Hydrated metal complexes of N-(6-amino-3,4-dihydro-3-methyl-5-nitroso-4-oxopyrimidin-2-yl)glycinate: interplay of molecular, molecular-electronic andsupramolecular structures

The title anion, (C7H8N5O4)(-), L-, forms hydrated metal complexes with a r ange of metal ions M+ and M2+. Lithium and manganese(II) form finite molecu lar aggregates [Li(L)(H2O)(3)] (1) and [Mn(L)(2)(H2O)(4)]. 6H(2)O (4) in wh ich the molecular aggregates are linked into three-dimensional frameworks b y extensive hydrogen bonding. The sodium and potassium derivatives, [Na-2(L )(2)(H2O)(3)] (2) and [K(L)(H2O)] (3) both form organic-inorganic hybrid sh eets in which metal-oxygen ribbons are linked by strips containing only org anic ligands: these sheets are linked by hydrogen bonds into three-dimensio nal frameworks. In (2) the metal-oxygen ribbon is built from pairs of edge- shared trigonal bipyramids linked by water molecules, while in (3) it consi sts of a continuous chain of vertex-sharing octahedra. The nitroso group in the anion acts as an eta (1) ligand towards Na+ and as an eta (2) ligand t owards K+. In all cases the anion L- shows the same unusual pattern of inte ratomic distances as the neutral parent LH.