Syntheses, Structures And Properties Of Rare-Earth Coordination Polymers Based On Imidazophenanthroline Derivative

As the fundamental research of rare earth coordination chemistry gradually in depth, it has made considerable progress and development in the research of novel rare-earth luminescence materials and relevant coordination chemistry. The application of the rare earth functional materials is continually growing, which has become an indispensable part in the development of many industries. A large number of important research results on rare earth coordination polymers would be the important scientific basis for sustainable development of society, economy, resources, and environment, also would lay a foundation to promote the development of rare earth high and new technology industry.This paper was aimed to synthesize rare earth coordination polymers with novel structures and excellent properties. Firstly, the ligand with big π-bond conjugate system was successfully synthetized, namely, (2-(2-sulfophenyl)-imidazo(4,5-f)-(1,10)-phenanthroline. Therewith, twenty new lanthanide coordination polymers were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. The text includes the following four chapters, they are the mains of the whole paper:The first chapter mainly summarized classification, synthesis methods and configuration determination of coordination polymers. The characteristics of the rare earth coordination polymers were also discussed. In addition, the present situation and research achievements in rare earth coordination polymers based on 1,10-phenanthroline derivatives were summarized compactly. Finally, the gist and signification of the paper were discussed.The second chapter mainly discussed the syntheses, structures, luminescent properties of coordination polymers 1-4 based on (2-(2-sulfophenyl)-imidazo(4,5-f)-(1,10)-phenanthroline (the HL ligand) in detail.The third chapter reported sixteen lanthanide coordination polymers 5-20 based on the HL ligand and glutaric acid (H2glu) by controlling the pH value and metal-to-ligand ratios at the same temperature. We revealed the syntheses, structures, luminescence and magnetic properties of these lanthanide coordination polymers thoroughly.The fourth chapter of this paper described white-light emission and temperature recognition properties of Eu3+/Tb3+ mixed coordination polymers. For Eu3+/Tb3+mixed compounds, multicolor luminescence was tailored from red to green regions by singly varying the mixing molar ratios of Eu3+/Tb3+ compounds. White-light emission was achieved upon excitation at 405 nm when the mixing ratio of Eu3+/Tb3+ was 4:6. The temperature-dependent PL spectra for the mixing components of Eu3+/Tb3+=4:6 indicated a temperature recognition property in the range of 50-225 Kupon excitation at 370 nm.