Optical Waveguiding Charge-Transfer Cocrystals: Examining the Impact of Molecular Rotations on Their Photoluminescence
Armando Navarro‐Huerta, Takumi Matsuo, Alexander S. Mikherdov, Jan Blahut, Erika Bartůňková, Pingyu Jiang, Martin Dračínský, Simon J. Teat, Mingoo Jin, Shotaro Hayashi, Braulio Rodríguez‐Molina
Abstract
High Resolution Image Download MS PowerPoint Slide 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 ( 19 F T 1 ) 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.