The (1,3,4-trimethylpyridinium)2CuCl4 structure occurs in the polar Fdd2 space group while the Br salt is in centrosymmetric P21/c (Acta Cryst. 2009  , C65, m279). A size effect is confirmed with MCl42- salts found in polar Fdd2 when M = Co, Ni, Zn but in centrosymmetric C2/c when M = Mn, Cd.  The SO42- salt, which occurs as a trihydrate, and the I- salt are also centrosymmetric.  Salts with larger alkyl groups in the 1-position are under investigation.

Effect of anion size on space group polarity in 1-alkyl, 3,4-dimethylpyridinium salts

243rd National Meeting (2012)

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