Abstract
Upon oxidation of 5.10-dihydro-5.10-diethylphenazine (E 2P) with iodine golden-green lustrous crystals of a compound with stoichiometry E 2P.I 1.6 were isolated. The compound crystallizes in the tetragonal space group D 4 2 with a = 12.321(2) A ̊ and c = 5.330(2) A ̊ . The E 2P and I form interpenetrating incommensurate sublattices along c, with an iodine repeat distance of 9.7 Å. Static susceptibility measurements at room temperature give χ g = + 0.994 × 10 −6 g −1 × cm 3. This corresponds to one unpaired electron spin per two formular units. Single-crystal EPR indicates that the paramagnetism is associated with weakly interacting E 2P + cation radicals. The 300K-d.c. conductivity of 3×10 −2Ω −1cm −1 and activation energy of 0.17±0.02eV for single crystals is consequently associated with the polyiodide chains, and not with the E 2P + cation radicals.
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