咪唑配位的夹心型锑钨多氧酸盐Na9[{Na(H2O)2}3{M(C3H4N2)}3(SbW9O33)2]·xH2O (M= NiII, CoII, ZnII, MnII)

在pH≈7.5的水溶液中，Na₂WO₄·2H₂O,SbCl₃·6H₂O, 咪唑与 NiCl₂·6H₂O (或MnSO₄·H₂O,Co(NO₃)₂·6H₂O, ZnSO₄·7H2O)反应得到了四种咪唑配位的夹心型锑钨多氧酸盐Na₉[{Na(H₂O)₂}₃{M(C₃H₄N₂)}₃(SbW₉O₃₃)₂]·xH₂O(M=NiII, x = 32, CoII, x = 32,ZnII, x = 33, MnII, x = 34)。用X射线单晶衍射法确定了Na₉[{Na(H₂O)₂}₃{Ni(C₃H₄N₂)}₃(SbW₉O₃₃)₂]·32H₂O的结构,聚阴离子{Na(H₂O)₂}₃{Ni(C₃H₄N₂)}₃(SbW₉O₃₃)₂]₉-具有近似C_3v对称性，3个咪唑环垂直于中心带上六个金属离子(Na-Ni-Na-Ni-Na-Ni)所形成的平面。晶体结构中相邻的阴离子间存在着π-π相互作用，相邻咪唑的二面角为60º。用IR, UV-vis, TG 和DSC,对这些化合物的性质进行了表征，推测了它们的热分解过程。     

HORMONAL REGULATION OF CALLUS FORMATION IN RELATION TO NUCLEIC ACIDS AND AMINO ACIDS METABOLISM

The cotyledon segments of mung bean were cultured On Miller's medium with or without auxins and cytokinins. It was found that NAA and kinetiu were both required for callus formation and the growth rate increased proportionally to their concentrations. RNA and protein synthesis increased in the early stage of callus formation and the increase of the total RNA was mainly due to the increase of 25S and 18S RNA. In addition, it has been shown that the total amount of free amino acids in the control segments obviously increased after incubation and was larger than that in the callus-forming segments. On the other hand, the amount of protein amino acids in the callus-forming segments was larger than that in the control. Both proline and hydroxyproline existed in the control and callus-forming segments were increased, but the ratio of hydroxyprolinc and proline in the callus-forming segments was tfigher than that in the control.     

阴离子表面活性剂缔合乙基硫堇光度法测定硫化物的研究

研究了二乙氨基对苯胺与硫化物形成乙基硫堇的显色反应,十二烷基磺酸钠可提高测定S2-的灵敏度。该缔合物在675nm处有最大吸收,摩尔吸光系数为4.25×104L·mol-1·cm-1,S2-测定的线性范围为0～0.8μg/mL。该方法用于天然水中微量硫化物的测定,结果满意。     

STUDIES ON PAN MACROMOLECULAR SEMICONDUCTING FIBER 1. PREPARATION OF PAN CONDUCTING FIBER TREATED BY STANNIC CHLORIDE AND ITS SEMICONDUCTING BEHAVIOUR

The PAN fiber treated by Lewis acid (e.g. stannic chloride) could be transformed into a macromolecular conducting fiber by further thermal treatment. Depending on thermal treatment condition the resistance of the fiber varied from 10~3 to 10~(12) Ωand kept stable after hydrolysis. The fiber has enough strength to be processed by various means. This is a new kind of macromolecular semiconducting fiber having some characteristics similar to those of organic semiconductors.     

