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Updated: May 25, 2025

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Optical Waveguiding Charge-Transfer Cocrystals: Examining the Impact of Molecular Rotations on Their
Armando Navarro-Huerta1, Takumi Matsuo2, Alexander S Mikherdov3
1Instituto de Química, Universidad Nacional Autónoma de México, Coyoacán, Mexico City 04510, Mexico.
Abstract:
Here, we present the first example of a binary optical waveguiding (OWG) cocrystal with large anisotropy featuring a fluorinated acceptor molecule (CPP-TFPN, 1) with on-plane rotational dynamics, confirmed by solid-state NMR (19F T1) and theoretical calculations. Spatially resolved microphotoluminescence and variable-temperature photoluminescence experiments allowed us to examine the OWG performance and photophysical properties of both single crystals and bulk microcrystalline samples. A comparison with an analogous cocrystal containing a regioisomeric acceptor (CPP-TFTN, 2) revealed that the photoluminescence characteristics of 1 are associated with the rotational motions of the acceptor, offering insights into how the molecular motion changes this property.
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