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In the title complex, {[Zn(C 4 O 4 )(C 12 H 8 N 2 )(H 2 O)]·H 2 O}  n  , the penta­coordinated Zn II  ion is bound to two N atoms of the 1,10-phenanthroline ligand, two O atoms from two bridging acetyl­enedicarboxyl­ate anions and a water O atom in a distorted trigonal–bipyramidal geometry. The crystal structure is characterized by polymeric zigzag chains running parallel to [2-10] and is stabilized by O—H⋯O hydrogen bonds.

acta crystallographica. section e

catena-Poly[[[aqua(1,10-phenanthroline-κ2N,N′)zinc]-μ-acetylenedicarboxylato-κ2O1:O2] monohydrate]