Diaqua­bis­(4-hy­droxy-5-nitro­pyridine-2-carboxyl­ato-κ²N¹,O²)copper(II)

In the title compound, [Cu(C₆H₃N₂O₅)₂(H₂O)₂], the Cu^II ion, lying on an inversion center, is coordinated by two pyridine N atoms and two carboxyl­ate O atoms from symmetry-related two 4-hy­droxy-5-nitro­pyridine-2-carboxyl­ate ligands, and two water mol­ecules, forming a distorted octa­hedral geometry. In the crystal, O—H...O hydrogen bonds link the complex mol­ecules. One of the H atoms of the water mol­ecule is disordered over two sites of equal occupancy.

Poly[[dodeca­aqua­bis­(μ₃-pyridine-2,6-dicarboxyl­ato)tetra­kis­(μ₂-pyridine-2,6-dicarboxyl­ato)tri­calciumdieuropium(III)] 10.5-hydrate]

In the title compound, {[Ca₃Eu₂(C₇H₃NO₄)₆(H₂O)₁₂]·10.5H₂O}_n, the Eu^III ion is nine-coordinated by three tridentate pyridine-2,6-dicarboxyl­ate (PDA) ligands, forming a [Eu(PDA)₃]³⁻ building block. The Ca²⁺ ions adopt two types of coordination geometries. One Ca²⁺ ion, lying on a twofold rotation axis, is eight-coordinated by four carboxyl­ate O atoms from four PDA ligands and four water mol­ecules, and the other two Ca²⁺ ions, each lying on an inversion center, are six-coordinated by two carboxyl­ate O atoms from two PDA ligands and four water mol­ecules. The carboxyl­ate groups bridge the Eu^III and Ca²⁺ ions into a three-dimensional porous framework, with channels extending along [010] and [001] in which lattice water mol­ecules are located. Two of the lattice water mol­ecules are disordered over two sets of sites with equal occupancy and one water mol­ecule is 0.25-occupied. Numerous O—H...O hydrogen bonds involving the water mol­ecules and carboxyl­ate O atoms are present.

tert-Butyl 6-amino-5-cyano-2-(2-meth­oxy­eth­yl)nicotinate

The title compound, C₁₄H₁₉N₃O₃, was synthesized by the reaction of 3-meth­oxy­propionitrile, tert-butyl bromo­acetate and eth­oxy­methyl­enemalononitrile. In the crystal, N—H...O hydrogen bonds link the mol­ecules into chains propagating along the b axis.