摘要
用紫外-可见光谱和电导方法考察了系列烷烃链端含偶氮苯基团的不对称季铵盐Gemini表面活性剂a4-6-n(n=12、14、16)与α-环糊精(α-CD)的相互作用。结果表明随着增加α-CD的浓度,它先与a4-6-n的烷烃链结合,再与偶氮苯基团结合。在足量α-CD存在下,a4-6-n与其主要形成1︰2型的稳定复合物。在紫外光激发下,偶氮苯基团由平面的反式结构变为弯曲的顺式结构,其分子构型与α-CD的空腔不再匹配。一部分复合物中的α-CD从偶氮苯基团上脱离,另一部分向上移动到靠近头基的较短烷烃链上,体系中由此形成了不同结构的超分子复合物。
The interactions between a newly synthesized dissymmetric quaternary ammonium Gemini sttrfactant （referred to as α4-6-n） and α-cyclodexlrin （α-CD） have been examined using UV-V is spectroscopy and conductivity methods. The results showed that α-CD was associated first with the alkyl chain of a4-6-n and then with the azobenzene group along with the increase of α-CD concentration. In the presence of enough α-CD molecules, α4-6-n and α-CD can be formed into stable 1：2 complexes. After UV light irradiation, the planar trans-azobenzene group was transformed to the twisted c/s-isomer. The geomelry of azobenzene group did not match the cavity of α-CD any more. For some of the complexes, α-CD dissociated from the azobenzene group, while for the remaining complexes, α-CD was driven to associate with the short alkyl chains near the head groups. As a result, the supramolecular complexes with different structures were formed in the system.
出处
《中国科技论文》
CAS
北大核心
2012年第12期929-934,共6页
China Sciencepaper
基金
国家自然科学基金资助项目(21203078)
中央高校基本科研业务费专项资金资助项目(JUSRP111A06)
