膦酸酯钕盐催化异戊二烯活性聚合

以Ｎｄ（Ｐ５０７）３／Ａｌ（ｉ－Ｂｕ）３／Ａｌ２Ｅｔ３Ｃｌ３为催化剂，对异戊二烯的活性聚合进行了研究。结果表明，在此催化体系中异戊二烯聚合是以活性链机理进行的。并在活性聚合基础上进行了异戊二烯－丁二烯嵌段共聚合，通过对嵌段共聚物ＧＰＣ测定和完全氢化处理，证明了异戊二烯－丁二烯嵌段共聚物的生成，从另一侧面证实了异戊二烯活性聚合的特点。

一种新型塑料增韧剂——核壳结构聚合物

本文综述了核－壳结构聚合物用于通用塑料和工程塑料增韧的最新进展，并对该领域的研究进行了展望

W-183 NMR characterization of rare earth heteropolymetalates in aqueous solution

W-183 NMR spectra were obtained for [La(AsW11O39)(2)](11-), [La(As2W17O61)(2)](17-), [La(SiW9Mo2O39)(2)](13-), [LaSb9W21O86](16-), [LaAs4W40O140](25-) and alpha-, beta-[(CeO)(3) . (SiW9O34)(2)](14-) complexes, Tungsten NMR studies showed that the C-s symmetry of the square antiprism for [La(ASW(11)O(39))(2)](11-) and [La(As2W17O61)(2)](17-) anions keep constant in aqueous solution; the lanthanide accupied the central S-1 site in [LnSb(9)W(21)O(86)](16-) and [LnAs(4)W(40)O(140)](25-) complexes, respectively, and lanthanide metal cations gave [(CeO)(3) . (SiW9O34)(3)](14-) type of complexes with SiW9O3410-.

稀土杂多化合物在溶液中的￣（183）W核磁共振表征

~（１８３）Ｗ核磁共振研究确认，Ｌａ（ＡｓＷ_（１１））_２、Ｌａｍ（Ａｓ_２Ｗ_（１７））_２在溶液中仍保持其四方反棱柱的Ｃ_３结构，Ｌａ（ＳｉＷ_９ＭＯ_２）_２阴离子中，２个Ｍｏ原子取代了２个等价的Ｗ原子，在穴状杂多阴离子ＬｎＡｓ_４Ｗ_（１０）和ＬｎＳｂ_９Ｗ_（２１）中，稀土离子占据中心Ｓ_１位置，ＳｉＷ_９与稀土离子生成（ＬｎＯ）_３（ＳｉＷ_９）_２型杂多阴离子。

一种无机高分子——聚硅烷

综述介绍聚硅烷的合成方法及其电子结构、分子结构、微观结构和聚集态结构等。重点介绍聚硅烷的分子链间的交联反应及其在非氧化硅陶瓷制备方面的应用,聚硅烷用来制备陶瓷/金属复合材料,聚硅烷的光化学性质及其作为显微光刻材料在微电子中的应用,以及作为光电子器件中的波导介质等。

外消旋丙一丝二肽及其稀土配合物的NMR性质

研究了不同ｐＨ值下的Ｄ，Ｌ－丙氨酰－Ｄ，Ｌ－丝氨酸（Ａｌａ－Ｓｅｒ）及其稀土配合物的１Ｈ、１３ＣＮＭＲ谱，对于该种二肽的不同旋光异构体，有可能对其谱线进行区分和指认。测定了酸解常数和稀土配合物的络合稳定常数。通过分离Ａｌａ－Ｓｅｒ的重稀土配合物的接触位移和偶极位移。分析了不同异构体配合物的ＮＭＲ位移的原因。

立方钙钛矿型复合氟化物晶体的化学键和离子行为

本文利用键子式方程和有效价电子电荷的概念详细计算了立方钙钛矿型KMF_3(M=Mg、Mn、Co、Ni、Zn)晶体的化学键参数,键性,晶体中离子的半径及离子的电子极化率,结果发现,F离子在晶体中产生形变,形变行为和F的极化率以及化学键的共价性有相同的规律。

A STUDY OF MODE-I DELAMINATION RESISTANCE OF A THERMOPLASTIC COMPOSITE

This paper describes the mode I delamination behaviour of a unidirectional carbon-fibre/poly(phenylene ether ketone)(PEK-C) composite. Tests have been performed on double cantilever beam (DCB) specimens. Several data reduction schemes are used to obtain the critical strain energy release rate, G(IC), and the results are compared. It is shown that when using a DCB test to determine the fracture toughness, corrections must be employed. The experimental methods have been described for ascertaining the correction terms, and the results are consistent after modification. Some of the authors' results are different from those of other authors, particularly the negative correction term for crack length, the larger exponent (n > 3) in the relationship C = Ra(n), and decrements of flexural modulus with the crack growth when using the simple beam theory to predict the bending behaviour of DCB specimens. The possible reasons are discussed.

