Supramolecular Assemblies from Poly(phenylacetylene)s

Freire, Félix; Quiñoá, Emilio; Riguera, Ricardo

doi:10.1021/acs.chemrev.5b00280

Cited by 249 publications

(213 citation statements)

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“…In addition, the monolayer must be deposited on an appropriate substrate, because the interactions between the solid support and the polymer can affect, not only to the intermolecular assembly of the polymer chains, but also to its helical conformation. 47,48 During the last decade several procedures have been developed to create well-ordered monolayers of PPAs and good quality AFM images.…”

Section: Introductionmentioning

confidence: 99%

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

2017

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This is the peer reviewed version of the following article: Freire, F. Quiñoá, E.; Riguera, R.; "Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study" Chemical Communications, 2017, 53, 481-492 PPAs by atomic-force microscopy (AFM) are presented, with special attention to the methods for the preparation of monolayers, and their consequences in the quality of the AFM images. Thus, monolayers formed by drop casting, spin coating followed by crystallization or annealing, Langmuir-Blodgett and Langmuir-Schaefer methods, onto highly oriented pyrolytic graphite (HOPG) or mica are described, together with the AFM images and the resulting helical structure obtained for different PPAs. Also, some conclusions are assessed both on the adequacy of the different techniques for the formation of monolayers and on the solid supports employed to elucidate the secondary structure of different PPAs.

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Section: Introductionmentioning

confidence: 99%

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

2017

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“…Apart from usual chiral 3 (non-helical) polymers, chirally helical polymers [27][28][29][30] have also been used for forming optically active polymer particles. 31 So far optically active particles have been successfully employed in diverse chiral-related research areas.…”

Section: Introductionmentioning

confidence: 99%

Optically Active Particles with Tunable Morphology: Prepared by Embedding Graphene Oxide/Fe₃O₄ in Helical Polyacetylene

Deng

2016

ACS Appl. Mater. Interfaces

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We report a novel and straightforward methodology for constructing hybrid particles with tunable morphology (spherical vs nonspherical) by embedding inorganic components (graphene oxide and/or Fe3O4 nanoparticles) inside chiral helical polyacetylene. Scanning electron microscopic images ascertain the spherical or nonspherical morphology of the particles. The intense circular dichroism effects demonstrate that the hybrid particles (spherical, ellipsoid-like, and cake-like) possess remarkable optical activity. The use of the chiral magnetic hybrid particles in enantioselective crystallization of racemic phenylalanine demonstrates the kind of particles' significant potential applications in chiral technologies and chiral processes. The study not only creates an unprecedented type of chiral hybrid particles, but also provides a versatile strategy for preparing advanced functional hybrid particles with tunable morphology from polymers and even from inorganic and metallic materials.

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confidence: 99%

“…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.…”

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confidence: 99%

“…[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.…”

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confidence: 99%

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

et al. 2019

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An ew multi-sensor material based on helical copolymers showing the chiral conflict effect have been prepared. It can successfully detect and identify diverse metal cations in solution. The design of this material has taken into account not only the opposite helical senses induced by the two chiral monomers in the copolymer,b ut also their dynamic behavior.T he induced helical sense can thus be enhanced, diminished, or inverted by interaction with different stimuli (that is,m etal ions). 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.The helical structures of dynamic polymers,s uch as poly-(phenylacetylene)s (PPAs), are usually stabilized by supramolecular interactions between monomer repeating units along the polymer chains,w ith steric effects also playing arole. [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. [14,15] Thus,c hiral amplification, helical enhancement, or helix inversion can be induced by the action of appropriate external stimuli. [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. [16][17][18][19][20][21][22][23][24][25][26][27][28] In such acase,the presence of asmall amount of the chiral monomer (minor component, sergeant) commands the secondary structure of the whole copolymer chain, that is,e ither M or P helices,b yi nducing ac ertain spatial orientation in the achiral units (major component, soldier). Recently,our group extended the concept of the sergeants and soldiers effect to am ore complex situation of PPAc opolymers;s pecifically, bipolymers,that is,c opolymers derived from two monomers, in which the two components are chiral. [16,17] In this way,one of them acts as ac hiral sergeant, while the other acts as ac hiral soldier.H ence,w hile the helical sense of the copolymer (that is,i ts M or P helicity) is commanded by the absolute configuration of the sergeant (minor component), the chirality at the periphery of the helix depends on the intrinsic chirality of the soldier (major component).Those studies showed that this chiral-to-chiral communication phenomenon, which is operative along ac opolymer chain and responsible of the enhancement of asingle-handed helicity,w...

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Supramolecular Assemblies from Poly(phenylacetylene)s

Cited by 249 publications

References 165 publications

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

Optically Active Particles with Tunable Morphology: Prepared by Embedding Graphene Oxide/Fe₃O₄ in Helical Polyacetylene

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

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Supramolecular Assemblies from Poly(phenylacetylene)s

Cited by 249 publications

References 165 publications

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study

Optically Active Particles with Tunable Morphology: Prepared by Embedding Graphene Oxide/Fe3O4 in Helical Polyacetylene

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

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Optically Active Particles with Tunable Morphology: Prepared by Embedding Graphene Oxide/Fe₃O₄ in Helical Polyacetylene