| Summary: | Using modified solvothermal conditions (longer cooling time), beside previously characterized dark-green crystals of [Ni(C4H2O4)(C12H8N2)] (main product), a few light-green crystals of the polymeric title compound, catena-poly[[aqua(1,10-phenanthroline-κ2N,N′)nickel(II)]-μ-fumarato-κ2O:O′-[aqua(1,10-phenanthroline-κ2N,N′)nickel(II)]-μ-fumarato-κ4O,O′:O′′,O′′′], [Ni(C4H2O4)(C12H8N2)(H2O)]n were isolated. Its crystal structure is made up from zigzag chains, propagating in [001], in which the Ni2+ ions are linked alternatively by μ2-fumarato and bis-chelating fumarato bridging ligands. The Ni2+ ion is coordinated in a deformed octahedral geometry by one chelating 1,10-phenanthroline ligand, one aqua ligand in a cis position with regard to both N-donor atoms and by two different fumarato ligands, each residing with its central C=C bond on an inversion centre, occupying the remaining coordination sites in a fac fashion. The chains thus formed are linked by O—H...O hydrogen bonds and π–π interactions between the aromatic rings of the phenanthroline ligands with a shortest ring centroid separation of 3.4787 (10) Å.
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