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The room temperature structure with  P 2 1 / c  symmetry of the zinc(II) complex of pyridine-2,6-dicarboxylic acid was published by Okabe and Oya (N. Okabe, N. Oya, Copper(II) and zinc(II) complexes of pyridine-2,6-dicarboxylic acid.  Acta Crystallogr. C .  2000 ,  56 , 305). Here we report crystal structure of the low temperature phase  β -[Zn(pydcH) 2 ]·3H 2 O, pydc=C 7 H 3 NO 4 , resulting from the phase transition around 200K. The diffraction pattern of the low temperature phase revealed satellite reflections, which could be indexed with q-vector 0.4051(10)b* corresponding to (3+1) D  incommensurately modulated structure. The modulated structure was solved in the superspace group  X 2 1 / c (0 b 0) s 0, where  X  stands for a non-standard centring vector (½, 0, 0, ½), and compared with the room temperature phase. It is shown that hydrogen bonds are the main driving force of modulation.

The role of hydrogen bonds in order-disorder transition of a new incommensurate low temperature phase β -[Zn-(C 7 H 4 NO 4 ) 2 ]·3H 2 O