苯甲亚氨酸乙酯及N—乙氧基羰基亚甲基苯甲亚氨酯乙酯的~1H和~(13)C NMR的研究

本文测定了苯甲亚氨酸乙酯(Ⅰ)和N-乙氧基羰基亚甲基苯甲亚氨酸乙酯(Ⅱ)的~1H和~(13)C NMR谱,归属了共振谱线,得到了这两类化合物的官能团在苯衍生物中的经验增量,讨论了化学位移与Hammett常数的相关性.     

3（或）4—取代苯甲亚氨酸酯中取代基效应的^13C—NMR研究

本文测定了三个3(或4)-取代苯甲亚氨酸乙酯(1)和八个N-氰甲基-3(或4)-取代苯甲亚氨酸乙酯(2)的~(13)C-NMR谱。归属了1 和2和各碳化学位移。求得了的取代基化学位移(substituent Chemical Shift,SCS)。碳-13化学位移与单取代苯的取代基化学位移(SCS)的相关分析表明:4-取代苯甲亚氨酸酯1 b～g和2b～e中,除C_(2,6)外,其他各芳碳的化学位移值与加和规则基本相符;3-取代苯甲亚氨酸酯1h～j和2f～h中,除C_1外,其他各芳碳的化学位移值与加和规则基本相符。另外,本文还进行了碳-13化学位移与σ_(I)/σ_(R)~O和F/M的双参数相关分析。     

D,L-苯丙氨酸乙酯氯亚铂酸盐的晶体结构

在SYNTEX四圆衍射仪上收集到2788个独立的衍射点。晶体属单斜晶系,空间群为C_2h⁵-P2₁/a,a=12.006(2)?,b=8.398(2)?,c=14.261(5)?,β=93.98(2)°,Z=2。铂放在对称中心的特殊位置上,然后用差值Fourier法得到两套非氢原子坐标位置,这是由于铂参数特殊化所致。首先我们运用结构化学的键长、键角知识,选择了两个氯原子合理的坐标参数,而将其余成对的非氢原子坐标参数都输入,令其坐标参数固定,而将占有率各给0.5,并同各向同性热参数一起参与最小二乘修正,结果两套坐标的原子占有率明显分化,其中一套占有率上升接近于1,而另一套占有率下降,通过这一筛选,确定了结构的初始模型,用块矩阵最小二乘法修正,最后的R因子为0.038。结构测定表明铂采用dsp²杂化轨道成键,取四配位的正方形构型。在晶体中有机部分和[PtCl₄]^2-络离子是靠氮原子和氯原子之间形成氢键而联系起来的,因此此化合物是苯丙氨酸乙酯和四氯合铂离子的加合物。 关键词：     

绿原酸乙酯的NMR研究

从西南忍冬中分离得到了绿原酸乙酯，该化合物系首次从该属植物中获得。我们应用＾１Ｈ ＮＭＲ、＾１３Ｃ－ＮＭＲ、ＨＳＱＣ、ＨＭＢＣ等核磁共振技术明确归属了其碳信号及氢信号，并订正了文献中对部分信号的错误归属。     

一步法合成酞酸乙酯

合成钛酸乙酯的方法过去均采用两步合成法,它的生产周期长,劳动强度大。在学习兄弟厂先进经验的基础上,大胆试验,现在掌握了一步法合成钛酸乙醣的工艺。产品质量符合部颁标准WJ411—65的要求。(一) 反应原理钛酸乙酯,是由四氯化钛与乙醇直接作用而成。用于光学零件镀双层增透膜。     

Schiff碱水杨醛苯甲酰腙的特性

研究了 Schiff碱水杨醛苯甲酰腙 (简称 SBH)晶体在 DMSO及其 DMSO- H2 O的混合溶剂中的红外光谱 ,通过 SBH氘代前后的 IR对比发现 ,羟基氢质子与混合溶剂 DMSO- H2 O(3∶ 1 ,V/ V)产生较大的相互作用。向溶有 SBH的 75 % DMSO- 2 5 % H2 O的溶液滴加 KOH发现 ,SBH分子上的 C O羰基基团先与 KOH作用 ,其后与 O H 羟基基团作用     

Optical Potential Parameters for Halo Nucleus System ^6He＋^12C from Transfer Reaction ^11B（^7Li, ^6He）^12C

The optical potential parameters for the halo nucleus system ^6He＋^12C are extracted from fits to the measured angular distributions of ^11B（^7Li, ^6He）12C reaction at energies of 18.3 and 28.3MeV with distorted-wave Born approximation analysis. The characters of the obtained optical potentiM parameters are basically consistent with the results extracted from the fits to the elastic-scattering angular distributions in the literature.     

