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|Title:||Phenalenyl-fused porphyrins with different ground states||Authors:||Zeng W.
Polycyclic aromatic hydrocarbons
|Issue Date:||2015||Publisher:||Royal Society of Chemistry||Citation:||Zeng W., Lee S., Son M., Ishida M., Furukawa K., Hu P., Sun Z., Kim D., Wu J. (2015). Phenalenyl-fused porphyrins with different ground states. Chemical Science 6 (4) : 2427-2433. ScholarBank@NUS Repository. https://doi.org/10.1039/c4sc03866e||Abstract:||Materials based on biradicals/biradicaloids have potential applications for organic electronics, photonics and spintronics. In this work, we demonstrated that hybridization of porphyrin and polycyclic aromatic hydrocarbon could lead to a new type of stable biradicals/biradicaloids with tunable ground state and physical property. Mono- and bis-phenalenyl fused porphyrins 1 and 2 were synthesized via an intramolecular Friedel-Crafts alkylation-followed-by oxidative dehydrogenation strategy. Our detailed experimental and theoretical studies revealed that 1 has a closed-shell structure with a small biradical character (y = 0.06 by DFT calculation) in the ground state, while 2 exists as a persistent triplet biradical at room temperature under inert atmosphere. Compound 1 underwent hydrogen abstraction from solvent during the crystal growing process while compound 2 was easily oxidized in air to give two dioxo-porphyrin isomers 11a/11b, which can be correlated to their unique biradical character and spin distribution. The physical properties of 1 and 2, their dihydro/tetrahydro-precursors 7/10, and the dioxo-compounds 11a/11b were investigated and compared. © 2015 The Royal Society of Chemistry.||Source Title:||Chemical Science||URI:||https://scholarbank.nus.edu.sg/handle/10635/175512||ISSN:||20416520||DOI:||10.1039/c4sc03866e|
|Appears in Collections:||Staff Publications|
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