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.

5-(3-Chloro­phen­ylsulfan­yl)-1-methyl-3-trifluoro­methyl-1H-pyrazole-4-carbaldehyde O-[(2-chloro-1,3-thia­zol-5-yl)meth­yl]oxime

In the title compound, C₁₆H₁₁Cl₂F₃N₄OS₂, the benzene ring and the thia­zole ring make dihedral angles of 83.2 (3) and 78.3 (3)°, respectively, with the pyrazole ring. The crystal packing shows S...N contacts of 3.309 (2) Å.

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.

2-[4-(Chloro­meth­yl)phen­oxy]-4,6-dimeth­oxy­pyrimidine

The title compound, C₁₃H₁₃ClN₂O₃, was synthesized in the course of the search for novel bioactive pyrimidine derivatives. The C-O-C angle at the phen­oxy O atom is widened to 119.87 (18)°. The dihedral angle between the pyrimidine and benzene rings is 64.2 (3)°.

5-(4-Bromo­phen­oxy)-1-methyl-3-methyl-1H-pyrazole-4-carbaldehyde-O-[(5-meth­oxy-1,3,4-thia­diazol-2-yl)-meth­yl]oxime

In the title mol­ecule, C₁₆H₁₆BrN₅O₃S, the 1,3,4-thia­diazole ring is situated under the benzene ring, forming a dihedral angle of 86.6 (2)°, and with an S...Cg (where Cg is the centroid of the benzene ring) distance of 3.312 (3) Å. The benzene and 1,3,4-thia­diazole rings form dihedral angles of 83.8 (3) and 57.7 (2)°, respectively, with the central pyrazole ring. In the absence of classical hydrogen bonds, the crystal packing is stabilized by a C—H...π inter­action..