substituent

A novel substituent descriptor based on the 17 different physicochemical parameters about the electronic, hydrophobic and steric properties of substituents is used to describe the chemical structures of 22 cyclic ureas and 22 N, N-dimethyl-2-bromo ( substituted phenyl) ethylamine derivatives, respectively.

把取代基电性、立体及疏水性物化参数组合建立一种新取代基描述方法，对环尿素类和N，N-二甲基-2-溴苯乙胺类衍生物进行结构表征。

The conjugation between the isolated electron pair at N atom in CCN group and the π electrons on the aniline ring framework& n-π conjugation, and the electronic effect of the substituent in p-position of aniline ring are very subordinate factors.

CCN基团上N的孤电子对与苯胺环π电子的共轭nπ共轭，以及苯胺环对位上取代基的电子效应是很次要的因素。

In order to improve the hole mobility of PT and lower the HOMO and broaden the absorption spectrum, a novel conjugated polymer, poly ( thienylene-vinylene-thienylene) with cyano substituent ( CN-PTVT) was synthesized.

为进一步有效地提高聚噻吩的空穴迁移率、降低聚合物的HOMO能级以及拓宽聚合物的吸收光谱，设计合成了一种新型的腈基取代的聚（噻吩-乙烯-噻吩）的聚合物CN-PTVT。