FePc结构对Pd(OAc)_2/HQ/FePc催化环己烯氧化活性的影响

在乙腈酸性水溶液中 ,不同来源酞菁铁 (FePc)和 Pd(OAc)2/HQ（氢醌）组成的催化体系在环己烯氧化反应中有明显不同的催化活性 .通过 IR、 M ssbauer、 XPS、 XRD、 SEM、 BET等技术对酞菁铁的分析表明 ,由酞菁铁组成的多组份催化体系的催化活性与酞菁铁中的μ-氧酞菁铁含量、酞菁铁结晶度和表面形态有关.

Calculation of chemical bond parameters in La1-xCaxCrO3 (0.0 <= x <= 0.3)

The chemical bond parameters, that is, bond covalency, bond susceptibility, and macroscopic linear susceptibility of La1-xCaxCrO3 (x = 0.0, 0.1, 0.2, 0.3) has been calculated using a semiempirical method. This method is the generalization of the dielectric description theory proposed by Phillips, Van Vechten, Levine, and Tanaka (PVLT). In the calculation of bond valence, two schemes were adopted. One is the bond valence sums (BVS) scheme, and the other is the equal-valence scheme. Both schemes suggest that for the title compounds bond covalency and bond susceptibility are mainly influenced by bond valence and are insensitive to the Ca doping level or structural change. Larger bond valences usually result in higher bond covalency and bond susceptibility. The macroscopic linear susceptibility increases (only slightly for BVS scheme) with the increasing Ca doping level. (C) 1999 John Wiley & Sons, Inc.

硝酸铕和铽与穴醚固体配合物的发光

应用荧光光谱研究了稀土硝酸铕和硝酸铽的穴醚配合物，结果指出配合物的发光强度强于稀土硝酸盐，说明有机大环配体穴醚能有效地吸收和传递能量给稀土离子．

CHARACTERIZATION OF OXIDES AND HALOGENIDES OF CERIUM BY ESCA .2. AUGER PEAKS OF CE-M5N45N45

The larger chemical shift of cerium compounds was discoveried. The chemical states of the cerium compounds were identified by the chemical shifts of Auger energy. The changes in Anger energy and parameters are principally due to the changes in extra-atomic relaxation or polarization energy. The increase of the polarizable properties in anions of cerium compounds corresponds to the increase of Auger energy and parameter. The Auger parameter can be measured more accurately. Ce(CF3COO)(x)Cl-3-x was also studied by ESCA. It is shown that the electron density at cerium atom increases with the increase of x, while the electron density at oxygen atom decreases.

铈卤氧化物的ESCA表征（Ⅱ）──Ce的M_5N_（45）N_（45）俄歇峰

研究了ＸＰＳ诱导的ＣｅＭ５Ｎ４５Ｎ４５俄歇峰，由于其终态空穴处于芯能级，故俄歇峰有较好的分辨率。从ＣｅＭ５Ｎ４５Ｎ４５的俄歇峰可获得中心离子Ｃｅ的电子云密度等信息，发现其俄歇参数与配位体的极化变形程度有关，从而解释了双烯烃定向聚合必须有稀土卤氧键存在的原因。

INVESTIGATION ON MECHANISMS FOR THE ELECTROOXIDATION OF SOME BILE-PIGMENTS BY SPECTROELECTROCHEMISTRY

The electrooxidation behavior of bilirubin (BR), biliverdin (BV), purpurin (Pu), and choletelin (Ch in dimethylformamide (DMF) have been investigated bv voltammetry, in situ electron spin resonance (ESR) thin-layer spectroelectrochemistry and especially i

聚芳醚酮/水杨醛铝引发环氧树脂的潜伏性固化(英文)

本文提出一种新型潜伏性固化剂——聚芳醚酮/水杨醛铝,研究了这种固化体系引发环氧树脂固化的机理,固化剂对反应速度,固化物力学性能和电性能的影响,证明这种固化体系具有明显的潜伏效果,并能改善固化物的高温电性能。

AN EXPERT SYSTEM FOR SOLVENT-EXTRACTION OF RARE-EARTHS

An expert system for solvent extraction of rare earths has been developed using LISP. The goal of this project was to mimic the chemists' inferential abilities to assist in the process of solvent extraction of rare earths. The system includes frequently used extractants, separation of specific rare earths, recommendation of procedures for the separation of mixtures of rare earths using (2-ethylhexyl)phosphonic acid 2-ethylhexyl monoester, selection of parameters for counter-current extraction and methods for evaluation of the technique, and the economics of the processing. The expert system runs on an IBM-PC/XT.

