Reaction of P3N3Cl5NH2 with seleninylchloride in CH2Cl2 gives two ore-bridged compounds (P3N3Cl4NH2)(2)O and (P3N3Cl4NSeCl2)(2)O. Their stuctures have been solved by X-ray analysis. Reaction of P3N3Cl5NH2 With selentetrachloride leads to oil-like product probably P3N3Cl5NSeNCl5N3P3.