A New Trend in Phenalenyl Chemistry: A Persistent Neutral Radical, 2,5,8-Tri-tert-butyl-1,3-diazaphenalenyl, and the Excited Triplet State of the Gablesyn-Dimer in the Crystal of Column Motif

Abstract

Stable gable radical: 1,3-Diazaphenalenyl radical, a typical example of an isoelectronic mode of modification for phenalenyl, has been isolated for the first time as a crystalline solid by introducing bulky substituents (see picture, tert-butyl groups are omitted from the crystal structure). The gable syn dimer with a column motif shows an extremely strong antiferromagnetic exchange coupling of 2J/kB=−4.19(2)×103 K.