Crystal structure of a layered phosphate molybdate KGd(PO)(MoO).

The title compound dipotassium gadolinium(III) phosphate(V) molybdate(VI), KGd(PO)(MoO), was synthesized from a high-temperature melt starting from GdF as a source of gadolinium. Its structure is isotypic with other ( O)(PO) compounds, where = Na, K or Cs, and = rare-earth cation, = Mo or W. The three-dimensional framework is built up from [Gd(PO)(MoO)] anionic sheets, which are organized by adhesion of [GdPO] layers and [MoO] tetra-hedra stacked above and below these layers.

Crystal structure, Hirshfeld surface analysis and geometry optimization of 2-hy-droxy-imino--[1-(pyrazin-2-yl)ethyl-idene]propano-hydrazide.

In the mol-ecule of the title compound, CHNO, the oxime and hydrazide groups are situated in a -position in relation to the C-C bond linking the two functional groups. The CHC(=NOH)C(O)NH fragment deviates from planarity because of a twist between the oxime and amide groups. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming zigzag chains in the [013] and [03] directions.

Crystal structure of (2,2'-bi-pyridine-κ,')bis-(3,5-di--butyl--benzo-quinonato-κ,')ruthenium(II).

In the title mononuclear complex, [Ru(CHO)(CHN)], the Ru ion has a distorted octa-hedral coordination environment defined by two N atoms of the chelating 2,2'-bi-pyridine ligand and four O atoms from two 3,5-di--butyl-benzo-quinone ligands. In the crystal, the complex mol-ecules are linked by inter-molecular C-H⋯O hydrogen bonds and π-π stacking inter-actions between the 2,2'-bi-pyridine ligands [centroid-centroid distance = 3.538 (3) Å], resulting in a layer structure extending parallel to the plane.

Crystal structure of 9,9'-{(1,1')-[1,4-phenyl-enebis(aza-nylyl-idene)]bis-(methanylyl-idene)}bis-(2,3,6,7-tetra-hydro-1,5-pyrido[3,2,1-]quinolin-8-ol).

The whole mol-ecule of the title compound, CHNO, is generated by inversion symmetry; the central benzene ring being situated about the crystallographic inversion center. The aromatic ring of the julolidine moiety is inclined to the central benzene ring by 33.70 (12)°.

Crystal structure of 5-[(4-carb-oxy-benz-yl)-oxy]isophthalic acid.

The mol-ecular shape of the title compound, C16H12O7, is bent around the central CH2-O bond. The two benzene rings are almost perpendicular to one another, making a dihedral angle of 87.78 (7)°.

Crystal structure of poly[di-aqua-(μ-2-carb-oxy-acetato-κ(3) O,O':O'')(2-carb-oxy-acetato-κO)di-μ-chlorido-dicobalt(II)].

The asymmetric unit of the title polymer, [Co2(C3H3O4)2Cl2(H2O)2] n , comprises one Co(II) atom, one water mol-ecule, one singly deprotonated malonic acid mol-ecule (HMal(-); systematic name 2-carb-oxy-acetate) and one Cl(-) anion. The Co(II) atom is octa-hedrally coordinated by the O atom of a water mol-ecule, by one terminally bound carboxyl-ate O atom of an HMal(-) anion and by two O atoms of a chelating HMal(-) anion, as well as by two Cl(-) anions. The Cl(-) anions bridge two Co(II) atoms, forming a centrosymmetric Co2Cl2 core.