Spectroscopic evidence for selenium iodides in carbon disulfide solution: Se3I2, Se2I2, and SeI2

Analysis of selenium solubility in solutions of iodine in carbon disulfide shows that selenium iodides are formed, according to the equilibrium nSe+I 2 =SenI 2 . Selenium-77 NMR spectra of these solutions exhibit 4 principal peaks, which are assigned to Se 3 I 2 (α-Se and β-Se), Se 2 I 2 , and SeI 2 , as supported by their concentration dependence, chemical shifts, and half-height line widths. The main selenium iodide formed is Se 2 I 2 .