Abstract
The structures of the Li(I) and Na(I) salts of 2-thiobarbituric acid (2-sulfanylidene-1-3-diazinane-4,6-dione, H2TBA) have been studied. μ-Aqua-octaaquabis(μ-2-thiobarbiturato-κ(2)O:O')bis(2-thiobarbiturato-κO)tetralithium(I) dihydrate, [Li4(C4H3N2O2S)4(H2O)9]·2H2O, (I), crystallizes with four symmetry-independent four-coordinated Li(I) cations and four independent HTBA(-) anions. The structure contains two structurally non-equivalent Li(I) cations and two non-equivalent HTBA(-) anions (bridging and terminal). Eight of the coordinated water ligands are terminal and the ninth acts as a bridge between Li(I) cations. Discrete [Li4(HTBA)4(H2O)9]·2H2O complexes form two-dimensional layers. Neighbouring layers are connected via hydrogen-bonding interactions, resulting in a three-dimensional network. Poly[μ2-aqua-tetraaqua(μ4-2-thiobarbiturato-κ(4)O:O:S:S)(μ2-thiobarbiturato-κ(2)O:S)disodium(I)], [Na2(C4H3N2O2S)2(H2O)5]n, (II), crystallizes with six-coordinated Na(I) cations. The octahedra are pairwise connected through edge-sharing by a water O atom and an O atom from the μ4-HTBA(-) ligand, and these pairs are further top-shared by the S atoms to form continuous chains along the a direction. Two independent HTBA(-) ligands integrate the chains to give a three-dimensional network.
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