D,L-1,2,2-三甲基环戊烷-1,3-二胺硝酸镍配合物的合成、结构及其和手性D-(+)-1,2,2-三甲基环戊烷-1,3-二胺氯化镍配合物的对比分析(英)

A nickel(Ⅱ) complex [Ni(La)₂](NO₃)₂ (1) with bidentate racemic 1,2,2-trimethylcyclopentane-1,3-diamine ligand has been synthesized and characterized by IR, EA, ES-MS, and its X-ray diffraction study reveals that the nickel(Ⅱ) center is tetra-coordinated by one D- and one L- diamine ligands, and a three-dimensional hydrogen-bond-sustained network is formed in the solid state by means of the eight-membered N-H…O hydrogen bond cycle. This compound also supplies a good comparison to the chiral complex [Ni(L_b)₂]Cl₂·2H₂O (2) (L_b=D-(+)-1,2,2-trimethylcyclopentane-1,3-diamine). CCDC: 218122.     

FREQUENCY DEPENDENCE OF THE DIELECTRIC RELAXATION OF 1,2-POLYBUTADIENES

The dielectric loss factor and permittivity of a series of 1, 2-polybutadienes with different contents of 1, 2-units and different contents of syndiotactie 1, 2-units were determined over a frequency range from 30Hz to 100KHz at different temperatures. The WLF equation was evaluated for various samples with T_θat 100KHz as a reference temperature and the master curves of various samples have been constructed, which are in accordance with those calculated by Havriliak-Negami equation. The frequency dependence of the dielectric relaxation of 1, 2-polybutadienes was investigated over a frequency range from 10~0 Hz to 10~(12) ZHz in terms of the experimental data and the master curves.     

纳米ZrO2的合成对负载Ni催化剂的CH4/CO2重整反应的影响

采用共沉淀法、醇热合成法和干法分别合成了纳米ZrO2（ZrO2 CP、ZrO2 ET和ZrO2 S），用XRD、 BET、SEM等对其结构和表面性质进行表征，以CH4/CO2重整为探针反应研究了不同方法合成的纳米ZrO2负载Ni催化剂的催化性能，并与载体的物化性质进行了关联。实验结果表明，以干法合成的纳米介孔ZrO2 S具有较大的比表面积（133m2/g）和较好的孔径分布(4.9nm)，Ni/ZrO2 S催化剂在CH4/CO2重整反应中表现出较好的催化性能。     

预浓缩/色谱-质谱测量大气中挥发性有机硫化合物

硫循环是生物地化循环中最复杂的循环之一. 近年来,由于人类活动的影响,大气中硫化物含量急剧增加. 这些硫化物与大气中自由基发生作用,形成SO2、H2SO4和硫酸盐, 导致环境酸化, 酸沉降加剧.硫酸盐气溶胶的形成还改变了大气云层特性,影响大气臭氧含量的垂直分布以及大气热量辐射,对温室效应有一定的贡献[1-3].挥发性有机硫化合物中的甲硫醇(MT),甲硫醚(DMS),二硫化碳(CS2)和二甲二硫(DMDS)还是国家标准控制《恶臭污染物排放标准》中规定的4种恶臭气体,对大气环境质量造成一定的影响.     

THE SOLID STATE REACTIONS AND TRANSITIONS IN HIGH POLYMERIC SYSTEMS Ⅲ. THE BULK CRYSTALLIZATION OF LANTHANIDECATALYTICALLY POLYMERIZED POLYDIENES

For the mechanism of isothermal bulk crystallization of high polymers, beside the nucleation and growth steps, the unimpingement of growing crystal aggregates should be taken into account for the modification of the Avrami equation. Starting from Poisson distribution function of growing crystal aggregates, the probability of the unimpinging ones should be P(0)+P(1), then the Q-modified Avrami equation thus derived can be expressed aswhere V0 represents the volume fraction of crystal aggregates at crystallization time t at a given temperature, while the exponent n on t relates to the mode of nucleation and growth, and K_q is the corresponding shape factor. This Q-modified one is verified satisfactory by the isothermal bulk crystallization of lanthanidecatalytically polymerized polybutadiene (Ln-PB), polyisoprene (Ln-PIR) and their copolymers (LnPB/IR). Furthermore, the proposed mechanism is well identified by the change of morphological state during the course of crystallization of the corresponding east film of Ln-PB TR (92/8) at-60°(Fig. 1).Upon examination of the influence of the number of entanglement on crystallization rate, it reveals the existence of two stages of entanglementation, the primary and the secondary ones (Fig. 19)The equation for dependence of molecular weight and entanglement on bulk crystallization rate has been derived as Eq. 13 or 18 for Ln-PB, and verified by the experimental rate data of well fractionated Ln-PB samples crystallized at -9.1 to -15℃(Fig.20).     

开链冠醚Schiff碱-稀土配合物的合成、表征及近红外发光光谱研究

合成了3个新型开链冠醚Schiff碱-稀土离子三元配合物RE(H2L)(Mq)(NO3)3,其中RE=Nd3 ,Er3 ,Yb3 ,配体H2L=N,N-双(邻羟苯亚甲基)-3,6-二氧杂-1,8-二氨基辛烷,Mq为8-羟基喹哪啶.采用元素分析、红外光谱(IR)、紫外-可见吸收光谱(UV-vis)、热重-差热分析(TG-DTG)等手段对配合物的组成结构进行了表征.测定了3种新型结构稀土三元配合物在不同温度(77 K和300 K)时的近红外发光光谱.     

气相[（SiO2）nX]^—团簇产生机理

利用ＸｅＣｌ准分子激光烧蚀多种硅氧多孔结构材料，在负离子通道测得丰富的「（ＳｉＯ２）ｎＸ」＾－负离子团簇，并讨论了多孔网结构和表面活性基团的分布对激光能量的吸收，传输及团簇产生的重要作用。     

天然气的组成与应用

由于我国天然气资源的大量发现以及原油可开采量的减少,利用天然气的技术和规模都获得快速发展,天然气的研究与开发越来越受到人们的关注。本文介绍了天然气的组成与最新的应用进展。     

离聚体的结构表征 Ⅲ.EXAFS法测定含氟的铜离聚体的精细结构

本文报道了用先进的EXAFS及ESR等方法研究了羧酸型含氟的铜(Ⅱ)离聚体离子微区的内部精细结构,结果表明,铜离聚体的离子微区主要由羧酸根桥键的双核配位结构单元及平面四方形的配位结构单元等聚集而成。在双核配位结构单元中第一层为Cu~(2+)—O配位,配位数为4,配位键键长为1.96A,第二配位层为Gu~(2+)—Cu~(2+)配位,Cu~(2+)—Gu~(2+)间距为2.64A。平面四方形的配位结构单元Cu~(2+)—O的配位数为4,配位键键长为1.96A。共聚物中羧基含量对离聚体的基本配位结构单元和离子微区的精细结构影响较小,但对微区大小有影响。     

1,2-聚丁二烯介电松弛的复平面分析

本文对1,2-聚丁二烯的介电松弛进行了复平面分析.结果表明,在1,2-聚丁二烯的玻璃化转变过程中,ε″(ω)与ε＇(ω)的关系满足Havriliak-Negami方程.由复平面图求出了样品的静态和光频下的介电系数,平均松弛时间和松弛时间分布参数.利用所得数据讨论了1,2-聚丁二烯在玻璃化转变过程中的构象变化、松弛时间分布和平均偶极矩等问题.