Synthesis,Structure And Properties Of Semi-rigid Polycarboxylic Ligands And Their Coordination Compounds

In this work,two semirigid polycarboxylic acid ligands,various transition metal ions and rigid/semirigid N-donor ligands were employed to afford eight CPs under hydrothermal and solvothermal conditions.In order to understand these CPs completely,elemental analysis,FT-IR,single crystal X-ray diffraction,thermogravimetric studies and powder X-ray diffraction（PXRD）have been carried out.In addition,the solid/liquid fluorescent spectra and electrochemical properties have also been investigated.1.Six new CPs,namely[Pb₂Cl（L₁）（H₂O）]_n（1）,[Pb₂（HL₁）（H₂O）]_n（2）,[Cd₆（L₁）₄（diib）₆（H₂O）₆]_n（3）,[Cd₂（HL₁）₂（2,2′-bipy）₂]_n（4）,[Er（L₁）（phen）（H₂O）]_n（5）,[Co₃（L₁）₂（diib）₃]_n（6）,have been synthesized hydrothermally and characterized.Complexes 1 and 2 are isomorphic with Same metals,possessing 2D pillar-layered frameworks.Complexes 3 and 6 are different network structures that are obtained at different temperatures using the same ligands,different metal salt,and solvent.Complex 4 is a 0D structure.Complex 5 is a 2D layered frameworks.Furthermore,we examined the fluorescence sensing responses of 1-4 to metal ions and small solvent molecules.It is worth noting that,complex 1,4 can act as a potential promising fluorescence sensor for sensing NB and Fe³⁺ion with high selectivity and sensitivity.Complex 2 can sensing NB and K⁺ion with high selectivity and sensitivity.Complex 3 can sensing Ag⁺ion with high selectivity and sensitivity.complex 6 has relatively excellent electrochemical properties.2.TwonewCPs,namely[Co₃（L₂）₂（bbi）₃·（H₂O）₄]_n（7）,[Co₁₂（L₂）₈（bimb）₁₂（H₂O）₂]_n（8）,have been synthesized hydrothermally and characterized.Coordination complexes 7,8 can be used as potential electrochemical materials.