Nitrogen analogues of Chichibabin's and Müller's hydrocarbons with small singlet-triplet energy gaps

Chem Commun (Camb). 2019 Jul 2;55(54):7812-7815. doi: 10.1039/c9cc02725d.

Abstract

Nitrogen analogues of Chichibabin's and Müller's hydrocarbons, DPh-D and TPh-D, based on 1,2,4-benzotriazinyl (Blatter) were studied. The two diradicaloids with good chemical and thermal stability exhibit smaller singlet-triplet energy gaps (ΔES-T from -1.05 to -1.27 kcal mol-1) than the hydrocarbon diradicaloids with the same bridges.