THE EFFECT OF OXYGEN ON THE INCORPORATION OF MANGANESE,IRON AND COBALT INTO HEMATOPORPHYRIN IX IN GLACIAL ACETIC ACID

Abstract

The results of polarography studies for the reaction of hematoporphyrin IX with Mn(II), Fe(II) and Co(II) ion in acetic acid in the absence and the presence of oxygen are reported. The metal incorporation reaction in the presence of oxygen is quantitative for Mn and Co and incomplete for Fe. In the absence of oxygen, the Mn reaction does not proceed at all, whereas, both the Fe and Co reactions are quantitative.     

交联烯丙基葡聚精凝胶固定化脂肪酸的研究

本文研究了烯丙基葡聚糖和N、N＇－亚甲基双丙烯酰胺经反相悬浮聚合包埋固定化脂肪酶的方法。考察了悬浮介质、交联度对固定化酶的影响，得出了包埋固定化脂肪酶的最佳条件；并测定了固定化脂肪酶的催化性能，确定了该固定化酶催化橄榄油水解的最适条件。     

THE EFFECTS OF MOLECULAR STRUCTURE ON PARAMETERS a, b AND c IN RETENTION EQUATION AND PREDICTION OF CAPACITY FACTORS IN RP-HPLC

In this paper, the effects of molecular structure on the parameters a, b and c in retention equation are investigated theoretically and experimentally. Parameter b in RP-HPLC approaches a small constant, because there is very weak displacement adsorption. Parameter c in RP-HPLC is mainly determined by the difference between solute-strong solvent and solute-weak solvent interaction and can be quantitatively correlated with the structural parameters of solute such as van der Waals volume (Vw), dipole moment (μA) and hydrogen bond energy (XAH). Parameter a has similar rules to parameter c. The prediction of k' value for non-polar, homologous compounds is studied. The linear relationship between k' and coverage of amount of the bonded chain in RP-HPLC is confirmed.     

π-烯丙基稀土配合物的合成、结构及其催化烯烃聚合反应机理的研究——Ⅱ.LiY(π-C_3H_5)_4·2.5D催化异戊二烯聚合反应机理的研究

<正> 在稀土配位共轭双烯烃聚合反应机理的研究中,一般认为按π-烯丙基机理进行,但迄今为止尚缺乏足够的实验证据。我们曾用~1H-NMR、一维~(13)C-NMR和二维~(13)C-NMR系统地研究了(CF_3COO)_2LnCl·EtoH-(i-Bu)_2AIH-共轭双烯烃(Ln=La、Pr、Nd、Sm、Tb、Ho、Sc和Y)均相聚合体系的聚合机理,提出了η~4-共轭双烯(顺式-反式-)和η~3-烯丙基(同式-对式-)机理。但由于广烯丙基稀土配合物稳定性差,难于合成,加之聚合体系中很难直接分离出π-烯丙基稀土配合物活性体,为此,至今尚未能用模型π-烯丙基稀土配合物对上述机理进行研究。我们已合成一系列π-烯丙基稀土配合物LiLn