Mechanism of Proton-Induced Reactions on Targets ^16O, ^27Al, ^56Fe, ^112Cd, ^184W and ^208Pb At Ep = 800 MeV

We investigate the 800 MeV proton-induced spallation reactions on various targets by the improved quantum molecular dynamics （ImQMD05） model incorporated with a statistical decay model （SDM）. The influence of the nucleon-nucleon effective interaction on proton induced spallation reactions is studied by using different Skyrme interactions. It is found that the low energy part of the neutron double differential cross sections （DDCS）, which is mainly contributed from the decay of the excited residue, is influenced by the effective nucleon-nucleon interaction strongly., while the high energy part of neutron DDCS is influenced weakly. Among the Skyrme interactions used in the calculations, the calculation results with SkP give the best agreement with the experimental data.     

共轭亚油酸及其乙酯的颜色探究

采用HP－8452A二极管阵列分光光度计，测定了共轭亚油酸、共轭亚油酸乙酯、α－亚麻酸、α－亚麻酸乙酯在紫外和可见区的吸光度，绘制了样品在紫外区和可见区的吸收谱图，从物理光学透明体颜色形成原理的角度，对比了最大吸光度值和最大吸收波长的位置；减压蒸馏出了无色的共轭亚油酸和共轭亚油酸乙酯，从而得出结论：共轭亚油酸及其乙酯应当是没有颜色的。     

高比度同位素^192Ir和^60Co辐照的计算

利用反应堆物理的方法，对使用高通量堆辐照生产高比度同位素＾１９２Ｉｒ和＾６０Ｃｏ的方案进行了计算。从同位素产量和对堆物理参数的影响两方面分析了计算结果，提出了一个方案作为实际生产的参考。     

^27Al＋^27Al耗散产物反应时间的提取

用发展了的Ericson统计理论,从27Al＋27Al碰撞的耗散产物的激发函数提取了反应的相互作用时间约4．3×10-21s．     

NaS分子4^2П→3^2Σ^＋跃迁光辐射特性的理论研究

应用“反射方法”计算了ＮａＳ分子４＾２П→３＾２Σ＾＋跃迁几率密度的分布，对其相应跃迁的自发辐射、粒子数反转、受激辐射等问题进行了理论上的探讨。     

Alpha-decay branching ratios to high-lying excited-states of the ^242Cm → ^238Pu → ^234U → ^230Th → ^226Rn decay chain

We present a systematic calculation on the α-decay branching ratios to excited-states of an even-even α-decay chain ^242Cm → ^238Pu → ^234U → ^230Th → ^226Rn by the improved barrier penetration approach. The changes of the parities between the parent nuclei and the daughter nuclei are properly taken into account. The theoretical values are compared with the available experimental data and the deviation between them is within a factor of 5 in most cases.     

^5He Emission in Neutron-Induced ^10B Reactions

In n ＋^10B reactions, ^5He cluster emission has been discussed with the updated level scheme and the new optical model parameters. In this paper the reaction channels related to ^5He emission are listed in detail. By using the new reaction model for light nuclei, the double-differential cross sections of total outgoing neutrons for n ＋ ^10 B reactions at En= 14.2 MeV have been calculated, and the results agree fairly well with the measurements. Particularly, in the energy-angular spectra the contribution from the 5He-emission to the total outgoing neutron double-differential cross sections has also been analyzed, and the partial energy-angular spectra of 60° at En= 14.2 MeV have been given. The calculated results indicate that once the 5He emission is taken into account, the fitting with the double-differential measurements of total outgoing neutrons at the low energy region could be improved. Therefore, to consider the ^5He emission properly in the reaction processes of light nuclei is necessary.