| Autor: |
Zhou, QiZhong, Jiang, HuaJiang, Ding, Liang, Wang, Feng, Wu, Tao |
| Zdroj: |
SCIENCE CHINA Chemistry; May2010, Vol. 53 Issue 5, p1081-1088, 8p |
| Abstrakt: |
Bis(crown ether) homoditopic monomers containing two bis( p-phenylene)-34-crown-10 moieties with different angles (180° for monomer 3, 120° for monomer 4, and 60° for monomer 5) and a complementary bisparaquat homoditopic monomer ( 7) were designed and synthesized. The three bis(crown ether) monomers could organize into linear supramolecular polymers in concentrated solutions in CHCl3/CH3CN with the bisparaquat monomer 7, as demonstrated by 1H NMR and viscosity studies. The pseudorotaxanes or supramolecular polymers formed from 3+ 7 and 4+ 7 had larger values of Ka, p, n, slope 1, and slope 2 than those of 5+ 7. This result was attributed to the greater steric hindrance of compound 5 than that of 3 and 4, which resulted in less effective formation of linear supramolecular polymers from 5 with compound 7 than those from compounds 3 and 4 with compound 7, as also demonstrated by UV-vis method. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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