离子对

The results of the reaction show that better regioselectivity is obtained when Cd2+ is used as additive and give stereoselective product when cinchonine is used as chiral additive.Keywords: NaBH4, Regioselective,Stereoselective,Benzoyl acetone,Metal ion

结果发现，不同的金属离子添加剂使反应出现不同的化学选择性，而Cd2+离子对苯甲酰丙酮的还原具有较好的化学选择性，同时在辛可宁存在条件下得到了对映体过量的产物。

The photodegradation of three phenols in different mediums was studied in the presence of divalent manganese ions.

通过对不同锰离子浓度下三种酚在三种不同介质中的光降解情况的研究，来确定水体中的锰离子对酚类有机物的光化学降解的影响。

It is interesting that (1)hyperconjugation of the solvent's CF3-donor group prefers H4/H5 of BMI cation to H2, which can be explained by the steric hindrance of PF6 anion;(2) the various-temperature 19F spin-lattice relaxation times (T1) of CF3 show phase change, e.g.

藉由分析阳离子和三氟乙醇的扩散速率求得DD值，可以看到改善在乙醇形成大的基团，产生较强的分解，三氟乙醇的性质利用19F、1H化学位移，得到(1)CF3和阳离子H4、H5形成超共轭大於对H2，因为立体效应的关系，而藉由19F迟缓时间的数据，三氟乙醇展现相变化，由一到两各堆叠的离子对，和一个阴离子形成超阴离子的情形，因为溶剂而开始崩解，在继续分解可得到自由的阴阳离子。

A reversed phase ion-pair high performance liquid chromatographic method was developed for the simultaneous determination of nicotine and cotinine in human hair.

以庚烷磺酸钠为离子对试剂，建立了同时测定头发中尼古丁和可天宁含量的反相离子对高效液相色谱方法。

The combination of ion-pair extraction technology with reversed-phase ion-pair chromatography method provide a effective inspection measure for the sulfonates in water.

样品的四丁基溴化铵和二氯甲烷离子对萃取方法与反相离子对色谱分离联用，为水体中芳香族磺酸盐的检测提供了可靠的监测手段。

Fluoride ions caused widespread endemic fluorosis in humans, but little attention was paid to the effect of fluoride ions on aquatic organisms. Semi-static acute toxicity trial on larval Siberian sturgeon Acipenser baeri was carried out to explore the safe criteria of fluoride to fish.

为检测氟对鱼类的生态毒性效应，在水温（17±1）℃的条件下，采用半静态式生物毒性试验方法研究了氟离子对西伯利亚鲟初孵仔鱼的急性毒性效应（氟离子浓度梯度设置为0、100、200、300、400、500、600mg·L-1）。

Function of Mg Ion in protecting and repairing lesioned cells induced by UVB was detected by detecting cell viability and yield of cyclobutane pyrimidine dimers.

通过观察镁离子对紫外线辐射损伤后细胞活性与光产物产量的影响，以明确镁离子对UVB辐射细胞损伤的防护作用。

The growth and development of Lupinus polyphyllus seeds with different ion at different dosage implanted were studied.

通过对羽扇豆种子注入不同种类和浓度的离子，研究了不同离子对羽扇豆当代生长发育的影响。

A thermal model of 2D FLAC is used to simulate the chloride ions diffusion in carbonized concrete and un-carbonized concrete, because they have the same control equation.

分析总结了混凝土中氯化物的来源和对混凝土的侵蚀机理以及氯离子侵蚀的模型，分析了氯离子对钢筋锈蚀的影响。

It can be concluded that the ion dopants have large influences on the phase transition temperature and particle size.

归纳分析了离子掺杂对二氧化钛由锐钛矿型向金红石型转化的抑制作用，得出不同掺杂离子对TiO2相转化温度和粒径具有较大影响的结论。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。