The characterization of photoinduced chirality in a liquid-crystalline azo polymer on irradiation with circularly polarized light

Article Abstract:

An achiral liquid-crystalline azo polymer is irradiated with circularly polarized light, and the transmitted polarization data show evidence of photoinduced chirality. Two models are designed to interpret this result, one based on a uniaxial arrangement with the observed circular anistotropy included on a phenomenological level; the other based on a helical arrangement of chromophores. It was noticed that during the irradiation, the sense of the circular anisotropy switches.

Polymers, Chirality, Photochemistry

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Understanding the population, coordination, and orientation of water species contributing to the nonlinear optical spectroscopy of the vapor-water interface through molecular dynamics simulations

Article Abstract:

Molecular dynamics simulations are used to deconvolve the vibrational spectral features of the vapor-water interface based on molecular environment. Results reveal that surface water molecules that possess one proton donor bond and one proton acceptor bond make the dominant contribution to both the SSP- and SPS-polarized spectral responses and are located within an angstrom of the Gibbs dividing surface.

Water, Molecular dynamics, Protons

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Anomalous cis isomer orientation in a liquid crystalline azo polymer on irradiation with linearly-polarized light

Article Abstract:

An experiment is conducted wherein the azo-containing liquid crystalline polymer is radiated with linearly polarized blue Ar(super +) light. The results obtained indicate that the dichroic visible spectra show evidence for two bands of opposite sign in the region of the nPi transition that are attributed to the trans and cis isomers.

Polymer liquid crystals, Liquid crystalline polymers, Spectra, Isomerism, Isomers (Chemistry)

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