Helicity Induction in a Poly(4-carboxyphenyl isocyanide) with Chiral Amines and Memory of the Macromolecular Helicity in Aqueous Solution
Helicity Induction in a Poly(4-carboxyphenyl isocyanide) with Chiral Amines and Memory of the Macromolecular Helicity in Aqueous Solution
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DOI：
10.1021/ma0611873
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发表时间：
2006-08
期刊：
影响因子：
5.5
通讯作者：
Y. Hase;M. Ishikawa;R. Muraki;and Katsuhiro Maeda;E. Yashima
中科院分区：
文献类型：
--
作者：
Y. Hase;M. Ishikawa;R. Muraki;and Katsuhiro Maeda;E. Yashima
聚（4-羧基苯基异腈）（poly-1-H）及其钠盐（poly-1-Na）在二甲基亚砜（DMSO）和水中分别与手性胺络合后，在亚氨基发色团的n−π* 过渡区显示出诱导圆二色性（ICD），这是由于聚合物普遍形成单手螺旋。在水中诱导的聚-1-钠的螺旋结构在完全去除手性胺后可以进一步记忆。我们现在报告，聚-1-钠也形成了诱导的螺旋结构，并表现出类似的ICD中存在的光学活性的季铵盐，各种手性胺，和L-氨基酸在水中。Poly-1-H不溶于水，但在手性胺的存在下变得可溶，并且复合物也显示出类似的ICD。研究了不同含水量有机溶液对离子传导器件的影响以及诱导大分子螺旋度的记忆性。
Poly(4-carboxyphenyl isocyanide) (poly-1-H) and its sodium salt (poly-1-Na) show an induced circular dichroism (ICD) in the n−π* transition region of the imino chromophores upon complexation with chiral amines in dimethyl sulfoxide (DMSO) and water, respectively, due to the prevailing one-handed helix formation of the polymers. The helical structure of poly-1-Na induced in water can be further memorized after complete removal of the chiral amines. We now report that poly-1-Na also forms an induced helical structure and exhibits a similar ICD in the presence of an optically active quaternary ammonium salt, various chiral amines, and l-amino acids in water. Poly-1-H was insoluble in water, but became soluble in the presence of chiral amines, and the complexes also showed similar ICDs. The effects of the water content in various aqueous organic solutions on the ICDs and the memory of the induced macromolecular helicity were also investigated.