A novel complex of a new 1,4-dicyclohexyl cucurbituril(DCYQ6) with sodium(I) ion was synthesized, and the crystal structure was determined by X-ray diffraction technique. In this self-assembled entity both the cavity ...A novel complex of a new 1,4-dicyclohexyl cucurbituril(DCYQ6) with sodium(I) ion was synthesized, and the crystal structure was determined by X-ray diffraction technique. In this self-assembled entity both the cavity interaction of DCYQ6 included a nitrate anion and the portal interaction of the dipole carbonyls of DCYQ6 with sodium cations lead to form self assembled molecular capsules. The crystal structure of the entity shows a packing of the self assembled molecular capsules connected by hydrogen bonds of water molecules. CCDC: 271400.展开更多
A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal ...A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal structure of the complex belongs to Monoclinic system with space group P21/c, a=0.969 7(3) nm, b=1.914 6(6) nm, c=1.803 1(6) nm, β=91.524(5)°, V=3.346 6(18) mm3, Z=4, Dc=1.863 g·cm-3, μ=2.645 mm-1. The coordination geometry configuration of Er3+ center is tricapped trigonal prism. The structures of the title compound exhibit a novel 1D Ladder-like chain.展开更多
通过自发交换法使Au与非水性锂空气电池中的泡沫镍集流体发生反应,实现了金纳米层催化剂的原位负载.将其作为非水性锂空气电池正极,研究了不同气氛(纯氧、大气和模拟大气)下电池的电化学性能.结果表明,Au纳米层催化剂对氧还原反应/氧逸...通过自发交换法使Au与非水性锂空气电池中的泡沫镍集流体发生反应,实现了金纳米层催化剂的原位负载.将其作为非水性锂空气电池正极,研究了不同气氛(纯氧、大气和模拟大气)下电池的电化学性能.结果表明,Au纳米层催化剂对氧还原反应/氧逸出反应起到了双功能催化作用,使得氧气电极在不同气氛下的首次放电容量与电压均显著提升,容量分别提升至9169,1604和1853 m A·h/gcarbon;同时氧气电极在模拟大气下的充电过电位降低,能量效率提高,循环性能得到一定提升.展开更多
文摘A novel complex of a new 1,4-dicyclohexyl cucurbituril(DCYQ6) with sodium(I) ion was synthesized, and the crystal structure was determined by X-ray diffraction technique. In this self-assembled entity both the cavity interaction of DCYQ6 included a nitrate anion and the portal interaction of the dipole carbonyls of DCYQ6 with sodium cations lead to form self assembled molecular capsules. The crystal structure of the entity shows a packing of the self assembled molecular capsules connected by hydrogen bonds of water molecules. CCDC: 271400.
文摘研究了利用NaI(f 76 mm?6 mm)探测器不同能量光子的全能峰相对效率曲线和分析纯KCl测量水溶液中24Na活度的方法。所谓相对效率是指不同能量对某一能量全能峰计数效率的归一值。这种方法不需要用活度精确已知的任何核素的标准溶液进行刻度。相对效率曲线的建立是将不同能量 g 光子的相对效率与能量E的关系用最小二乘法拟合成一个函数f(E)=A+BE+CE2+DE3+UE4。这些 g 能量(以MeV为单位)包括56Mn的0.8468、1.8108、2.113,27Mg的0.8438、1.0144,82Br的1.0439、1.3175、1.4748,以及38Cl 的1.6422和2.1676。放射性核素都是利用一个约为130靏的252Cf中子源活化产生。本方法的原理可用于非24Na 其他放射性核素溶液的活度测量,并且更适合于Ge 探测器。当用Ge探测器时,仅用82Br的各种 g 光子能量就能确定全能峰相对效率曲线。
文摘A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal structure of the complex belongs to Monoclinic system with space group P21/c, a=0.969 7(3) nm, b=1.914 6(6) nm, c=1.803 1(6) nm, β=91.524(5)°, V=3.346 6(18) mm3, Z=4, Dc=1.863 g·cm-3, μ=2.645 mm-1. The coordination geometry configuration of Er3+ center is tricapped trigonal prism. The structures of the title compound exhibit a novel 1D Ladder-like chain.
文摘通过自发交换法使Au与非水性锂空气电池中的泡沫镍集流体发生反应,实现了金纳米层催化剂的原位负载.将其作为非水性锂空气电池正极,研究了不同气氛(纯氧、大气和模拟大气)下电池的电化学性能.结果表明,Au纳米层催化剂对氧还原反应/氧逸出反应起到了双功能催化作用,使得氧气电极在不同气氛下的首次放电容量与电压均显著提升,容量分别提升至9169,1604和1853 m A·h/gcarbon;同时氧气电极在模拟大气下的充电过电位降低,能量效率提高,循环性能得到一定提升.
