Synthesis, structure, Raman, and ESR characterization of a new organic charge transfer salt, (BEDT-TTF)(sub 2)(N(SO(sub 2)CF(sub 3))(sub 2))

摘要

The new charge transfer salt (BEDT-TTF)(sub 2)(N(SO(sub 2)CF(sub 3))(sub 2)) was synthesized and structurally characterized. Its unit cell parameters at 295 K are: a = 6.6394(13) (angstrom), b = 8.658(2) (angstrom), c = 17.349(4) (angstrom), (alpha) = 94.70(2)(degree), (beta) = 97.21(2)(degree), (gamma) = 68.95(2)(degree), V = 922.7(4) (angstrom)(sup 3), space group P(bar 1), and Z = 1. The anion, N(SO(sub 2)CF(sub 3))(sub 2)(sup (minus)), was found to be disordered, which may relate to the absence of the (nu)(sub 4) and (nu)(sub 5) A(sub g) modes of the BEDT-TTF molecule in the Raman spectrum. ESR measurements reveal its semiconductive behavior with a small energy gap of 18.7 meV.