(CH3NH3)3Sb2Cl9 single crystals are grown which appear to be isomorphous with Cs3Sb2Cl9 crystals of β-modification. They are characterized by the space group Pmcn with the lattice constants: a = 0.7920(5), b = 1.3334(11), and c = 1.966(2) nm. In the crystal one can distinguish the poly-anionic (Sb2Cl9)3- stacks directed along the a-axis with three crystallographically inequivalent CH3NH cations. The DSC, dielectric, and PMR studies reveal a structural phase transition at 208 K which is related to a freezing of rotational motion of CH3NH cations.
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Jakubas et al. (1986) studied this question.
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