| In this thesis,different zole-carboxylate ligands with multiple functionalgroups were used to react with metal ions and 22 new complexes were obtained.Structures of all the complexes were determined by single-crystal X-ray analysis.The spectroscopic properties of the complexes were characterized by FTIR,Raman,electronic and solid state fluorescence spectra.Thermal properties of the complexes were characterized by TGA and DSC analysis.Including:1.The bi-functional ligands 3-?1H-1,2,4-triazol-1-yl?benzoic acid?3-Htba?and 4-?1H-1,2,4-triazol-1-yl?benzoic acid?4-Htba?were used to react with metal ions under hydrothermal conditions and eight new complexes were obtained.The X-ray crystal structure analyses reveal that,complexes {[Cu?3-tba?2?H2O?]·2H2O}n?1?and [Pb?3-tba?2]n?7?have 1D double chain structures,while complex [Cd2?3-tba?2?HCOO?2]n?2?has a 3D pillared double-layer network.Complexes [Cd?3-tba?2?H2O?4]?3?,[Zn?3-tba?2?H2O?4]?4?,[Ni?3-tba?2?H2O?4]?5?,and [Co?3-tba?2?H2O?4]?6?are isostructural mononuclear compounds,while [Co?4-tba?2?H2O?4]?8?and 6 are isomeric compounds with different crystal structures.Zero dimensional complexes 3,4,5,6 and 8 are further assembled into 3D supramolecular frameworks via diverse hydrogen bonds and ?–? stacking interactions.Hirshfeld surface analysis was used to further study the intermolecular weak interactions of the five 0D complexes,which reveals the contributions of various intermolecular hydrogen bonds and ?-? interactions to the Hirshfeld surface.Solid state fluorescence determination reveal that complexes 2,3,4 and 7 have intense luminescence emissions when excitated by UV irradiation at room temperature.2.The three tri-functional ligands 5-?1,2,4-triazol-1-yl?pyridine-3-carboxylic acid?Htpa?,2-?1,2,4?triazol-1-yl-terephthalic acid?H2tta?and 5-?1H-1,2,4-triazol-1-yl?benzene-1,3-dioic acid?H2tbda?were used to react with transition metal ions under hydrothermal conditions,giving eight new complexes.Among them,3D complexes {[Cd?tpa?Cl]·H2O}n?9?,[Cu2?tpa?2?OH?]n?10?and 0D complex [Co?tpa?2?H2O?4]?11?were synthesized based on Htpa ligand,while 1D double chain polymers {[Mn?Htta?2?H2O?2]·2H2O}n?12?and {[Cd?Htta?2?H2O?2]·2H2O}n?13?were synthesized based on H2 tta ligand.Moreover,three 2D planar polymers [Co?tbda?2?H2O?2]n?14?,[Ni?tbda?2?H2O?2]n?15?and [Mn?tbda?2?H2O?2]n?16?were synthesized based on H2 tbda ligand.The physical properties of these complexes were characterized and the intermolecular hydrogen bonds and ?–? interactions were studied.Our research also showed that the two 3D coordination polymers {[Cd?tpa?Cl]·H2O}n?9?and [Cu2?tpa?2?OH?]n?10?can efficiently photocatalytic degradation of organic dyes in aqueous solution under UV irradiation.The photocatalytic mechanisms of the two 3D complexes were also studied in detail.3.The ligand 2-?1H-benzoimidazol-2-yl?benzoic acid was firstly synthesized,then it was used to react with transition metal ions under hydrothermal conditions giving six new complexes [Cu?2-biba?2]·H2O?17?,[Co2?2-biba?4?H2O?4]·?CH3OH??18?,[Mn?2-biba?2?H2O?2]·?CH3OH??19?,[Ni?2-biba?2?H2O??CH3OH?]·2H2O?20?,[Ni?2-biba?2]·H2O?21?and [Cd2?2-biba?4]?22?.X-ray crystal structure analyses reveal that,strong intermolecular hydrogen bonds were found in complexes 17–22,and they are further assembled into 2D or 3D supramolecular frameworks via hydrogen bonds.In addition,the intramolecular ?–? stacking interactions were found in complexes 18,19,20 and 22 which make their structures more stable.Solid state fluorescence test shows that complex 22 exhibits strong fluorescence emission when excitated by UV radiation. |
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