Synthesis and fluorescence properties of Cd(Ⅱ)complexes constructed with mixed ligands
A novel coordination polymer{[Cd2.5(L)2(bpy)2Cl(NO3)(H2O)3]·(NO3)·2H2O}was constructed by self-assembly at room temperature using a mixture of N containing rigid ligand 4,4'-bipyridine(bpy),zwitterionic ligand 4-carboxyl-1-(3-carboxybenzyl)pyridin-1-onium chloride(H2LCl)and Cd2+using liquid phase diffusion method.The structures and properties of the coordination polymer were analyzed by single crystal X-ray diffraction,Hirshfeld surface and two-dimensional fingerprint,powder X-ray diffraction,thermogravimetry,and solid fluorescence.The results showed that the coor-dination polymer is a one-dimensional ladder shaped chain composed of[Cd(bpy)2]symmetric rod-shaped unit and two parallel ring chain structures.By abundant intermolecular interactions(π···π stacking interactions,O—H···O,and C—H···O hydrogen bonding),the ladder shaped chains pene-trate parallel and stack with each other,ultimately forming a stable three-dimensional supramolecular structure.In addition,due to the presence of d10 metal ions,the coordination polymer exhibits a similar but enhanced light green fluorescence to the ligand H2LCl in the wavelength range of 425-466 nm,with CIE coordinates is(0.287 0,0.334 6).
coordination polymercrystal structureliquid phase diffusion methodintermolecular interactionssolid state fluorescence