1987 Volume 60 Issue 3 Pages 857-861
Resonance Raman and 129I Mössbauer spectroscopy have been applied to the phenothiazine–iodine (PT–In) complexes, which exhibit relatively low electrical resistivities. It is shown from the resonance Raman spectra that the two iodine species in the PT–I3 and PT–I2.6 complexes are present in essentially the same chemical form, consisting of a distorted I3− unit and an I2 unit strongly coordinated to the I3− unit. The 129I Mössbauer spectrum, consistent with the results of the Raman spectra, suggests that the PT–I2.6 complex can be approximately formulated as (PT)53+[(I3)3(I2)2]3−, in which about three electrons per five PT molecules are transferred to the iodine and the transferred electrons are delocalized on the thirteen iodine atoms. The radical salt is recognized as a partially oxidized mixed-valence compound. The formation of the complex is quite similar to that of the perylene–I3 complex, which has a low electrical resistivity.
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