Abstract
Resonance Raman spectra of (SNI y ) x crystals have been measured at 150 K. The energies of the principal Raman lines of the chromophore (109 and 154 cm −1) and their intensity behaviour with exciting laser frequency are consistent with the formation of a charge-transfer complex in which iodine enters the interfiber regions of the (SN) x lattice as I 5 - or I 3 - linked to distorted I 2 units. This structural model is supported by comparison of these Raman data with the excitation profiles of the chromophoric group in starch-iodine and α-cyclodextrine-iodine complexes. Possible mechanisms for the conductivity increase on the basis of the proposed charge transfer model are also discussed.
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