A NEW HYDROGEN SENSOR WITH RARE-EARTH COMPLEX FLUORIDE

A new type of solid-state galvanic cell for detecting a small amount of hydrogen in air at room temperature is proposed. The sensor cell is a potentiometric cell using Ce0.95Ca0.05F2.95 as solid-state electrolyte. The cell exhibits good sensing properties to hydrogen in air at room temperature.

NMR-STUDIES ON THE COORDINATION OF RARE-EARTHS WITH GLYCYL-DL-VALINE AND THE CONFORMATION OF THEIR COMPLEX IN AQUEOUS-SOLUTION

In this paper lanthanide-induced shifts have been measured for C-13 and H-1 nuclei of glycyl-DL-valine in the presence of three lanthanide cations (La3+, Ho3+ and Yb3+) in aqueous solution. The stability constants of the coordination compounds of rare earths (Ho, Yb) with glycyl-DL-valine have been calculated. The coordination of rare earths with the ligand has been discussed. The simulation for conformation of lanthanide coordination compounds with glycyl-DL-valine shows that the ligand is coordinated to lanthanide ion through oxygen atoms of carboxyl group and the bond length of Ln-O is 0.226 nm. In the coordination compounds glycyl-DL-valine is in extended state with minimal steric hindrance.

用自动元素分析仪测定含氟化合物中的碳、氢

本文介绍用兰州化物所制备的Ag_2WO_4,MgO/AgVO_3催化剂分析含氟量很高的高分子化合物中的碳、氢的方法。该法的优点是快速、简便、燃烧温度低。测定的绝对误差不大于0.3%。 2 仪器和试剂: Carlo Erba 1106型元素分析仪,精度为lμg的天平,锡箔压制的样品小舟。Ag_2WO_4,MgO/AgVO_3兰州化物所制,镀银还原铜自制。氧气、氦气的纯度为99.999％。

水溶液中甘氨酰-缬氨酸与稀土配位作用及其配合物构象的NMR研究

本文测定了在三种不同稀土离子(镧La~(3+)、钬Ho~(3+)和镱Yb~(3+)的水溶液中甘氨酰-缬氨酸的~1H和~(13)C稀土诱导位移。计算了Ho、Yb与甘氨酰-缬氨酸配合物的稳定常数,讨论了稀土与该配体的配位作用及对配合物构象进行研究,发现配位后的甘氨酰-缬氨酸以一种空间位阻较小的伸展构象存在。

SYNTHESES AND CRYSTAL-STRUCTURES OF TRIINDENYLLANTHANIDE COMPLEXES (ETA-5-C9H7)3LN.OC4H8 (LN=ND,GD,ER)

The complexes named in the title (eta-5-C9H7)3Ln.OC4H8 (Ln = Nd, Gd, Er) were synthesized by the reaction of anhydrous lanthanide trichlorides with indenyl potassium and cyclooctadienyl potassium (1:2:1 molar ratio) in THF. The complexes were characterized by elemental analysis, infrared and H-1-NMR spectroscopy, and mass spectrometry. In addition, the crystal structures of (eta-5-C9H7)3Nd.OC4H8 (1) and (eta-5-C9H7)3Gd.OC4H8 (2) were determined by an X-ray diffraction study. Complexes 1 and 2 belong to hexagonal space group P6(3) with unit cell parameters a = b = 11.843(3), c = 10.304(4) angstrom, V = 1251.7(9) angstrom-3, D(c) = 1.49 g.cm-3, Z = 2 for 1, and a = b = 11.805(2), c = 10.236(2) angstrom, V = 1235.4(6) angstrom-3 D(c) = 1.54 g.cm-3, Z = 2 for 2. The structures were solved by Patterson and Fourier techniques and refined by least-squares to final discrepancy indices of R = 0.049, R(w) = 0.053 using 925 independent reflections with I greater-than-or-equal-to 3-sigma(I) for 1, and R = 0.023, R(w) = 0.025 using 1327 independent reflections with I greater-than-or-equal-to 3-sigma(I) for 2. Coordination numbers for Nd3+ and Gd3+ are 10; the average bond lengths Nd-O and Gd-O are 2.557(21) and 2.459(13) angstrom, respectively. The structural studies showed the complexes to have 3-fold symmetry, but the THF molecule has no such symmetry; consequently the arrangement of carbon atoms in the THF molecule are disordered.

中国红参中碳、氢、氮元素和蛋白含量的自动分析

人参为五加科植物人参(Panax ginseng C.A.Mey.)的干燥根。红参则是鲜人参洗净后经高温蒸气加热后干燥而制得的产品。有关人参中皂甙、氨基酸、多肽、挥发油、微量元素等成分的研究国内外均有大量的报道。但关于红参中碳、氢、氮元素的研究以及自动定量方法国内外尚未见报道。 1.仪器:1106型元素自动分析仪(意大利)其配套设备包括B-5000型记录仪,微处理机和电子天平。 2.人参样品:1号红参由吉林省抚松县参茸公司提供。2号红参由抚松县漫江参场提供。3号红参为抚松县参场提供。4号红参由延边地区提供。5号红参由集安县新开河参场提供。上述样品均为6年生。