Synthesis, Structure And Properties Of Metal-organic Coordination Polymers Based On Naphthalene Carboxylic Acid Ligands

In recent years,due to the rapid development of science and technology,new materials lead a new research boom.Researchers focus on the field of materials.With the continuous progress of testing methods,a variety of materials with novel structure and excellent performance have also been published.Because of the attractive structure and excellent properties of metal-organic coordination polymers,it has become a popular research object for many researchers.In order to successfully prepare metal-organic coordination polymers with novel structure and good performance,our research group adopted solvothermal method to conduct a series of exploration experiments through the self-assembly process,and successfully prepared a variety of new metal-organic coordination polymers with metal Pb（Ⅱ）,Zn（Ⅱ）,Cd（Ⅱ）as the center.Specific research contents are as follows:（1）Based on organic naphthalene carboxylic acid ligands（B26）with metal Pb（Ⅱ）ions as the center through the solvothermal self-assembly reaction（solvents:N’,N-dimethylformamide（DMF）and N’,N-dimethylacetamide（DMA））,two novel metal-organic coordination polymers have been constructed successfully:[Pb（B26）（DMF）]·DMF（1）and[Pb（B26）（DMA）]·2DMA（2）.Metal-organic coordination polymers 1 and 2 show a two-dimensional structure through metal Pb（Ⅱ）ions bridged B26 ligands.And the three-dimensional supramolecular structure formed through intermolecular hydrogen bond,π???πstacking and C-H???πforce.Meanwhile,the phase purity,crystallinity and fluorescence properties of the metal-organic coordination polymers 1 and 2 were also studied.（2）Based on organic naphthalene carboxylic acid ligands（B26）with metal Zn（Ⅱ）ions as the center through the solvothermal self-assembly reaction（solvents:N,N-dimethylacetamide（DMA）and N-methyl pyrrolidone（NMP））,two novel metal-organic coordination polymers have been constructed successfully:[Zn（B26）（NMP）₂]·NMP（3）and[Zn（B26）（DMA）（NMP）]·NMP（4）.Metal-organic coordination polymers 3 and 4show a one-dimensional chain through metal Zn（Ⅱ）ions bridged B26 ligands.And the three-dimensional supramolecular structure formed through intermolecular hydrogen bond,π???πstacking and C-H???πforce.At the same time,we also researched the phase purity,crystallinity and fluorescence properties of the metal-organic coordination polymers 3 and 4.（3）Using naphthalene carboxylate ligand B26 as the main ligand and ethylenediamine（EN）as the auxiliary ligand with metal Zn（Ⅱ）ions as the center,three kinds of metal-organic coordination polymers with different dimensions were successfully synthesized by solvothermal self-assembly reaction（solvents:N’,N-dimethylformamide（DMF）,N’,N-dimethylacetamide（DMA）and N-methyl pyrrolidone（NMP））:[Zn（B26）（EN）₂]·3DMF（5）,[Zn₂（B26）₂（EN）₄]·5DMA（6）and[Zn（B26）（EN）]·2NMP（7）.Metal-organic coordination polymers 5 and 6 exhibited zero-dimensional chain through metal Zn（Ⅱ）ions bridged B26 ligands and EN ligands.Metal-organic coordination polymers 7 exhibited one-dimensional chain through metal Zn（Ⅱ）ions bridged B26 ligands and EN ligands.And the three-dimensional supramolecular structure of the three above polymers formed through intermolecular hydrogen bond,π???πstacking and C-H???πforce.At the same time,we also researched the fluorescence properties of the three kinds of metal-organic coordination polymers.（4）Using naphthalene carboxylate ligand B26 as the main ligand and ethylenediamine（EN）as the auxiliary ligand with metal Cd（Ⅱ）ions as center,three kinds of metal-organic coordination polymers with different dimensions were successfully synthesized by solvothermal self-assembly reaction（solvents:N’,N-dimethylformamide（DMF）,N’,N-dimethylacetamide（DMA）and N-methyl pyrrolidone（NMP））:[Cd（B26）₂]·3DMF（8）,[Cd₂（B26）₂（EN）₄]·5DMA（9）and[Cd（B26）（EN）₂]·2NMP（10）.Metal-organic coordination polymer 8 formed a two-dimensional planar structure through the bridge of metal Cd（Ⅱ）ions to naphthalene carboxylic acid ligand B26,and the three-dimensional supramolecular structure under the action of intermolecular hydrogen bond force and C-H???πstacking.The metal-organic coordination polymers 9 and 10 exhibited a zero-dimensional crystal structure by connecting metal Cd（Ⅱ）ions with two types of ligands through coordination bonds,and finally forms a three-dimensional supramolecular structure through intermolecular hydrogen bonding and C-H???πpacking.At the same time,we also studied the phase purity,crystallinity,solid fluorescence and other properties of these polymers.In this thesis,the synthesis of metal-organic coordination polymers with novel structure is realized by regulating the metal center and the type of organic ligand,which provides the premise for further study of the properties of metal-organic coordination polymers.