Ionization efficiencies of C3H6, C4H8, C6H12, C2H6O,and C3H8O isomers

Ionization efficiencies of 14 organic compounds have been measured in the wavelength region from 105 to 134nm using an ionization chamber. The compounds examined are cyclopropane, propylene, l-butene, isobutene, cis-and trans-2-butenes, cyclohexane, 1-hexane, tetramethylethylene, ethyl alcohol, dimethyl ether, n-, and iso-propyl alcohol, and ethyl methyl ether. The ionization efficiencies of cyclopropane and cyclohexane monotonically increase with increasing photon energy, but those for the others show a peak or a shoulder in the wavelength region of the present work.     

Thermodynamic Properties of Dimethylaminoarglabin Methyl Iodide C1 8H2 8O3NI and Its Analogs

The heat of solution of dimethylaminoarglabin methyl iodide C_{1 8}H_{2 8}O₃NI at dilutions (mole of salt/mole of water) of 1 : 75000, 1 : 100000, and 1 : 150000 was determined by isothermal calorimetry. The data obtained were used to calculate the standard heat of solution of the compound in an infinitely dilute (standard) aqueous solution. The heats of combustion, melting, and formation of C_{1 8}H_{2 8}O₃NI and 33 its analogs were estimated by approximate methods of chemical thermodynamics.     

脂肪酸铕配合物/PMMA的合成及发光性能

以一定比例正辛酸和月桂酸为第一配体,通过皂化法合成了脂肪酸铕配合物,并溶于甲基丙烯酸甲酯(MMA)单体通过本体聚合得到了含脂肪酸铕的PMMA光致发光聚合物材料AxByEu/PMMA(A为正辛酸根,B为月桂酸根,x、y分别表示正辛酸和月桂酸的摩尔比). 考察了不同的第二配体(咔唑、二甲基-联吡啶、邻菲罗啉、噻吩甲酰三氟丙酮HTTA)对脂肪酸铕聚合物发光性能的影响,选择出合适的第二配体HTTA,合成了A3Eu/HTTA/PMMA聚合物. 通过红外光谱、紫外光谱及荧光光谱测试技术对配合物及聚合物的结构和荧光性能进行表征. 结果表明,合成的含脂肪酸铕配合物及其聚合物均具有很好的光致发光性能,紫外激发能发射Eu3+离子的特征红光. 当HTTA的质量分数减小至MMA的0.02%时,仍能很好地促进体系的发光,且不影响聚合物本身的透明性.     

Group 2 metal salts of pyromellitic acid: [Mg(H2O)6](C10H4O8) and [Ba(C10H4O8)(H2O)5]

Structural determinations of the magnesium(II) and barium(II) salts of pyromellitic acid (benzene‐1,2,4,5‐tetra­carboxyl­ic acid) are presented. Hexa­aqua­magnesium(II) benzene‐1,2,4,5‐tetra­carboxyl­ate(2−), [Mg(H₂O)₆](C₁₀H₄O₈), (I), and penta­aqua­[benzene‐1,2,4,5‐tetra­carboxyl­ato(2−)]­barium(II), [Ba(C₁₀H₄O₈)(H₂O)₅], (II), are both centrosymmetric and both possess a 1:1 metal–ligand ratio, but the two structures are found to differ in that the magnesium salt contains a hexaaqua cation and possesses only hydrogen‐bonding interactions between cations and anions, while the barium salt exhibits coordination of the carboxyl­ate ligand to the nine‐coordinate metal centre. In (I), both ions sit on a 2/m site symmetry, and in (II), the cation and anion are located on m and i site symmetries, respectively.