The title mononuclear complex, [Ni(C(5)H(2)N(2)O(4))(C(3)H(4)N(2))(2)(H(2)O)(2)] or [Ni(HOr)(im)(2)(H(2)O)(2)] (im is imidazole and H(3)Or is orotic acid, or 2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid), has been synthesized and the crystal structure determination is reported. The Ni(II) ion in the complex has a distorted octahedral coordination geometry comprised of one deprotonated pyrimidine N atom and the adjacent carboxylate O atom of the orotate ligand, two tertiary imidazole N atoms and two aqua ligands. An extensive three-dimensional network of OW-H...O and N-H...O hydrogen bonds, and pi-pi and pi-ring interactions are responsible for crystal stabilization.

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@article{Uar2004merDiaquabis1HimidazolekappaN3orotatok, title={mer-Diaquabis(1H-imidazole-kappaN3)(orotato-kappa2N3,O4nickel(II).}, author={Ibrahim Uçar and Ahmet Bulut and Okan Zafer Yeşilel and Halis Olmez and Orhan B{\"{u}y{\"{u}kg{\"{u}ng{\"{o}r}, journal={Acta crystallographica. Section C, Crystal structure communications}, year={2004}, volume={60 Pt 11}, pages={m563-6} }