Supramolecular aggregation in dithia-arsoles: chlorides, cations and N-centred paddlewheels

Abstract

The benzo-fused dithia-chloro-arsole derivative C₆H₄S₂AsCl (1) is found to crystallise in the triclinic space group P with 17 molecules in the asymmetric unit whereas the tolyl derivative, MeC₆H₃S₂AsCl (2) is polymorphic with the α-phase crystallising in the monoclinic space group P2₁/c with a single molecule in the asymmetric unit and the β-phase adopting a triclinic structure with two molecules in the asymmetric unit. Reaction of these dithia-chloro-arsole derivatives with LiN(SiMe₃)₂ in a 3 : 1 mole ratio afforded the unique paddlewheel structure (MeC₆H₄S₂As)₃N (4).