Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.314
Publication date: 18th July 2023
Ortho-fused aromatic rings form helically shaped chiral molecules such as carbo[6]helicenes, that wind in a left-handed (M) or a right-handed (P) sense.[1-3] The helical topology combined with extended pi-conjugation provides helicenes with peculiar properties such as strong photophysical and chiroptical properties (high optical rotation values, intense electronic circular dichroism - CD, and circularly polarized emission - CPL). The molecular engineering of helicenes using organometallic and heteroaromatic chemistries offers a convenient way to tune the properties of these helically shaped ligands. Indeed, their combination with metallic or organic assembling units leads to chiral materials with appealing properties (circularly polarized phosphorescence, magnetochirality, spin selectivity). Applications in materials science (Circularly Polarized OLEDs, Chiroptical Switches, Spintronics) are targetd. A set of representative examples will be presented while emphasizing the specific features of each system. When possible, theoretical calculations enable to shed light on the phenomena (exciton coupling chirality, singlet or triplet excited state features, molecular orbitals involvement, dissymmetry factors improvement, ...).[4-6]
Financial support from the French National Research Agency (ANR) (iChiralight, ANR-19-CE07-0040 and SMMCPL, ANR-19-CE29-0012-02) and the European Commission Research Executive Agency (Grant Agreement number: 859752 − HEL4CHIROLED − H2020-MSCA-ITN-2019).
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