Li0.5-0.5xZnxFe2.5-0.5xO4纳米纤维的电纺制备及其结构和磁性能

以聚乙烯吡咯烷酮、硝酸锂、硝酸锌和硝酸铁为主要原料,通过静电纺丝技术结合后期的热处理制备了直径在50～100 nm的单相Li0.5-0.5xZnxFe2.5-0.5xO4（x=0.0,0.2,0.3,0.4,0.5,0.8）纳米纤维.利用热重-差热分析、X射线衍射、场发射扫描电子显微镜、透射电子显微镜和振动样品磁强计研...     

Co3O4/CoO/Co/石墨复合材料的制备及其电容性能研究

以葡萄糖为前驱物,采用水热法合成了胶态碳球,然后利用胶态碳球制备了Co3O4/CoO/Co/石墨复合材料.此复合材料与其它研究者采用类似方法制备的物质相比具有完全不同的结构,它们是由多层不同物质组成的球形结构,其最外层是Co3O4,第二层是CoO,第三层是Co,最里面一层是石墨.采用循环伏安和恒电流充放电等方法对Co3...     

稳恒磁场下水热法制备钡铁氧体

利用XRD,SEM,TEM和振动样品磁强计(VSM)等检测手段对不同磁场强度下水热法制备的钡铁氧体粉末进行了分析.实验结果表明,无磁场下,150℃时得到的产物为BaFe2O4颗粒,而180℃时产物为片状BaFe12O19施加磁场后,150和180℃下水热反应产物都为棒状BaFe12O19随着磁感应强度的增加,水热反应产...     

2,3-二羟甲基-2,3-二硝基-1,4-丁二醇四硝酸酯的合成、晶体结构及性能研究

以硝基甲烷为起始原料,经缩合、环化、氧化耦合、脱缩酮及硝化等5步反应合成了2,3-二羟甲基-2,3-二硝基-1,4-丁二醇四硝酸酯(BHDBT),总收率为36.1％,并采用核磁共振谱、红外光谱以及元素分析等进行了结构表征.用浓盐酸代替氯化氢气体,改进了关键中间体2,3-二羟甲基-2,3-二硝基-1,4-丁二醇(BHDB)的合成方法,并确定最佳反应条件为:刀(浓盐酸):n(BDND)=1.1∶1,反应温度55℃,时间4h,收率为94.8％.首次发现了BHDB和BHDBT的亚甲基质子具有磁不等价性,并从理论上分析其产生的原因.培养了BHDBT单晶,四元衍射晶体结构解析表明:BHDBT属于单斜晶系,空间群P2(1)/n,晶胞参数:a=0.81944(11) nm,b=2.3365(3) nm,c=0.85838(11) nm,a=90°,β=113.501(2)°,y=90°,V=1.5072(3) nm3,Z=4,Dc=1.852 g·cm-3,μ=0.189 mm-1,F(000)=856.BHDBT熔点为86.37℃,分解峰温度为185.79℃(DSC),摩擦感度为100％ (3.92 MPa,90°),特性落高H50为10.0 cm(5 kg).     

含氟香豆素基哌嗪荧光探针的合成及其性能研究

以7-羟基-4-三氟甲基香豆素和哌嗪为原料,首次合成了具有双荧光侧臂的新型香豆素类荧光探针化合物,研究发现其中间隔基较少的化合物对Cu2+具有较高的选择性,并且对Cu2+的识别不受其它金属离子的干扰.Cu2+在2.0×10-6～1.0×10-4mol/L范围内,探针的荧光强度与其浓度有较好的线性关系.     

Syntheses,Crystal Structures and Property Studies on Cu（Ⅱ） and Co（Ⅱ） Complexes with 1,8-Naphthalimid Schiff Base

The ligand of N-(2-hydroxybenzylideneamino)-1,8-naphthalimide (HL) and its metal complexes of CuL2 (1) and CoL2 (2) have been synthesized. Elemental analysis, IR and X-ray single-crystal diffraction characterizations for 1 and 2 have been carried out. In the complexes of 1 and 2, the central metallic ions of Cu2+ and Co2+ coordinate with two deprotonated ligands of L-, respectively and adopt distorted square planar geometries. The thermal analysis result shows that the two complexes undergo two similar decomposition processes because of their similar geometric configurations. For the two complexes, fluorescence spectra measurements indicate that complex CoL2 emits stronger blue fluorescence than HL and the complex CuL2 does not emit fluorescence at all.     

