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Title: | A bis-NHC–CAAC dimer derived dicationic diradical |
Authors: | Nayak, Mithilesh Kumar VIJAYAKANTH, THANGAVEL BOOMISHANKAR, RAMAMOORTHY et al. Dept. of Chemistry |
Keywords: | Chemistry 2022-OCT-WEEK3 TOC-OCT-2022 2022 |
Issue Date: | Nov-2022 |
Publisher: | Royal Society of Chemistry |
Citation: | Chemical Science, 13(42), 12533-12539. |
Abstract: | The isolation of carbon-centered diradicals is always challenging due to synthetic difficulties and their limited stability. Herein we report the synthesis of a trans-1,4-cyclohexylene bridged bis-NHC–CAAC dimer derived thermally stable dicationic diradical. The diradical character of this compound was confirmed by EPR spectroscopy. The variable temperature EPR study suggests the singlet state to be marginally more stable than the triplet state (2J = −5.5 cm−1 (ΔEST = 0.065 kJ mol−1)). The presence of the trans-1,4-cyclohexylene bridge is instrumental for the successful isolation of this dicationic diradical. Notably, in the case of ethylene or propylene bridged bis-NHC–CAAC dimers, the corresponding dicationic diradicals are transient and rearrange to hydrogen abstracted products. |
URI: | https://doi.org/10.1039/D2SC03937K http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/7431 |
ISSN: | 2041-6520 2041-6539 |
Appears in Collections: | JOURNAL ARTICLES |
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