1992 年 61 巻 7 号 p. 2522-2533
Iodine-doped polyvinyl-alcohol(PVA) films were studied at 16 K using the Mössbauer resonance of 129I. Experiments were done for the PVA films with or without boric acid, stretched or not, and doped with iodine only or co-doped with iodine and bromine. For the iodine-doped PVA films without boric acid, a major iodine species is I−. The addition of boric acid causes the formation of linear polyiodides with symmetrical charge population, I3− and I5−, and the stretch of the films increases the abundance ratio of I5−. From the analysis of the intensity ratio of the quadrupole split lines, it was confirmed that the linear polyiodides, I3− and I5−, lie parallel to the stretching direction. For iodine and bromine co-doped stretched films with boric acid iodine exists as the central ion in the form of linear IBr2−.
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