N-乙基吡啶四(α-噻吩甲酰三氟丙酮)合铕的合成和晶体结构

合成了标题络合物的晶体,在四圆衍射仪上测得其晶体结构。晶体Eu(TTA)_4Epy属三斜晶系,P(?)空间群,中心离子Eu(Ⅲ)和4个TTA~-通过8个氧原子螯合配位,Epy为外界阳离子。晶胞参数如下:a=12.437(5),b=17.816(3),c=10,706(3)(?),α=90.92(2)°,β=102.01(3)°,γ=87.10(2)°,Z=2。此外,还对该化合物的热稳定性、红外及紫外可见光谱以及荧光性质进行了研究。

1-甲基-1,4,7,10-四氮杂环十二烷镧配合物的合成及晶体结构

合成了1-甲基-1,4,7,10-四氮杂环十二烷(L)配体。在乙腈中培养了La(L)(CH_3CN)-(H_2O)(CF_3SO_3)_3配合物单晶,测定了其红外光谱和质子核磁共振谱。用X射线衍射方法测定了配合物的晶体结构,该晶体属于单斜晶系,P2_1/n空间群,a=0.9700(2)nm,b=1.5966(2)nm,c=1.9085(1)nm,β=104.71(3)°,V=2.8588(50)nm~3。配合物中镧为9配位,其配位多面体为扭曲的单帽四方反棱柱体。

过渡金属卡宾在环丙烷合成中的应用

过渡金属卡宾由于其特殊的结构,活泼,短寿命,特别是它们在 C—C 键形成中高度的选择性,已经成为一类有用的合成试剂和反应中间体。目前,过渡金属卡宾正广泛地应用于环丙烷及其衍生物的合成。本文主要介绍过渡金属卡宾的合成以及与烯烃的环丙烷化反应。

A METHOD OF FITTING TO MOSSBAUER SPECTRUM OF EU-151 AND ITS APPLICATION TO EUROPIUM COMPOUNDS

A method of fitting to Mossbauer spectrum of 151Eu has been proposed. The intensities and the positions of all the possible transitions between the sublevels of the ground state and those of the excited state of nucleus with spin I> 3/2 can be considered at one time in fitting to experimental Mossbauer spectra by this method. The method has been used to fit to the experimental Mossbauer spectra of europium orthophosphate crystal and of europium pentaphosphate crystal, and to derive Mossbauer parameters from...

钙钛石型催化剂La_(1-x)Sr_xFeO_(3-λ)的高分辨电子显微镜研究

钙钛石型复合氧化物的缺陷性质与其催化性能密切相关。在以前的报告中,作者用XRD、TG、Mssbauer谱等技术,研究了La_(1-x)Sr_xFeO_(3-λ)体系催化剂的晶体结构和缺陷性质以及它们与该体系催化剂在氨氧化反应中催化性能之间的关系,提出了在氧缺陷浓度较大的钙钛石中可能产生氧空位有序排列的结构.本文通过对上述体

Production and application of filaments of Grateloupia turuturu (Halymeniaceae, Rhodophyta)

Filaments from Grateloupia turuturu were obtained through germination of spores, regeneration from fragments of discoid crusts and erect thalli. The rates of filament formation through the three ways were 5.3 +/- 1.2%, 100%, and 62.3 +/- 5.6%, respectively. Discoid crusts were the best materials for the production of filaments. The obtained filaments were cloned in stationary and aerated culture. The differentiations of filaments were observed. When attached to the substrata, filaments differentiated into discoid crusts from which erect thalli grew, whereas for filaments in suspension culture, some cells in the filaments differentiated into spherical structures that also formed new erect thalli. Moreover, fragments of filaments (< 100 mu m) were seeded onto nori-nets. The regenerated plantlets grew into adult thalli in field cultivation.

Authigenic sulfide minerals and their sulfur isotopes in sediments of the northern continental slope of the South China Sea and their implications for methane flux and gas hydrate formation

This is a report of the study of the authigenic sulfide minerals and their sulfur isotopes in a sediment core (NH-1) collected on the northern continental slope of the South China Sea, where other geophysical and geochemical evidence seems to suggest gas hydrate formation in the sediments. The study has led to the findings: (1) the pyrite content in sediments was relatively high and its grain size relatively large compared with that in normal pelagic or hemipelagic sediments; (2) the shallowest depth of the acid volatile sulfide (AVS) content maximum was at 437.5 cm (> 2 mu mol/g), which was deeper than that of the authigenic pyrite content maximum (at 141.5-380.5 cm); (3) delta S-34 of authigenic pyrite was positive (maximum: +15 parts per thousand) at depth interval of 250-380 cm; (4) the positive delta S-34 coincided with pyrite enrichment. Compared with the results obtained from the Black Sea sediments by Jorgensen and coworkers, these observations indicated that at the NH-1 site, the depth of the sulfate-methane interface (SMI) would be or once was at about 437.5-547.5 cm and the relatively shallow SMI depth suggested high upward methane fluxes. This was in good agreement with the results obtained from pore water sulfate gradients and core head-space methane concentrations in sediment cores collected in the area. All available evidence suggested that methane gas hydrate formation may exist or may have existed in the underlying sediments.