electron withdrawing group

In chapter 2 , we designed and synthesized two novel series of organic dyes by incorporating NC-CH2-COOH as electron withdrawing group at the carbonyl positions of QA skeleton .

在第二章中，我们通过在QA骨架的羰基位置引入吸电子基团NC-CH2-COOH设计并合成了两个系列新颖的有机染料。

The photodegradation experiment showed that the introduction of electron withdrawing group on methane chain would improve the photo-stability of the dye , while electron donating group would decrease the photo-stability .

三种染料与其母核染料的光降解对比试验说明，甲川链上引入吸电子基团使得染料光稳定性提高，而供电子基团则光稳定性下降。

Substitution of the aromatic hydrogen atom of the Schiff base ligand with electron withdrawing group decreased the amount of the complex encapsulated in the zeolite cavities , but could improve the catalytic activity of the encapsulated complex .

席夫碱芳环上的H被吸电子基团取代后，降低了Y分子筛超笼中封装的钴配合物的量，但能改善催化活性。

The macroporous , strongly acidic , high thermally stable canon exchange resin catalysts were synthesized in the steps of polymerization of styrene and divinylbenzene , purifying copolymer , introducing electron withdrawing group , sulfonation and stabilizing active sites .

通过苯乙烯与二乙烯苯聚合、共聚物纯化、引入吸电子基团、磺化、活性基因稳定化过程，合成耐温强酸阳离子交换树脂催化剂。

The [ ( 4-fluoro phenyl ) methoxy ] acetic acid derivatives ( 5 ~ 9 ) were prepared in order to compare electron withdrawing group F with Cl , Br and I in substituted ( phenyl methoxy ) acetates the effects of tor learning and memory facilitation in mice .

为研究吸电子基-氟，对苯甲氧基乙酸酯类小鼠学习记忆促进作用的影响，合成了（4-氟苯甲氧基）乙酸衍生物（5～9）。