Syntheses,Crystal Structures And Properties Of A Series Novel Coordination Compounds With Pyridine-carboxylate Derivative Ligands

Since the beginning of the new century,supramolecular chemistry,coordination chemistry and crystal engineering have shown a rapid development trend.The design and syntheses of complexes with novel structure,excellent properties and potential application have gradually become the hotspots of the modern coordination chemistry.For series,twenty three transition metal coordination compounds and lanthanide coordination compounds with high heat stability,excellent optical,and magnetic properties have been produced by employing pyridine-carboxylate derivative ligands,such as 5-fluoronicotinic acid(5-FnicH)and 5-(6-carboxypyridin-3-yl)isophthalic acid(H3L),as principal building blocks,reacting with transition metals(Mn~?,Co~?,Cd~?,Zn~?,and Ni~?)and rare earth metals(LaIII,PrIII,NdIII,EuIII,GdIII,TbIII,and TmIII)under hydrothermal conditions.All of the promising coordination compounds are characterized by single-crystal X-ray diffraction,infrared spectroscopy,elemental,and thermal analyses.In addition,the optical and magnetic properties of the complexes have also been discussed.This article contains three chapters and the main profile is as follows:Chapter 1: The concept and development of coordination chemistry,coordination polymer,crystal engineering,and supramolecular chemistry were briefly introduced.The synthesis,diverse crystal structure,main influencing factors,and the application or potential application value in the reality of the coordination polymer were summarized.Chapter 2: Five transition metal coordination compounds(1�5)were generated by hydrothermal methods from the metal(II)nitrates(Co~?,Cd~?,and Ni~?),5-fluoronicotinic acid,and an optional ancillary ligand 1,10-phenanthroline(phen)or2,2'-biimidazole(H2biim).In addition,under hydrothermal conditions,eight lanthanide coordination compounds(6�13)were generated from the rare earth metals(LaIII,PrIII,NdIII,EuIII,GdIII,TbIII,and TmIII),5-fluoronicotinic acid,and an ancillary1,10-phenanthroline ligand.The coordination moods and structure characteristics of5-FnicH were discussed.The single crystal structures were characterized by single-crystal X-ray diffraction,elemental,IR spectroscopy,and PXRD analyses.In addition,the thermal stability,magnetic,and luminescent properties of the complexes were also investigated and discussed.Chapter 3: Ten novel coordination compounds(14�23)were generated by hydrothermal methods from the 5-(6-carboxypyridin-3-yl)isophthalic acid(H3L),metal(II)nitrates(Mn~?,Co~?,Cd~?,Zn~?,and Ni~?),and an optional ancillary ligand2,2'-biimidazole,1,10-phenanthroline,or 4,4?-bipyridine(4,4?-bipy).The coordination moods and structure characteristics of H3 L were discussed.The single crystal structures were characterized by single-crystal X-ray diffraction,elemental,IR spectroscopy,and PXRD analyses.In addition,the thermal stability,magnetic,and luminescent properties of the complexes were also investigated and discussed.