1D Lanthanide Coordination Polymers Based on 3-（Pyridin-4,yl）benzoic Acid： Syntheses, Structures and Luminescent Properties

Four novel 1D lanthanide coordination polymers with formula [Ln(3,4-pybz)3(H2O)2· H2O]n (Ln = 1 Sm; 2 Eu; 3 Tb; 4 Dy, 3,4-Hpybz = 3-(pyridin-4-yl)benzoic acid) have been synthesized by hydrothermal reactions of lanthanide oxide and 3-(pyridine-4-yl) benzoic acid. Single-crystal X-ray diffraction shows that the four compounds are isostructural. They all crystallize in a monoclinic system, space group P1. They have a doubly carboxylate-bridged infinite-chain structure with alternating Ln-(carboxylate)2-Ln linkages and one chelating carboxylate group on each metal center. The Ln ion also combines to two water molecules to form an eight-coordinate square antiprismatic geometry. The pyridine nitrogen atoms of the ligand do not coordinate to the metal centers but direct the formation of a 3D network through hydrogen bonding with coordinated water molecules. The photoluminescent properties of 2 and 3 have been also studied.     

双模板法制备具有介孔孔壁的三维有序大孔二氧化铈及其改善的低温还原性能

以聚甲基丙烯酸甲酯(PMMA)为硬模板,三嵌段共聚物F127、十六烷基三甲基溴化铵(CTAB)或聚乙二醇(PEG)为软模板剂(表面活性剂),柠檬酸为络合剂,硝酸铈为金属前驱体,采用双模板法成功地合成出具有介孔孔壁的三维有序大孔(3DOM)结构的立方相CeO2样品CeO2-F127,CeO2-CTAB和CeO2-PEG,...     

Synthesis, Crystal Structure and Luminescent Property of the One-dimensional Chain Chlorodibenzyltin 2-Quininate

A one-dimensional chain chlorodibenzyltin 2-quininate has been synthesized and characterized by IR, NMR spectra and elemental analysis. The crystal structure has been determined by X-ray diffraction. The crystal belongs to the monoclinic system, space group I4(—) with a = 19.1171(10), b = 19.1171(10), c = 12.5158(6) , Z = 8, V = 4574.1(4) 3, Dc = 1.477 g·cm-3, μ(MoKα) = 1.252 mm-1, F(000) = 2032, R = 0.0259 and wR = 0.0723. In the complex, the tin atom is six-coordinated to adopt a distorted octahedral configuration with bridging carboxyl of quinoline-2-carboxylic acid. The result of fluorescence spectrum analysis shows that the title complex at room temperature exhibits an intense photoluminescence with maximum emission at 364.2 nm (λex = 303.0 nm).     

A 2D Lanthanide-organic Framework Based on Inorganic Lanthanum（Ⅲ） Sulfate Skeletons：Synthesis,Structure,and Luminescence and Thermal Properties

A new lanthanum coordination polymer formulated as {[La2(pyda) 2(μ4-SO4) ·5H2O]· 2H2O}n(1,H2pyda = 2,6-pyridine-dicarboxylic acid) has been synthesized from the reaction of H2pyda with lanthanide nitrate in the presence of sulfate as a counter anion. The compound was characterized by elemental analysis,IR spectroscopy and X-ray single-crystal diffraction. It crystallizes in the orthorhombic system,space group Pna21,with a = 18.8558(19) ,b = 6.5831(7) and c = 18.7543(19) . The compound is a 2D hybrid,in which the La(Ⅲ) ions were doubly connected by the carboxylic group of pyda2-ligand to form the La(Ⅲ) dimer followed by being grafted into 1D zig-zag chains which are further connected into a 2D network containing {[La(SO4) ]+}n helical chains. The interchain hydrogen bonding and π-π stacking interactions extended the 2D networks into a 3D supramolecular edifice.