KINETIC SWITCHING OF ACHIRALITY/CHIRALITY MEMORIZATION OF META-ETHYNYLPYRIDINE POLYMER BY COORDINATION OF Cu(II) OUTSIDE THE POLYMER

摘要

Memorization of achirality and chirality of meta-ethynylpyridine polymer with amino side chains was actualized by cross-linking with Cu(OTf)(2) as a precursor. When beta-D-glucopyranoside and Cu(OTf)(2) were added to the coordinative polymer in this order, a CD band was induced around 340 nm and enhanced by Cu(II)-coordination. On the other hand, in the case Cu(OTf)(2) and beta-D-glucopyranoside were added to the polymer in this order, only a weak CD band was induced because achirality was memorized before the addition of the glucoside. For the chiral helical complex with enhanced CD, a chiral memorization effect was assured by the addition of beta-L-glucopyranoside causing very slow decay of the CD band.