Preparation And Properties Of Coordination Compounds Based On 9-Fluorenone-4-Carboxylic Acid

In this paper,the design,syntheses,crystal structures and properties of new coordination compounds based on a fluorene derivative ligand were studied.As a kind of materials with rigid planar biphenyl structure,organic fluorene compounds have been paid much attention in semiconductor field due to its wide band gap,stable conjugate chain length,good charge transfer ability,higher photothermal stability and high solid-state fluorescence quantum efficiency.However,there are relatively few reports on coordination compounds containing fluorene carboxylic acid organic ligands,and we hope to broaden the research in this field.Based on these considerations,we have successfully synthesized eight new coordination compounds constructed from 9-fluorenone-4-carboxylic acid based on hydrothermal and solution diffusion methods.Furthermore,the single-crystal structure analysis,elemental analysis,infrared,ultraviolet spectrum,thermogravimetric,fluorescence,magnetic and photocatalysis properties of the synthesized coordination compounds were characterized.The paper is divided into five chapters.In the first chapter,the concept,the research progress,the influence factors,the research status and the development prospect of coordination compounds were systematically introduced.In addition,coordination compounds based on fluorene derivative ligand were also elaborated in detail.In the end,we pointed out the importance of the project and summarized the main results we got.The second chapter gives a detailed introduction to the experimental method,the test instrument and the chemicals.In the third chapter,we synthesized five novel coordination compounds[Cd(FDC)2(4,4'-bpy)(H2O)]n(1),[M(FDC)2(H2O)2]n(M=Cd(2),Zn(3)),Cd2(FDC)4(2,2'-bpy)2·2EtOH·2H2O(4)and[Zn2(FDC)2(OAc)2(4,4'-bpy)]n(5)based on the reactions of the corresponding metal ions(Zn(?),Cd(?))with the fluorene derivative ligands of HFDC by hydrothermal and solution diffusion methods.Compounds 1,2,3 and 5 are one-dimensional chain structure,4 is a dinuclear structure.2 and 3 are isomorphic.In 1 and 5,adjacent metal centers are linked to one-dimensional chain structure through 4,4'-bpy.2 and 3 are linked into one-dimensional chain structure by oxygen atoms from the HFDC ligand and coordination water molecules.Through hydrogen bonding and ?…? stacking,all the five compounds form a three-dimensional supramolecular structure.The optical properties of compounds 1-5 were studied.Compounds 1-5 show green light emitting.The high selectivity and the quantitative detection of the Fe3+ and Cr2O72-revealed that compounds 1-4 can be used as the fluorescent probe to detect the Fe3+ ions.By comparing quenching constant and minimum detection limit,compound 1 has stronger detection ability for Fe3+,while 3 for Ct2O72-.The quenching mechanism of 1 and 3 was studied.The results show that 1 and 3 compete with Fe3+ and Cr2O72-,which leads to quenching.The photocatalytic properties of 1 and 2 for the degradation of RhB and MB dyes were studied.The degradation efficiency of 1 and 2 for dyes was greatly improved by adding photosensitizer hydrogen peroxide.In the fourth chapter,we synthesized three new coordination compounds[Co2(FDC)2(H2O)2]n(6),Cu2(FDC)4(H2O)2(7)and[Cu2(FDC)4(2,2'-bpy)2]-2DMF-2H2O(8)based on the reactions of the corresponding metal ions(Co(?),Cu(?))with HFDC ligands of by solution diffusion methods.Compounds 6 and 2 are isomorphic.7 and 8 are both dinuclear structures,and the coordination units of the two compounds are linked into three-dimensional supramolecular structures by intermolecular hydrogen bonding and ?…? stacking,respectively.The magnetic properties of compounds 6-8 were studied,the results of variable temperature magnetic susceptibility data show that there is a weak antiferromagnetic interaction in 6-8.The magnetic susceptibility of compound 6 at variable temperature was also measured.In the fifth chapter,a brief conclusion and outlook are given.