Abstract
A series of ortho fluoro-tolane liquid crystals was prepared via multi-step reactions based on 4-alkylcyclohexanecarboxylic acids. Their synthetic routes, thermotropic mesophases and UV stability properties are discussed by comparision with the non-fluorinated analogs. All of the measurements from DSC, UV-vis absorption and fluorescence emission spectra demonstrate that the presence of ortho fluorine can significantly improve the UV stability of tolane-liquid crystals. Meanwhile, the ultimate failure mechanism of tolane-LCs during UV exposure is deduced by a photochemical reaction. DFT calculations of molecular polarizabilities, triple bond lengths, electrostatic potential maps and molecular orbitals are used to correlate the experimental findings. The interaction mechanism for stabilization of the tolane structures by the ortho fluoro substitution is also explained. This work may provide an effective solution for the obstacle existed in tolane-liquid crystals and pave a way for their applications in liquid crystal photonics.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
