We have studied the crystal structure and magnetic properties of the organic radical cation salt, BBDTA.InCl4. This material formed a one-dimensional coordination polymer. Magnetic measurements indicated the spin-Peierls transition-like behavior at 108 K, which was higher than those typically observed for the other organic spin-Peierls materials. The structural aspects of the lattice distortion from X-ray diffraction measurements at 50 K have been discussed.
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