Synthesis,Characterization And Properties Of Metal Coordination Complexes Derived From Nitrogen Heterocyclic And Carboxylic Acid Ligands

In recent decades,scientific researchers have invested a great deal of effort in synthesizing metal coordination complexes,not only their diverse topologies,but also their their immesurable application in fluorescence properties,magnetic properties,catalytic properties,and other properties.Through the scientific researcher work under the constant attack,metal coordination polymers have a different topology and special performance has been a large number of papers reported.Using of nitrogen-containing heterocyclic compounds or organic carboxylic acids as organic ligands with the transition metal prepared of metal coordination compounds in the hydrothermal or solventhermal condition,the number of papers occupy a certain position.The main research contents of this paper have selected nitrogen-containing heterocyclic compounds and carboxylic acid organic compounds as organic ligands,which are employed to react their different transition metal ions under hydrothermal or solvothermal conditions.Ttwelve functional coordination polymers can be contained.These structures were characterized single X-ray crystal diffraction was used to determine the crystal structure.Elementary analysis?EA?,infrared spectroscopy?IR?,X-ray powder diffraction?PXRD?and thermogravimetric analyzer?TGA?were used to characterize the properties were conducted for further investigation.The fluorescence properties and magnetic properties of the complexes were also studied.The main contents of this paper are as follows:First,under the hydrothermal or solvothermal reaction,three new metal coordination polymers have been synthesized based on adipic acid?ADP?and2-?pyridine-3-yl?-?1H?-benzoimidazole?3PBI?ligands:[M?ADP??3PBI?₂?H₂O?₂].2H₂O?M=Ni?II?and Co?II?for 1 and 2,respectively?and[Cd?ADP??3PBI??H₂O?]?3?Complexes 1 and 2 are isostructure.Both of them form a one-dimensional?1D?linear chain structure connected by adipic acid and further assembled into a 3D supramolecular framework by?????stacking and hydrogen bonding interactions.Complex 3 displays two-dimensional layer which can further extend to a 3D supramolecular architecture via hydrogen bonding and?????packing interactions.Complexe 3 has good fluorescence property.Second,four metal coordination polymers constructed from 3-?1-carboxyethyl?benzoic acid?L?and 2-?pyridine-4-yl?-?1H?-benzoimidazole ligand?4PBI?:[M?L??4PBI??H₂O?]_n?M=Ni?II?,Co?II?and Cu?II?for 1,2 and 3,respectively?and[Cd?L??4PBI?]_n?4?have been synthesized by the hydrothermal reaction,Complexes 1,2and 3 are isostructure.They form an one-dimensional?1D?chain connected by3-?1-carboxyethyl?benzoic acid and further assemble into a three-dimensional?3D?supramolecular structure by?????stacking and hydrogen bonding interactions.Complex4 displays two-dimensional?2D?layer which can further extend to a 3D supramolecular structure via hydrogen bonding and?????packing interactions.Complexe 4 has good fluorescence property.Three,under the hydrothermal or solvothermal reaction,five new high-dimensional metal coordination polymers were constructed mainly based on4-?carboxymethyl?-2-ethoxybenzoicacid?RGAA?:[Ni?RGAA??BPY?]?2H₂O?1?,[Mn?RGAA?]?H₂O?0.167(C₄H₁₀O)?2?,Co?RGAA?]?1.5H₂O?3?,[Zn?RGAA??BPY?_1/2]?4?,and[Cd₅??₃-OH?₂?RGAA?₄]?5??BPY=4,4'-bipyridine?.Complex 1 possesses two-dimensional?2D?layer which can further be extended to a 3D supramolecular architecture via hydrogen bonding interactions.All of complexes 2-5 display three-dimensional?3D?framework.Complexes 2 and 3 shows a bi-nodal framework of?5,5?-connected?4^4.6^3.8^3??4^7.6^3?.Complex 4 displays a 3D network with a?2,3,4?-connected?6^{^}3.8^{^}2.10?₂?6^{^}3?₂?8?topology.While complex 5 exhibits a 3D network with a?3,10?-connected?3.4.5?₂?3^4.4^6.5^18.6^14.7^2.8?topology.For1-3,variable-temperature magnetic susceptibility reveales the existence of antiferromagnetic property,In addition,the luminescent properties of compounds 4-5have been investigated.These results suggest that both the coordination preferences of the metal ions and the organic ligand play a critical role in the final structures and properties.