  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, whose structure was characteristic of inorganic
spin-Peierls materials. 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.
