Abstract:Bond homolysis (BHo) is a fundamental concept in chemical‐bonding phenomena. To date, research studies on the BHo concept have provided crucial information for understanding the nature of chemical bonding and reactions. Two potential‐energy minima, a σ‐bonding isomer and a singlet‐diradical isomer, have been known to exist in carbon–carbon BHo. In the present study, a third isomer, that is, a puckered singlet diradical exhibiting unstructured long‐wavelength fluorescence beyond 460 nm, was first observed in th… Show more
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