Stimuli-Responsive Polyacetylenes and Dendronized Poly(phenylacetylene)s

Abstract

Combination of stimuli responsiveness with p-conjugated polymers possesses probabilities not only to provide these polymers with unique interesting properties but also to promote new functions including various optoelectronic properties, catalysis, ionic sensing, and chiral recognition. In the former part of this review, recent developments of stimuli-responsive polyacetylenes are surveyed, which act as receptors towards external stimuli such as solvent, temperature, pH, chiral compounds, metal cations, various anions, electricity, light, etc., to transduce to other signals or energies, which leads to a wide range of intriguing properties to mimic biological processes or applications to smart or intelligent materials. In the latter part, we introduce dendronized poly(phenylacetylene)s (PPAs) exhibiting interesting thermoresponsive and chiroptical properties. Thermoresponsiveness of these dendronized conjugated polymers shows synchronous influence on their helical and hydrated conformations.

From self‐assembled peptide‐ynes to peptide polyacetylenes and polydiacetylenes

“…In this work, we focused our attention on the chemical polymerizations of triple‐bond functionalized peptides that can produce colored (optical absorption above 380 nm) polymers with repeated peptide units joined together by conjugated double or alternating double–triple bonds . As a result, such peptide‐based polyacetylenes (PAs) or polydiacetylenes (PdAs) are expected to be electronically active and may be good candidates for the preparation of novel materials.…”

Chiral Conflict as a Method to Create Stimuli‐Responsive Materials Based on Dynamic Helical Polymers

“…[1][2][3][4][5][6][7][8][9][10] Controlled conformational changes at the pendant groups modulate these supramolecular and/or steric interactions, resulting in variations on the helical structure of the polymer, that is,e longation [11][12][13] and/or helical sense. It can successfully detect and identify diverse metal cations in solution.…”

“…It can successfully detect and identify diverse metal cations in solution. [1][2][3][4][5][6][7][8][9][10] In the case of copolymers formed by the combination of chiral and achiral monomers,t he modulation of the helical structure may occur through ac onformational communication mechanism (going from the chiral to the achiral pendants) that originates ac hiral amplification phenomenon denoted as the sergeants and soldiers effect. Thus,d epending on both the copolymer compositions (such as monomer ratios and absolute configurations) and the nature of the metal ion, the response of these dynamic helical copolymers to adopt as ingle-handed PorM helix is unique,m aking it possible not only to detect their presence,b ut also to identify them individually.N ew multisensors materials based and inspired on this effect should arise in the future choosing appropriate monomers and stimuli.…”

“…[1][2][3][4][5][6][7][8][9][10] Controlled conformational changes at the pendant groups modulate these supramolecular and/or steric interactions, resulting in variations on the helical structure of the polymer, that is,e longation [11][12][13] and/or helical sense. [1][2][3][4][5][6][7][8][9][10] Controlled conformational changes at the pendant groups modulate these supramolecular and/or steric interactions, resulting in variations on the helical structure of the polymer, that is,e longation [11][12][13] and/or helical sense.…”

“…[1][2][3][4][5][6][7][8][9][10] Controlled conformational changes at the pendant groups modulate these supramolecular and/or steric interactions, resulting in variations on the helical structure of the polymer, that is,e longation [11][12][13] and/or helical sense. [1][2][3][4][5][6][7][8][9][10] In the case of copolymers formed by the combination of chiral and achiral monomers,t he modulation of the helical structure may occur through ac onformational communication mechanism (going from the chiral to the achiral pendants) that originates ac hiral amplification phenomenon denoted as the sergeants and soldiers effect. [1][2][3][4][5][6][7][8][9][10] In the case of copolymers formed by the combination of chiral and achiral monomers,t he modulation of the helical structure may occur through ac onformational communication mechanism (going from the chiral to the achiral pendants) that originates ac hiral amplification phenomenon denoted as the sergeants and soldiers effect.…”