Quinoidal Azaacenes: 99 % Diradical Character | Zendy

Intorp Sebastian N. | Zendy; Hodecker Manuel | Zendy; Müller Matthias | Zendy; Tverskoy Olena | Zendy; Rosenkranz Marco | Zendy; Dmitrieva Evgenia | Zendy; Popov Alexey A. | Zendy; Rominger Frank | Zendy; Freudenberg Jan | Zendy; Dreuw Andreas | Zendy; Bunz Uwe H. F. | Zendy

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Quinoidal Azaacenes: 99 % Diradical Character

Author(s) -

Intorp Sebastian N.,

Hodecker Manuel,

Müller Matthias,

Tverskoy Olena,

Rosenkranz Marco,

Dmitrieva Evgenia,

Popov Alexey A.,

Rominger Frank,

Freudenberg Jan,

Dreuw Andreas,

Bunz Uwe H. F.

Publication year - 2020

Publication title -

angewandte chemie international edition

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.831

H-Index - 550

eISSN - 1521-3773

pISSN - 1433-7851

DOI - 10.1002/anie.201915977

Subject(s) - diradical , character (mathematics) , electron paramagnetic resonance , paramagnetism , squid , spectroscopy , chemistry , solid state , crystallography , photochemistry , nuclear magnetic resonance , condensed matter physics , atomic physics , physics , quantum mechanics , singlet state , biology , mathematics , ecology , geometry , excited state

Quinoidal azaacenes with almost pure diradical character ( y= 0.95 to y= 0.99) were synthesized. All compounds exhibit paramagnetic behavior investigated by EPR and NMR spectroscopy, and SQUID measurements, revealing thermally populated triplet states with an extremely low‐energy gap Δ E ST′ of 0.58 to 1.0 kcal mol −1 . The species are persistent in solution (half‐life≈14–21 h) and in the solid state they are stable for weeks.

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