical sensors and a few examples for cation selectivity were introduced.2. Two new flexible exo-bidentate ligands incorporating different chain length of the backbone bearing two arms of salicylamide moieties, were designed and synthesized. These two structurally related ligands as building blocks were used for constructing diverse lanthanide polymers with luminescence properties.3. A series of flexible salicylamide ligands and their lanthanide complexes were prepared and charactered. Their supramolecular structures and solid luminescence properties, which were influenced by the backbone and terminal amide group, were discussed in detail.4. A fluorescent Zn2+sensor based on the8-aminoquinoline platform has been synthesized. This sensor displays high selectivity, sensitive fluorescence enhancement, strong binding ability and ratiometric response to Zn2+.5. A fluorescent sensor based on8-aminoquinoline and8-hydroxyquinoline platforms has been synthesized, which displays high selectivity and sensitive fluorescence enhancement to Cd2+in ethanol. Moreover, this sensor can distinguish Cd2+from Zn2+via two different sensing mechanisms.6. The design and synthesis of a series of fluorescent sensors for Al3+based on Schiff base have been presented. The relationship between the structures of these ligands and their complexes and the selectivity was studied.