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Twofold C−H Activation Enables Synthesis of a Diazacoronene‐Type Fluorophore with Near Infrared Emission Through Isosteric Replacement
Author(s) -
Greßies Steffen,
Ito Masato,
Sakai Mika,
Osaki Hiroshi,
Kim Ju Hyun,
Gensch Tobias,
Daniliuc Constantin,
Ando Naoki,
Yamaguchi Shigehiro,
Glorius Frank
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004080
Subject(s) - chemistry , amide , solvatochromism , coronene , adduct , aromaticity , fluorophore , rhodium , fluorescence , photochemistry , isoindole , lewis acids and bases , stokes shift , catalysis , crystallography , stereochemistry , molecule , organic chemistry , physics , quantum mechanics
The synthesis and photophysical properties of a soluble amide‐embedded coronene is reported. The key step in this synthesis is the twofold C−H activation of diazaperylene by a rhodium(III)Cp* catalyst. This unprecedented structural motif shows intense fluorescence in the near infrared region with a small Stokes shift and a distinct vibronic structure, which exhibits a slight extent of negative solvatochromism. Comparison of this compound with some relevant compounds revealed the importance of the amide incorporation in the peripheral concave region including an angular position to retain high aromaticity reflecting that of parent coronene. Treatment of this compound with Lewis acid B(C 6 F 5 ) 3 formed a bis‐adduct, which exhibited enhanced aromaticity as a consequence of the increased double bond character of the amide C−N bonds.