Examination of Polymeric Azomethine Compounds and Their Transition Metal Complexes by Using XRF and XRD Technique

In this study,the electronic transition properties and structural analysis of the metal complexes(Ni(Ⅱ),Co(Ⅱ),Cu(Ⅱ)and Mn(Ⅱ))of three different polymer ligands were performed by using XRF and X-ray diffraction(XRD)techniques,respectively.The structural analysis of the polymers and their complexes were performed by XRD technique and some of the polymers were found to be in the face-centred cubic(fcc)structure.In addition,the values of the present K X-ray intensity ratios are significantly greater than the values reported in literature.

Syntheses,Crystal Structures and Thermal Stabilities of Two New Mixed Ligated Coordination Polymers with Rigid Dicarboxylate and Flexile N-donor Ligands

Two new coordination polymers,[Co（BIPA）（bpp）]（1） and [Zn（BIPA）（bpp）（H2O）]（2）（H2BIPA = 5-bromoisophthalic acid,bpp = 1,3-di（4-pyridyl）propane） have been synthesized via hydrothermal reactions.The two compounds were characterized by elemental analysis,IR spectra,TG analysis and single-crystal X-ray determination.Compound 1 crystallizes in triclinic,space group P1 with a = 9.0316（13）,b = 10.1179（14）,c = 11.8884（17） ,α = 68.022（2）,β = 84.749（2）,γ = 77.791（2）°,V = 984.5（2） 3,Z = 2,C21H17BrN2O4Co,Mr = 500.21,Dc = 1.687 g.cm-3,μ = 2.932 mm-1,S = 0.981,F（000） = 502,R = 0.0440 and wR = 0.1357 for 3773 observed reflections with I 2σ（I）.Compound 2 crystallizes in the monoclinic system,space group P21/c with a = 7.8466（10）,b = 27.483（4）,c = 9.6583（13） ,β = 96.663（3）°,V = 2068.8（5） 3,Z = 4,C21H19BrN2O5Zn,Mr = 524.66,Dc = 1.685 g.cm-3,μ = 3.155 mm-1,S = 0.969,F（000） = 1056,R = 0.0441 and wR = 0.0517 for 4058 observed reflections with I 2σ（I）.The two compounds are constructed from the BIPA2-and bpp ligands but they exhibit different kinds of one-dimensional chain structures.In 1,the chains are composed of the Co（Ⅱ） ions and BIPA2-ligands,and the chains are further extended into a 2D framework structure by π...π interactions of the benzene rings from the BIPA2-ligands between the adjacent chains.In 2,the chains are made up of Zn（Ⅱ） ions and BIPA2-ligands through another fashion,and the chains are further linked via hydrogen bonding interactions to yield a two-dimensional supramolecular layer structure.Furthermore,the bpp ligand features two kinds of different coordination modes in the two compounds.