Light‐Driven Supramolecular Chirality in Propeller‐Like Hydrogen‐Bonded Complexes That Show Columnar Mesomorphism

Vera, Francisco; Tejedor, Rosa M.; Romero, Pilar; Barberá, Joaquín; Ros, M. Blanca; Serrano, José Luís; Sierra, Teresa

doi:10.1002/anie.200603796

Cited by 115 publications

(74 citation statements)

References 40 publications

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“…[109][110][111] Supramolecular assemblies J-aggregates in PVA/aqueous solution were dried as a film and mounted between optical glass plates 112 : CD spectra were collected rotating the sample around the optical axis and about the vertical axis. More recently Yao et al 113 revisited the same topics in solution phase detecting different conformers according to the apparent CD measurements.…”

Section: Filmsmentioning

confidence: 99%

Experimental aspects of solid state circular dichroism

2009

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Section: Filmsmentioning

confidence: 99%

Experimental aspects of solid state circular dichroism

2009

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“…[15] Sierra et al reported columnar mesomorphic assembles of propeller-like hydrogen-bonded complexes with azobenzene units which show a chiral photoresponse upon irradiation with CPL. [16] Nikolova et al detected the photoinduction of a large circular birefringence and circular dichroism (CD) in films of a side-chain azobenzene liquid crystalline polyester by illumination with CPL. [17] Similar effects have been observed in amorphous polymers, but in these cases pre-orientation was required.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Chiral Nematic Organization in an Achiral Glassy Nematic Azopolymer

Tejedor

Oriol

Serrano

et al. 2007

Adv Funct Materials

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A liquid crystalline homopolymer that has photoisomerizable methoxyazobenzene groups in the side chain has been synthesized and characterized. Thin films of the nematic glassy phase of this polymer have been processed in order to study the absorption spectra and the vibrational and electronic circular dichroism responses by irradiation with 488 nm circularly polarized light (CPL). Selective reflection of visible light demonstrates that the irradiation of this glassy nematic azopolymer induces a helix as a consequence of the chiral arrangement of the azobenzene units. Moreover, a wedge cell with an aligning layer for planar orientation was filled with the polymer with the aim of investigating the change in the macroscopic optical properties and optical textures of the azopolymer on irradiation with CPL. The transfer of chirality from CPL to azopolymer through chiral conformations is proposed as a model for explaining the supramolecular chirality.

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“…According to their explanation, the photoinduced chirality upon irradiation with circularly polarized light can be attributed to the lack of equilibrium balance between left-and right-twisted conformations of the azobenzene molecule, which occurs because of the momentum transfer from the light to the molecule. Sierra and coworkers reported that chirality switching can be also induced in a hydrogen bonded complex system that exhibits a columnar liquid crystalline phase [182]. Their system consists of nonmesomeric V-shaped azobenzene arms and melamine derivative core.…”

Section: Chirality Switching and Amplificationmentioning

confidence: 99%

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

2012

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Photocontrol of molecular alignment is an exceptionally-intelligent and useful strategy. It enables us to control optical coefficients, peripheral molecular alignments, surface relief structure, and actuation of substances by means of photoirradiation. Azobenzene-containing polymers and functionalized liquid crystalline polymers are well-known photocontrollable materials. In this paper, we introduce recent applications of these materials in the fields of mechanics, self-organized structuring, mass transport, optics, and photonics. The concepts in each application are explained based on the mechanisms of photocontrol. The interesting natures of the photocontrollable materials and the conceptual applications will stimulate novel ideas for future research and development in this field.

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Light‐Driven Supramolecular Chirality in Propeller‐Like Hydrogen‐Bonded Complexes That Show Columnar Mesomorphism

Cited by 115 publications

References 40 publications

Experimental aspects of solid state circular dichroism

Experimental aspects of solid state circular dichroism

Photoinduced Chiral Nematic Organization in an Achiral Glassy Nematic Azopolymer

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

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