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DOI: 10.1039/A800014J (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 1327-1334

New metal-binding modes for 5-aminoorotic acid: preparation, characterization and crystal structures of zinc(II) complexes

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Nikolia Lalioti, Catherine P. Raptopoulou, Aris Terzis, Athanassios Panagiotopoulos, Spyros P. Perlepes and Evy Manessi-Zoupa

Abstract

Treatment of ZnCl2 with 2 equivalents of 5-aminoorotic acid (5-amino-2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid, H4L) and 2 equivalents of NaOH in water–methanol yielded a mixture of crystals and powder of complexes [{Zn(H2L)(H2O)2}n] 1 and [Zn(H3L)2(H2O)4] 2, respectively. A good yield (ca. 70%) of pure 2 can be obtained by the reaction of Zn(O2CMe)2·2H2O and 2 equivalents of H4L in refluxing water. The crystal structure of 1 consists of neutral octahedral [Zn(H2L)(H2O)2] units which form polymer chains along the b axis; H2L2– behaves as a bis(bidentate) bridging ligand co-ordinating to two zinc atoms via the amino nitrogen, the oxygen of the neutral carboxamide group, the deprotonated carboxamide nitrogen and one of the carboxylate oxygens and forming two five-membered chelate rings. The 1H NMR spectra of 1 in (CD3)2SO at 290 and 310 K suggest that its solid-state structure is not retained in solution. Slow crystallization of 1 or 2 from dmso solutions yielded crystals of the monomeric octahedral complex [Zn(H3L)2(dmso)2(H2O)2] 3 the structure of which was solved by single-crystal X-ray crystallography. The monoanion H3L– utilizes only one carboxylate oxygen for metal binding in the centrosymmetric complex 3. The difference in anionic charge and co-ordination mode between H2L2– and H3L– leads to different hydrogen-bonded supramolecular structures for 1 and 3. The IR and 1H NMR spectra of the prepared complexes are discussed.

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