Abstract: | Synthesis and Crystal Structures of (PPh4)2As2Se4Cl12] and (PPh4)2As2Se4Br12] The reaction of PPh4Cl and As2Se3 with SOCl2 or with chlorine in dichloromethane affords (PPh4)2As2Se4Cl12] with good yields. From PPh4Br, As2Se3 and bromine the corresponding bromo compound was obtained. According to the X-ray crystal structure determinations both compounds are isotypic, crystallizing in the space group of P1 . In the anions two Se2X2 molecules are linked with two X? ions forming an Se4X2 ring in chair conformation. Each X?-ion is associated with an additional AsX3 molecule (X = Cl, Br). |