PS2Br and AsS2X (X = Br, I): similar molecules with completely different shapes – a combined experimental and theoretical study†
Abstract
By the reaction of solid As4S4 with gaseous Br2 at a temperature of 410 K gaseous AsSBr and AsS2Br are formed; the reaction with gaseous I2 at 468 K leads to the formation of AsSI, AsS2I, As2S2I2 and As2S3I2. Thermodynamic data on these novel species are obtained by S π-bonds are realized due to their strength over one S–S σ-bond. As2S3I2 contains a five-membered As2S3-ring with one S–S-bond. The ionization energies are determined and compared with those obtained from calculations; they serve as a further indication for the structures realized in these molecules.