Control of the Helicity of Poly(phenylacetylene)s: From the Conformation of the Pendant to the Chirality of the Backbone
作者:Iria Louzao、José M. Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1002/anie.200905222
日期:2010.2.15
Helix sense selection: Tuning the conformational equilibrium of the pendants of poly(phenylacetylene)s allows selection of the helicity of the polymer in a reversible way. Complexation with appropriate metal cations (e.g. Ba2+) or changing the polarity of the solvent permits the reversible selection of the desired helix sense. A full picture of the mechanism explaining this phenomenon is presented
the MeOH ratio that is present as cosolvent, different coordination sites are involved leading to complexes I-III, each one with a characteristic structure (tri-, bi-, unipodal) and associated helical state. This dynamic coordination allows the selective modification of the helical sense or the stretching/compression backbone of a helical polymer.