脲基苯乙炔4-′(对甲基苯基)-6-苯基-2,2′-二联吡啶铂(II)络合物的合成

本文通过异氰酸酰化反应合成了含有脲基的苯乙炔新型配体及以它作为辅助配体的4′-(对甲基苯基)-6-苯基-2,2′-二联吡啶铂(II)络合物,初步研究了铂(II)络合物的光物理性质,发现由于脲基的存在,当浓度大于3.32×10-5mol/L时铂(II)络合物能够发生分子间簇集.     

新型固液双重致孔球形离子交换剂的制备及其性能研究

以甲基丙烯酸缩水甘油酯为单体 ,采用固液联合致孔方式 ,通过一步悬浮聚合制备了一种新型双孔高分子球形载体 .经化学修饰后 ,得到含二乙胺羟丙基的阴离子交换剂 (介质A) .优化了制备条件 .并与用相同方法制备的但仅含有机溶剂致孔剂的介质B进行了比较 .介质A和B均具有较高的静态吸附容量和机械强度 .由于介质A内含有流动相可以对流通过的大孔 ,因此其动态吸附容量远高于介质B ,并且在较高的流速下表现出较好的色谱流动性能     

TCDD的密度泛函理论研究

用B3LYP/6-311G~(**)方法全优经计算22个四氯二苯并对二（左口右恶）英（ 简称TCDD）分子，得到几何构型、总能量、标准熵、标准焓和标准自由能。将2， 3，7，8－TCDD的计算构型与X射线衍射实验测定值进行了比较。计算结果表明，总 能量、标准焓和标准自由能与氯原子量换位置的相关性很高（r > 0.997）.1,3,6, 8-TCDD的总能量处自由能最低，即最稳定，以此参照，得到异构体的总能量的相对 稳定性顺序和自由能的相对稳定性顺序。1,3,7,9－TCDD的稳定性次之，1,3,7,8- TCDD居第三，将这二个顺序与焚烧炉产生的TCDD异构体和合成的异构体对的生成面 分比进行了比较，说明焚烧炉中产生的TCDD和合成的TCDD对的分布主要受热力学控 制。     

有规立构聚苯乙烯的稀溶液性质

本文报导了有规立构聚苯乙烯,无规立构聚苯乙烯和1∶1混合有规和无规立构聚苯乙烯的分级、粘度和光散射测试结果。发现上述三种聚苯乙烯试样的[η]-M的依赖关系、第二维利系数和均方末端距(当分子量相同时)是有差别的。这种差别超出实验误差范围,而作者们认为是合理的。从而讨论了前人在类似的工作中所得到的结果。     

热定型聚酯纤维内应力与晶格变形的关系

<正> 结晶学家认为低分子物结晶虽可能存在一定缺陷和变形,但一般都具有一定的晶胞参数。这一概念对于高分子物结晶已不再正确。Bosley认为成形、热处理、冷却速率和杂质的存在皆可引起晶格变形;Fakirov故意在PET中加入少量杂质,却未引起变形。至今,PET已累积了7组晶胞参数,8个计算所得的晶区密度显示了较大幅度的波动(见     

Synthesis and Structure of a Dinuclear Copper（Ⅱ）- ditetrazolate Involving in situ Ligand Synthesis

The hydrothermal reaction of 1,2-dicyanobenzene with NaN3 in the presence of CuCl2, 2,2′-bipyridine and H2O affords a novel dinuclear copper(II)-ditetrazolate, [Cu(bpy)- (pdtz)]2 (Hpdtz = 5,5′-1,2-phenylene-ditetrazole, bpy = 2,2′-bipyridine). The pdtz ligand is generated in situ through Sharpless 2 3 cycloaddition reaction. Its crystal structure was deter- mined by single-crystal X-ray diffraction method. The crystal crystallizes in the monoclinic system, space group P21/n with a = 8.2096(16), b = 18.580(4), c = 11.838(2) , β = 103.12(3)o, V = 1758.5(6) 3, Z = 2, Mr = 863.83, Dc = 1.631 g/cm3, F(000) = 876 and μ = 1.272 mm-1. In this novel dinuclear structure, the pdtz ligand adopts a peculiar μ2-η1,η2 coordination mode.     

微波辐射下苯亚磺酸钠的S-烃基化

在微波辐射下，不用任何有机溶剂和无机载体，苯亚磺酸钠和卤代烃能迅速发生反应生成相应的S-烃基化产物。     

Paleomagnetic Results of Later Paleozolic Rocks From Alashan Area of Western North China Block

In order to contribute to the Apparent Polar Wander Path (APWP) of the North China Block (NCB) , we collected paleomagnetic samples of Late Paleozoic rocks from the northern and southern margins of the Alashan (Alxa) terrane (the western part of Inner Mongolia and northern parts of Gansu and Ningxia Provinces) and adjacent regions. Laboratory work revealed different types of demagnetization behavior and isolated a higher temperature characteristic component in most of the samples. Results of IRM experiments show high thermal stability and high coercivities for the magnetic carriers in these rocks. The characteristic component passed the fold and/or reversal tests, suggesting that the characteristic components were probably primary. On the basis of comparing the paleomagnetic results with the geologic evidence, we discuss the tectonic implications. In the Late Paleozoic, the Alashan region had been part of the NCB and was not connected with the northern and southern blocks. During the Carboniferous Alash     

TRANSFER OF FOREIGN GENES BY ELECTROPORATION AND THEIR EXPRESSION IN MAMMALIAN CELLS

Expression of foreign genes transferred into mammalian cells by electroporation has been studied. The pX1TK gene, pSV2Neo gene and pUCEJ oncogene have been introduced into MLTK-cells and NIH/3T3 cells, respectively. Stable transformation transient expression of TK gene by MLTK-cells as well as stable and malignant transformation of NIH/3T3 cells have been obtained. Transient expression frequency is about 80% and stable transformation frequency is about 10~(-4). Integration of foreign genes into the cellular genome was verified with molecular hybridization. Tumor development was observed after inoculation of transformed celts into nude mice.     

SA耐火材料多晶结构与性能的研究

本实验采用磨具废砂和炉皮SiC废砂生产SA耐火材料，通过XRD分析和计算机处理确定各试样中的晶相（4H－SiC，33R－SiC，3C－SiC，α－Al2O3，β-石英和Al6Si2O13）及其各相的含量。通过材料性能与结构综合分析，确定较好的配方，其含量：磨具废砂50％，炉皮砂45％，结合剂5％，外加矿化剂2％。