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Cover Picture: Nitrogen Analogues of o ‐Quinodimethane with Unexpected non‐Kekulé Diradical Character (Chin. J. Chem. 6/2018)
Author(s) -
Li Tao,
Cheng Cheng,
Yuan Ningning,
Wang Lei,
Chen Chao,
Tan Gengwen,
Wang Xinping
Publication year - 2018
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201880061
Subject(s) - diradical , chemistry , delocalized electron , cover (algebra) , character (mathematics) , singlet state , nitrogen , chin , electron delocalization , crystallography , stereochemistry , organic chemistry , atomic physics , geometry , physics , excited state , mechanical engineering , mathematics , engineering , medicine , anatomy
The cover picture shows para ‐Quinodimethane ( p ‐QDM) and ortho ‐quinodimethane ( o ‐QDM) are two typical examples of Kekulé‐type delocalized diradicals. The cover picture shows that the replacement of the carbinyl centers with isoelectronic aminium centers leads to the formation of isolable nitrogen analogues of o ‐QDM. In contrast to o ‐QDM, the nitrogen analogues exhibit unexpected non‐Kekulé diradical characters and features open‐shell singlet ground states with thermally accessible triplet states. More details are discussed in the article by wang et al. on page 487–490.