Ting Chen, Shaoying Ju, Weili Yan, Jixi Lu, Yufen Zhao, Douglas W Stephan, Yile Wu
A series of α-diimine-supported, spiro-Al2E2-bridged diradicaloids (E = S, Se or NPh) were isolated from reactions of LAl(thf)Cl with S8, Se and LiNHPh, respectively. Each species features a ligand-centered, open-shell singlet diradical ground state with a small singlet-triplet energy gap.