Construction Of Supramoleculars And Coordination Polymers Based On 4-((2,7-dibromo-9-((pyridin-4-yl)methyl)-9h-flu Oren-9-yl)methyl) Pyridin And Synthesis, Characterization Of Nano-ceria

A serials of supramolecular compounds based on 4-((2, 7-dibromo-9-((pyridin -4-yl)-methyl)-9H-fluoren-9-yl) methyl) pyridine (dpfp) have been synthesized and characterized by using elemental analysis, IR and UV methods. Four crystal structures of (dpfp)·NO₃, (dpfp)·ClO₄, (dpfp)·SiF₆ and (dpfp)·Br have been obtained. Structural analyses suggest that different anions have different influences on compound structures and intermolecular hydrogen-bond interactions.More than forty kinds of metal complexes have been synthesized based on the reactions of 4-((2, 7-dibromo-9-((pyridin-4-yl)-methyl)-9H-fluoren-9-yl) methyl) pyri- dine (dpfp) with transition metallic ions. By using elemental analysis, IR and UV methods, these complexes have been characterized. Seven crystal structures of [Mn(dpfp)₂Cl₂]_n, [Cd₃(dpfp)₆Cl₆]_n, [Cd₄(dpfp)₆(SCN)₈]_n, [Zn(dpfp)Cl₂·2DMF]_n, [Zn₄(dpfp)₂(CH₃COO)₈]_n, [Cu₂(dpfp)₂(CH₃COO)₅·2DMF]_n and [Cd(dpfp)(acac)2]_n have been determined by X-ray single crystal diffraction. Structural analyses reveal that these seven complexes are all novel coordination polymers with different geometric constructions. For instance, (3a), (3b) and (3c) exist as 3D holes; (3d) and (3e) form 1D helical chains; (3f) exhibits as double chains and (3g) aggregates as 2D diamond structures. In addition, for part of the complexes, their fluorescence emission spectra, magnetic properties and electrochemical properties have also been studied. Ceria nanoparticles with controllable morphologies and sizes are successfully synthesized via hydrothermal method in the presence of polyvinylpyrrolidone (K30). We have investigated the influence of different solvent ratio and reaction time to the formation of ceria nanoparticles. The as-synthesized samples are characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM) and UV-vis absorption spectrum.