Photoinduced circular anisotropy in side-chain azobenzene polyesters

Nikolova, L.; Тодоров, Т.; Ivanov, M.; Andruzzi, F.; Hvilsted, Søren; Ramanujam, P. S.

doi:10.1016/s0925-3467(97)00046-3

Cited by 143 publications

(109 citation statements)

References 6 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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“…Supramolecular chirality has been generally induced by the self-assembly of homochiral molecules or a mixture of chiral and achiral molecules, where the molecular chirality is transferred (and amplified as well in case of the mixture) to the handedness of the self-assembled helical structure [12][13][14][15] . Only a few papers have described generation of supramolecular chirality by irradiation of azobenzene-containing achiral molecules with CPL, presumably through alignment of the azobenzene chromophores following the direction of CPL [16][17][18] .…”

mentioning

confidence: 99%

Induction and control of supramolecular chirality by light in self-assembled helical nanostructures

et al. 2015

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Evolution of supramolecular chirality from self-assembly of achiral compounds and control over its handedness is closely related to the evolution of life and development of supramolecular materials with desired handedness. Here we report a system where the entire process of induction, control and locking of supramolecular chirality can be manipulated by light. Combination of triphenylamine and diacetylene moieties in the molecular structure allows photoinduced self-assembly of the molecule into helical aggregates in a chlorinated solvent by visible light and covalent fixation of the aggregate via photopolymerization by ultraviolet light, respectively. By using visible circularly polarized light, the supramolecular chirality of the resulting aggregates is selectively and reversibly controlled by its rotational direction, and the desired supramolecular chirality can be arrested by irradiation with ultraviolet circularly polarized light. This methodology opens a route to ward the formation of supramolecular chiral conducting nanostructures from the self-assembly of achiral molecules.

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“…Photoinduced circular anisotropy in a polymer with azobenzene side-chains was first reported by Nikolova and coworkers in 1997 [187]. The degree of photoinduced circular anisotropy was evaluated using linearly polarized light by measuring the rotation of the polarization azimuth; a value of about 6° per 1-μm-thick film at a wavelength of 488 nm was reported.…”

Section: Supramolecular Chiralitymentioning

confidence: 96%

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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Photoinduced circular anisotropy in side-chain azobenzene polyesters

Cited by 143 publications

References 6 publications

Experimental aspects of solid state circular dichroism

Experimental aspects of solid state circular dichroism

Induction and control of supramolecular chirality by light in self-assembled helical nanostructures

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

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