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- W4361205902 abstract "Quinoidal molecules based on dipyrrolyldiketone boron complexes (QPBs), in which pyrrole units were connected by a partially conjugated system as a singlet spin coupler, were synthesized. QPB, which was stabilized by the introduction of a benzo unit at the pyrrole β-positions, formed a closed-shell tautomer conformation that showed near-infrared absorption. The deprotonated species, monoanion QPB– and dianion QPB2–, showing over 1000 nm absorption, were formed by the addition of bases, providing ion pairs in combination with countercations. Diradical properties were observed in QPB2–, whose hyperfine coupling constants were modulated by ion-pairing with π-electronic and aliphatic cations, demonstrating cation-dependent diradical properties. VT NMR and ESR along with a theoretical study revealed that the singlet diradical was more stable than the triplet diradical." @default.
- W4361205902 created "2023-03-31" @default.
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- W4361205902 date "2023-03-28" @default.
- W4361205902 modified "2023-10-17" @default.
- W4361205902 title "Deprotonation-Induced and Ion-Pairing-Modulated Diradical Properties of Partially Conjugated Pyrrole–Quinone Conjunction" @default.
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- W4361205902 doi "https://doi.org/10.1021/jacs.3c01025" @default.
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