An 129I Mössbauer spectroscopic study of iodine doped in poly(vinylpyridines)

Publisher Website
Google Scholar
Abstract
The charge densities and the configurations of iodine doped in poly(2‐ and 4‐vinylpyridines) have been studied by using the Mössbauer effect of 129I at 16 K. The ’’outer complex’’ is first formed in the system of poly(2‐vinylpyridine) and iodine. The extent of the charge transfer is estimated to be 0.22 in the outer complex, which is nearly the same as pure pyridine. The iodine of the outer complex varies gradually to the tri‐iodide anion and then to the iodide anion by accepting electrons from the pyridine ring of the polymer. In the system of poly(4‐vinylpyridine) and iodine both the outer complex and the ’’inner complex’’ are first observed, and the iodine species in these complexes vary gradually to the I3− ion and finally to the I− ion in a similar manner as the system of poly(2‐vinylpyridine) and iodine. From the values of the Mössbauer parameters the charge or electron populations of the iodine species are calculated, and the arrangements of these species are discussed.