核磁共振氢谱内标法测定茚地普隆的含量

建立了测定无对照品的新型非苯二氮唑类镇静催眠药茚地普隆含量的快速、专属、简单的核磁共振氢谱内标法。用Varian Mercury Plus400MHz核磁共振谱仪,在25℃、以氘代氯仿为溶剂、3,4-二硝基甲苯为内标、观察频率400.121MHz、谱宽6410Hz、90°脉冲宽度6.45μs、采集时间4s和延迟时间15s的条件下采集试样的氢谱。以化学位移分别在δ8.72和δ8.72处的茚地普隆和3,4-二硝基甲苯的单峰作为定量峰,其峰面积比(As/Ar,y)与其质量比(ms/mr,x)的线性回归方程为y=6.1458x 0.0055,相关系数为r=0.99996,含量测定重复性实验的RSD为0.29%(n=6)。分析结果表明,在没有对照品的情况下,核磁共振氢谱内标法,可用于茚地普隆的含量测定和质量控制。     

Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

The potential energy surfaces of even-even 142-156Ba are investigated in the constrained reflectionasymmetric relativistic mean-field approach with parameter set PK1. It is shown that for the ground states, 142Ba is near spherical,156Ba well quadrupole-deformed, and in between 144-154Ba octupole deformed. In particular, the nuclei 148,150Ba with N=92, 94 have the largest octupole deformations. By including the octupole degree of freedom, energy gaps N = 88, N = 94 and Z = 56 near Fermi surfaces for the singleparticle levels in 148Ba with β2 ～ 0.26 and β3 ～ 0.17 are found. Furthermore, the performance of the octupole deformation driving pairs (ν2f7/2, ν1i13/2) and (π2d5/2, π1h11/2) is demonstrated by analyzing the singleparticle levels near Fermi surfaces in 148Ba.     

High-Spin Level Scheme of Odd-odd 142Pm

The level structure of doubly odd nucleus ¹⁴²Pm has been studied via the ¹²⁸Te(¹⁹F,5nγ)¹⁴²Pm reaction in the energy region from 75 to 95MeV. In-beam γ rays were measureed including the excited function, γ-ray singles and γ-γ coincidences in experiment. The level scheme of ¹⁴²Pm has been extended up to excitation energy of 7030.0keV including 25 new γ rays and 13 new levels. Based on the measured γ-ray anisotropies, the level spins in ¹⁴²Pm have been suggested.     

异双核配合物CuZnTS·OH的合成和晶体结构

电化学性质;异双核配合物CuZnTS·OH的合成和晶体结构     

不对称草酰胺桥联异三核配合物{[Ni(oxbe)]2Cu(H2O)2}·2.5DMF的合成和晶体结构

合成了不对称草酰胺桥联异三核配合物{[Ni(oxbe)]2Cu(H2O)2}2.5DMF [H3oxbe为N-(2-羧基苯)-N-(2-氨乙基)草酰胺]。用单晶X-射线衍射法测定了其晶体结构。该晶体属单斜晶系,空间群C2/c,晶胞参数a = 22.590(7),b = 17.341(4),c = 10.900(3) ,β= 115.80(2),V = 3844.1(18) 3, Ni2CuC29.5H41.5N8.50O12.5, Mr = 896.17, Z = 4,Dc = 1.5481g/cm3,μ(MoKα) = 1.588 mm-1,F(000) = 1852,R = 0.0534,wR = 0.1334(I>2(I)), 2051个可观察衍射点。此三核配合物的结构单元具有中心对称性, 铜离子位于中心由6个氧原子构成的八面体中,2个镍离子则分别位于两端处在由N3O构成的近似平面正方场中,中心Cu2+与两端的Ni2+通过草酰胺阴离子桥联在一起。     

自洽处理对关联的RMF+SLAP方法对Sn核性质的研究

在自洽的相对论平均场理论框架下, 用严格保持粒子数守恒的类壳模型方法, 即RMF+SLAP方法,研究了Sn同位素链的性质并与没有考虑对关联对平均势场影响的非自洽计算进行了比较.结果表明, 自洽的RMF+SLAP方法能够正确给出原子核形变随平均对力强度的变化, 给出Sn同位素链的每核子结合能, 单中子与双中子分离能, 四极形变随质量数A的变化等的很好描述.表明了研究原子核性质时, 正确和自洽处理对关联以及堵塞效应的重要性.     

Zn(Ⅱ)在锌电极上的电沉积机理

在Zn(Ⅱ)-NH_4Cl准中性体系中,采用循环伏安法(CV)研究了Zn~(2+)在锌电极上的反应方式,通过计时电流法(CA)研究了Zn~(2+)沉积的成核方式,利用交流阻抗谱(EIS)考察了不同过电位时Zn~(2+)沉积的阻抗行为。结果表明:Zn~(2+)的电沉积是一个不可逆电极反应,以两步骤单电子串联的方式进行,第一步为速控步;电极反应的电荷传递系数与锌电极的表面结构有关。在恒电位条件下,体系中锌电极上Zn~(2+)的结晶近似于三维瞬时成核方式。Zn~(2+)的沉积经历了覆盖、吸附成膜、大量晶核形成等过程,该过程随着控制电位的负移由电化学极化过渡到电化学极化-浓差极化混合控制阶段。最后给出了Zn~(2+)在锌电极上电沉积过程的机理。     

Substituent Effect to Fine-Tune Energy Levels of Atom-Precise [MoOS3]2− Modified Copper(I) Thiolate Clusters Boosting Recyclable Photocatalysis

The propulsion of photocatalytic hydrogen (H₂) production is limited by the rational design and regulation of catalysts with precise structures and excellent activities. In this work, the [MoOS₃]²⁻ unit is introduced into the Cu^I clusters to form a series of atomically-precise Mo^VI−Cu^I bimetallic clusters of [Cu₆(MoOS₃)₂(C₆H₅(CH₂)S)₂(P(C₆H₄−R)₃)₄] ⋅ xCH₃CN (R=H, CH₃, or F), which show high photocatalytic H₂ evolution activities and excellent stability. By electron push-pull effects of the surface ligand, highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of these Mo^VI−Cu^I clusters can be finely tuned, promoting the resultant visible-light-driven H₂ evolution performance. Furthermore, Mo^VI−Cu^I clusters loaded onto the surface of magnetic Fe₃O₄ carriers significantly reduced the loss of catalysts in the collection process, efficiently addressing the recycling issues of such small cluster-based catalyst. This work not only highlights a competitively universal approach on the design of high-efficiency cluster photocatalysts for energy conversion, but also makes it feasible to manipulate the catalytic performance of clusters through a rational substituent strategy.     

Ligand-to-metal ratio controlled assembly of nanoporous metal-organic frameworks

Two bilayered metal-organic frameworks with nanoporous channels were synthesized at different ligand-to-metal ratios, which demonstrated an interesting crystal-to-crystal transformation property and a special fluorescent response to the different guest molecules included.     

Lie symmetries and exact solutions for a short-wave model

In this paper, the Lie symmetry analysis and generalized symmetry method are performed for a short-wave model. The symmetries for this equation are given, and the phase portraits of the traveling wave systems are analyzed using the bifurcation theory of dynamical systems. The exact parametric representations of four types of traveling wave solutions are obtained.