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The title complex, H3O+·NH3C(CH3)(PO3H)2 −, contains a hydroxonium ion and an NH3C(CH3)(PO3H)2 − anion. The three H atoms of H3O+ form a pseudo-tetra­hedron by being distributed over four positions with occupation factors of 0.75. Multiple N—H⋯O and O—H⋯O hydrogen bonds in the crystal structure form an intricate three-dimensional supra­molecular network.

The title complex, {[Cd(C7H3NO4)(C12H8N2)(H2O)]·2H2O}n, is a one-dimensional coordination polymer, wherein the Cd atom is seven-coordinated by two 1,10-phenanthroline N atoms, one N and three O atoms from two different pyridine-2,3-dicarboxyl­ate ligands, and one water mol­ecule. It is further extended to a two-dimensional layer structure by hydrogen bonds and π–π stacking inter­actions [centroid-centroid distances of 3.560 (2) and 3.666 (2) Å]. There is a C4 water chain in the structure whose repeat unit contains four water mol­ecules with O⋯O distances in the range 2.748 (3)–2.795 (4) Å. One of the two H atoms of each water of hydration is statistically distributed over two positions with equal occupancy.

Enantioselective syntheses O 0031 A New, Readily Available Double-Component System for Asymmetric Henry Reaction. -A catalytic system consisting of a chiral amino alcohol and cupric acetate is tested in the asymmetric Henry reaction. In most cases, nitro alcohols are obtained with a moderate enantioselectivity. -(HA, W.; SHAN*, Z.; Lett. Org. Chem. 5 (2008) 2, 79-81; Dep. Chem., Wuhan Univ., Wuhan 430072, Hubei, Peop. Rep. China; Eng.) -R. Staver 28-033