A systematic search over cationic clusters N(XE)4+ (X = B-Tl, E = O-Po) uncovers eight new planar-tetracoordinate-nitrogen species: N©(AlPo)4+, N©(GaE)4+ (E = Se-Po) and N©(InE)4+ (E = S-Po). High-level calculations confirm closed-shell minima, while magnetic criteria show only local diatropicity, ruling out global σ/π aromaticity.
Sacanamboy et al. (Thu,) studied this question.