摘要
本文报道具有表面活性的探针——2-氯-N-十二烷基吡啶盐碘化物(CDPI)的疏水碳氢链在几种包结体(胶束、包结在环糊精(β-CD)中以及包结在甲基直链淀粉(MA))中的~1H核磁弛豫时间.通过比较CDPI中碳氢链的CH_3、(CH_2)_9的T_1及T_1(CH_3)/T_1(CH_2)_9的变化,发现CDPI的运动自由度按下列次序降低:游离态、包结在β-CD中、胶束状态、包结在MA中.顺磁离子Mn^(2+)对CDPI内各种质子的T_1的影响随其所处之包结体不同而变化.在胶束和甲基直链淀粉体系中,烷链的T_1几乎均不受Mn^(2+)的影响,说明水合Mn^(2+)不能进入CDPI胶束或甲基直链淀粉的螺旋内穴.
This paper reports the ~1H relaxation times of alkyl chain of the title compound in different aggregates——monomer, micelle, inclusion complexes with β-cyclodextrin (β-CD) and methyl amylose (MA). A comparison of T_1(CH_3), T_1(CH_2)_9 and T_1(CH_3)/T_1(CH_2)_9 among these aggregates reveal the dynamic behaviours of the chain and the motional freedom lowered down with the order: monomer, inclusion complex with β-CD, micelle, inclusion complex with MA. Mn^(2+) was used as a paramagnetic probe for observing its effeot on relaxation time so as to study whether penetration of water into these agg regates happened. The result indicates that. CDPI molecules were secreted into the hydrophobic core of micelle or in the helical cavity of amylose and prevent from penetration of water then shielded from paramagnetic effect of Mn^(2+).
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1991年第1期70-73,共4页
Acta Chimica Sinica
基金
国家自然科学基金会资助的项目
