Design Synthesis,Characterization And Property Research Of Novel Metal Borates

In this paper,seven kinds of borates were obtained by different methods.The structures of borate crystals were characterized by X-ray single crystal diffraction,they were further confirmed by elemental analysis,FTIR,PXRD and TG-DSC.Moreover,the structures of the samples were discussed,and the optical properties of these compounds were also explored.Furthermore,westudiedthatflameretardantpropertyof[Zn（H₂O）₆]（NO₃）₂·[Zn{B₃O₃（OH）₄}₂（H₂O）₄]·2H₂O（Zn-borate）by mixing it with Acrylonitrile Butadiene Styrene（ABS）,and the composites were further characterized by cone calorimetry tests,TG and SEM-EDX.Compound[Co（H₂O）₆]（NO₃）₂·[Co{B₃O₃（OH）₄}₂（H₂O）₄]·2H₂O（1）was obtained by a molten salt method.The crystallographic data is about monoclinic,space group P2₁/c,a=11.242（6）?,b=6.493（4）?,c=17.614（9）?,α=90.00?,β=101.021（13）?,γ=90.00?,Z=2.Its crystal structure consists of[B₃O₃（OH）₄]^-cluster and NO₃^-anions.Zn²⁺cations are covalently bonded to the polyanionic clusters and waters leading to a[Zn（H₂O）₆]octahedron and a[Zn{B₃O₃（OH）₄}₂（H₂O）₄]cluster,which are connected by hydrogen bonds（H-Bs）to form a fictitious 3D structure in which NO₃^-anion filled in the voids.The band gap is about4.01 eV.Compound[Ni（H₂O）₆]（NO₃）₂·[Ni{B₃O₃（OH）₄}₂（H₂O）₄]·2H₂O（2）have been successfully obtained under similar molten salt conditions with 1.The crystallographic data is about monoclinic,P2₁/c,a=11.222（4）?,b=6.399（2）?,c=17.571（6）?,α=90.00,β=100.890（7）?,γ=90.00,Z=2.Compounds 1 and 2 are isostructural,indicating the structure of 1 can be manipulated by replacement of Co²⁺with Ni²⁺.The band gap is about 4.19 eV.Compound[Ni（H₂O）₃]·[B₆O₇（OH）₆]（3）have been successfully obtained combined with the synthesis method of compound 1 and 2,but adding solvent to flux and adding organic amine to adjust p H during the synthesis process.The crystallographic data is about monoclinic,space group P2₁/c,a=9.890（3）?,b=12.158（4）?,c=14.925（5）?,α=90.00°,β=106.806（7）°,γ=90.00°,Z=4.Compound 3 is an isolated structure with B6 polyanion cluster.Under the action of hydrogen bond,the units can form a supramolecular skeleton through hydrogen bond.The band gap is about 4.59 eV.Compound Ni_0.8Mn_0.2{B₆O₇（OH）₃[O（CH₂）₂NH₂]₃}（4）have been successfully obtained under solvothermal conditions with a suitable precursor.The crystallographic data is about cubic,Pa-3,a=15.17730（10）?,b=15.17730（10）?,c=15.17730（10）?,α=90.00°,β=90°,γ=90.00°,Z=8.The central Ni/Mn statistic atom of compound 4 is connected to the B6 polyanion cluster by three shared O atom and to the three ethanolamine molecules by the three shared O atoms and three N atoms to form a large neutral metal borooxy cluster.The band gap is about 3.95 eV.Compound{Ni_0.7Mn_0.3[B₇O₁₀（OH）₄]₂}·（H₂en）₂（5）（en=ethylenediamine）have been successfully obtained under solvothermal conditions using the same precursor as compound4.The crystallographic data is about triclinic,P-1,a=7.4653（4）?,b=8.3522（6）?,c=11.6510（4）?,α=94.024（4）°,β=98.226（4）°,γ=101.895（5）°,Z=1.The structure of compound 5 is composed of nickel-manganese two dimensional layers and ethylenediamine molecules between the layers,which are connected by hydrogen bonds.The band gap is about 4.57 eV.Compound[Ni（1-MI）₆]·[B₅O₆（OH）₄]₂·2（C₃H₇NO）（6）（1-MI=1-methylimidazole）have been successfully obtained under solvothermal conditions using the same precursor as compound 4.The crystallographic data is about monoclinic,P2₁/c,a=11.2593（8）?,b=20.6617（13）?,c=11.5629（8）?,α=90.00°,β=102.115（2）°,γ=90.00°,Z=2.B6polyanion cluster and C₃H₇NO molecules are connected by hydrogen bonds to form a fictitious 3D structure in which[Ni（1-MI）₆]²⁺complexes filled in the voids.The band gap is about 4.24 eV.Compound[Ni（1,3-dap）]·[B₄O₇]（7）（1,3-dap=1,3-diaminopropane）was obtained by the combination of molten salt method and solvothermal conditions.The crystallographic data is about tetragonal,P4₃2₁2,a=8.5599（8）?,b=8.5599（8）?,c=12.5937（12）?,α=90.00°,β=90°,γ=90.00°,Z=4.Compound 7 is an example of using coordination polymers to construct mixed-motif inorganic-organic hybrid borates.The Ni²⁺ion exhibits a trigonal-bipyramidal coordination mode.The helical Ni-1,3-dap coordination polymer chains are entrained within a 3-D B-O network and finally form the chiral framework.The band gap is about 3.71 eV.