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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 1 H 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.
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 1 H 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.