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The title complex, [Cd(C 6 H 2 N 2 O 4 )(H 2 O) 3 ]  n  , is a new monoclinic polymorph. The ortho­rhom­bic form has previously been reported [Ma  et al.  (2006  ▶ ).  Acta Cryst.  E 62 , m2528–m2529]. The Cd—N and Cd—O bond lengths range from 2.265 (3) to 2.333 (3) Å; a weak Cd—O inter­action is also present, the inter­atomic distance being 2.658 (4) Å. The Cd II  ions, which have a distorted penta­gonal-bipyramidal geometry, are bridged by pyrazine-2,3-dicarboxyl­ato ligands, forming a zigzag chain structure. The chains are connected by O—H⋯O hydrogen bonds into a three-dimensional framework.

A new polymorph ofcatena-poly[[triaquacadmium(II)]-μ2-pyrazine-2,3-dicarboxylato]

A new polymorph ofcatena-poly[[triaquacadmium(II)]-μ₂-pyrazine-2,3-dicarboxylato]