Nitrogen analogues of Chichibabin's and Müller's hydrocarbons with small singlet–triplet energy gaps†
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.