A Luminescent Stable Triarylmethyl Diradical with an Axially Chiral Spacer
Yohei Hattori1, Ryota Matsuoka2, Atsumi Baba3
1Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, 630-0192, Japan.
Abstract:
Two units of a highly stable luminescent triarylmethyl radical (PyBTM) were bridged using a chiral octahydrobinaphthyl moiety, resulting in a diradical with sufficient stability to enable the measurement of its chiroptical properties. To synthesize this diradical, a novel boronic ester radical precursor, αH-PyBTM-B(Epin), was designed. The use of this precursor significantly improved the yield and streamlined the preparation of stable luminescent radical-substituted molecules. The photoluminescence quantum yield (PLQY) of the diradical was measured to be 10 % in chloroform. Furthermore, both circular dichroism (CD) and circularly polarized luminescence (CPL) were successfully observed.
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