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Pathway to Polyradicals: A Planar and Fully π-Conjugated Organic Tetraradical(oid)

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In this work, we provide a general strategy to stabilize the ground state of polyradical(oid)s and make higher spin states thermally accessible. As a proof of concept, we propose to merge two planar fully π-conjugated diradical(oid)s to obtain a planar and cross-conjugated tetraradical(oid). Using multireference quantum chemistry methods, we show that the designed tetraradical(oid) is stabilized by aromaticity and delozalization in the π-system and has six thermally accessible spin states within 1.72 kcal/mol. Analysis of the electronic structure of these six states of the tetraradical(oid) shows that its frontier π-system consists of two weakly interacting subsystems: aromatic cycles and four unpaired electrons. Conjugation between unpaired electrons, which favors closed-shell structures, is mitigated by delocalization and the aromaticity of the bridging groups, leading to the synergistic cross-coupling between two diradical(oid) subunits to stabilize the tetraradical(oid) electronic structure.

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Journal of Physical Chemistry Letters, 2024, vol. 15, p. 5243-5249

# metadata.dc.rights[].value
cc-by (c) Betkhoshvili, Sergi et al., 2024

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Articles publicats en revistes (Ciència dels Materials i Química Física)

# metadata.dc.title[].value
Pathway to Polyradicals: A Planar and Fully π-Conjugated Organic Tetraradical(oid)