Toward helical-shaped diradicaloids: cyclobutenyl o-quinodimethane-bridged indeno[1,2-b]fluorenes

Open-shell diradicaloids have been intensively investigated recently due to their attractive and unique optical, electronic and magnetic properties. However, open-shell diradicaloids with non-planar conjugated frameworks are less studied, especially helical-shaped pi systems. In this work, we synthe...

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Veröffentlicht in:Chemical communications (Cambridge, England) Jg. 54; H. 81; S. 11383 - 11386
Hauptverfasser: Qiu, Shuhai, Wang, Chaoqiang, Xie, Sheng, Huang, Xiaobo, Chen, Lanlan, Zhao, Yunhui, Zeng, Zebing
Format: Journal Article
Sprache:Englisch
Veröffentlicht: CAMBRIDGE Royal Soc Chemistry 09.10.2018
Schlagworte:
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
GROUND-STATE
CORANNULENE
RADICALS
CLOSED-SHELL
HYDROCARBON
EXTENDED P-QUINODIMETHANES
MOLECULES
ISSN:1359-7345, 1364-548X
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Zusammenfassung:Open-shell diradicaloids have been intensively investigated recently due to their attractive and unique optical, electronic and magnetic properties. However, open-shell diradicaloids with non-planar conjugated frameworks are less studied, especially helical-shaped pi systems. In this work, we synthesized tetraindeno-based singlet biradicals in a helical geometry, bridged by a curved cyclobutenyl o-quinodimethane molecule. Large diradical characters and extremely small singlet-triplet energy gaps, as well as unusual half-field transitions (forbidden Delta M-s = 2) were revealed for these 3D diradicals.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc05929b