The possibility of hypoiodite ion formation by the hydrolysis of iodine has been examined by experimental as well as theoretical studies. The aqueous solution of iodine shows absorbance maxima near 205 nm (most intense band), 285 nm (weaker band), and 355 nm (weakest). The band at 355 nm had previously been attributed to OI- ions. INDO CI calculations on OI- do not give an absorbance band near any of the above wavelengths. Also, our experimental observations suggest that OI- ions do not form in the aqueous solution. The theoretical calculations predict a H2OI2 complex in which two iodine atoms are arranged along the C2v axis of H2O and which has absorbance bands at 181 nm (most intense), 277 nm (weaker), and 365 nm (weakest). The shifts in wavelengths of maximum absorbance are explained in terms of solvation of the highly polar H2OI2 complex.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry