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Communication | Special issue | Vol 95, No. 2, 2017, pp.730-737
Published online, 14th December, 2016
DOI: 10.3987/COM-16-S(S)64
Kinetic Switching of Achirality/Chirality Memorization of meta-Ethynylpyridine Polymer by Coordination of Cu(II) Outside the Polymer

Hajime Abe,* Shunsuke Takashima, and Masahiko Inouye*

*Graduate School of Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan

Abstract

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 β-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 β-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 β-L-glucopyranoside causing very slow decay of the CD band.