SO_4~(2-)/Ce-TiO_2光催化降解二甲基二氯乙烯基磷酸酯

以钛酸四丁酯 (Ti(OBu) 4 )、Ce(NO3 ) 3 、H2 SO4为主要原料 ,采用溶胶 凝胶法制备了SO2 -4/Ce TiO2 光催化剂 ,用XRD、IR、BET、XPS、TG DTA等测定技术对所制得的试样进行了表征 ,并将其用于光催化降解二甲基二氯乙烯基磷酸酯的稀释液。结果表明 ,SO2 -4/Ce TiO2 中TiO2 以锐钛矿晶型存在 ,并且具有超强酸特征 ,当n(Ce) /n(TiO2 ) =0 0 0 5 ,c(H2 SO4) =0 5mol/L时 ,焙烧温度为 5 0 0℃是最佳制备条件 ,其光催化降解性能较Ce TiO2 有明显提高。     

一锅法合成11-氨基十一酸的研究

探索了一锅法合成11－氨基十一酸的方法，与分步合成法相比，一锅法具有操作简便、反应条件温和、无需分离中间体、产率较高等特点。并讨论了温度、反应时间、氨比等对一锅法合成产率的影响。     

析相液—液萃取法

析相液—液萃取法是基于胶束水溶液中的析相(Phase Separation)法,国内外已有不少研究报告发表,本文就此题作论述,以了解其发展的概貌及趋向。 析相液—液萃取法有形成凝聚体的析相法和“浊点”析相法两种。 1 形成凝聚体的析相法 形成凝聚体的作用,发生于某些物质的离子在带电荷的表面活性剂(如季铵盐阳离子)或其它物质的水溶液。开始时,这种物质的离子与胶束聚合成业微观的晶簇,接着聚合成显微滴,再进一步凝聚。这些显微滴能以富含表面活性剂的连续相析出,因此,形成两个明显的相。当再加入适当电解质时,富含表面活性剂的相能沉淀或絮凝析出。除了阳离子和阴离子表面活性剂外,蛋白质、高聚物和微乳液也有形成凝聚体的行为。Dubin等根据表面电荷的不同,用来分离血红蛋白质,较详细研究了牛血清蛋白或核糖核酸酶与阳     

激光作用下血红蛋白的荧光

一、引言应用激光光解研究生物大分子的光解动力学过程,已做了不少工作.但对激光作用下蛋白质分子的非线性光学现象,还研究的不多.我们应用自己设计安装的激光实验装置,以血红蛋白和碳氧血红蛋白为对象,研究它们在激光作用下的光解离和双光子过程、荧光随时间变化等现象.我们观察到,在激光作用下,碳氧血红蛋白和血红蛋白出现双光子过程和发短波长荧光,而在碳氧血红蛋白中出现“滞后”荧光现象.这些现象可对生物分子内部能级和能量转移过程等提供有益的信息.     

甲烷与H02反应的微观动力学研究

应用从头算方法和变分过渡态理论，在B3LYP／6—3ll G^**方法下和300～2000K温度范围内研究甲烷与HO2反应的微观动力学特性，得到由过渡态向反应物方向、向产物方向的能垒分别是11．83和l02．90kJ／mol。理论计算正向反应速率常数与实验值之比为1．08～2．85，用此方法还可以预测没有实验数据的温度点反应的速率常数。     

1-甲基-3-吲哚甲叉(异丙叉)琥珀酸酐(I)和1-甲基-3-吲哚乙叉(异丙叉)琥珀酸酐(II)的晶体结构

The crystal structures of the title compound (Ⅰ) and (Ⅱ) have been determined by X-ray diffraction. Crystal data are: C_(17)H_(15)NO_3(Ⅰ), triclinic, α=0.7308(2) nm, b=0.8845(3) nm, c=1.1323(3) nm, α=100.03(2)°, β=104.81(2)°, γ=97.20(2)°, V=0.6856(3) nm, Z=2, R=0.047 and C_(18)H_(17)NO_3(Ⅱ), monoclinic, a=1.1006(3) nm, b=1.1172(2) nm, c=1.4046(3) nm, β=102.78(2)°, V=1.5337(6) nm, Z=4, R=0.055. The molecular conformation is cis form for compound Ⅰ and trans form for compound(Ⅱ).