Synthesis of metalla-dual-azulenes with fluoride ion recognition properties

Hai-Cheng Liu, Kaidong Ruan, Kexin Ma, Jiawei Fei, Yu-Mei Lin () and Haiping Xia ()
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Hai-Cheng Liu: Xiamen University
Kaidong Ruan: Xiamen University
Kexin Ma: Xiamen University
Jiawei Fei: Xiamen University
Yu-Mei Lin: Xiamen University
Haiping Xia: Xiamen University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Azulene-based conjugated systems are of great interests due to their unusual structures and photophysical properties. Incorporation of a transition metal into azulene skeleton presents an intriguing opportunity to combine the dπ-pπ and pπ-pπ conjugated properties. No such metallaazulene skeleton however has been reported to date. Here, we describe our development of an efficient [5 + 2] annulation reaction to rapid construction of a unique metal-containing [5-5-7] scaffold, termed metalla-dual-azulene (MDA), which includes a metallaazulene and a metal-free organic azulene intertwined by sharing the tropylium motif. The two azulene motifs in MDA exhibit distinct reactivities. The azulene motif readily undergoes nucleophilic addition, leading to N-, O- and S-substituted cycloheptanetrienyl species. Demetalation of the metallaazulene moiety occurs when it reacts with nBu4NF, which enables highly selective recognition of fluoride anion and a noticeable color change. The practical [5 + 2] annulation methodology, facile functional-group modification, high and selective fluoride detection make this new π-conjugated polycyclic system very suitable for potential applications in photoelectric and sensing materials.

Date: 2023
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DOI: 10.1038/s41467-023-41250-5

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