Bis(2-oxopyridinato N-oxide-κ²O,O′)copper(II)

The title complex, [Cu(C₅H₄NO₂)₂], displays a trans-O₂(N-oxide)O₂ square-planar coordination geometry for the Cu^II centre. In the crystal structure, the mol­ecules assemble into a three-dimensional structure by way of intermolecular π–π interactions and weak intermolecular C—H...O interactions.

Di­methyl­[4-methyl-2,6-bis­(phenyl­imino­methyl)­phenolato-κ²N,O]­gallium(III)

The title compound, [Ga(CH₃)₂(C₂₁H₁₇N₂O)], synthesized by the reaction of tri­methyl­gallium and 4-methyl-2,6-bis­(phenyl­imino­methyl)­phenol, has the Ga atom in a tetrahedral geometry; two mol­ecules form a dimer through a π–π interaction.

1,2-Bis(5-chloro-2-methyl-3-thienyl)­cyclo­pentene

In the crystal structure of the title compound, C₁₅H₁₄Cl₂S₂, two substituted thio­phene rings are cis positioned with respect to the double bond of a cyclo­pentene ring. The ring skeleton of the mol­ecule is not planar.

catena-Poly­[[[di­aqua(6-carboxy­pyridine-2-carboxyl­ato-κ³N,O,O′)­samarium(III)]-μ-pyridine-2,6-di­carboxyl­ato-κ⁴N,O,O′:O′′] tetrahydrate]

In the title complex, [Sm(C₇H₃O₄)(C₇H₄O₄)(H₂O)₂]·4H₂O, the coordination number of the Sm atom is nine. The pyridine-2,6-di­carboxyl­ate ligand chelates to the Sm atom and bridges to the neighbouring Sm atoms to form infinite chains along the c axis.

Methanol(2-methyl-1H-imidazole-κN³)(pyridine-2,6-di­carboxyl­ato-κ³N,O,O′)copper(II)

In the title compound, [Cu(C₇H₃NO₄)(C₄H₆N₂)(CH₄O)], the Cu atom lies in the centre of an N₂O₂ square plane, and the methanol mol­ecule is apically coordinated. The coordination geometry is best described as distorted square-pyramidal. There are intermolecular hydrogen bonds in the crystal structure, which mediate the formation of layers.

(Di-tert-butyl­phosphino)cobaltocenium hexa­fluoro­phosphate

In the title compound, [Co(C₁₈H₂₇P)]PF₆, the P—C(cyclo­penta­dien­yl) bond distance [1.840 (4) Å] is significantly shorter than P—C(tert-but­yl) bond distances [1.879 (5) and 1.900 (5) Å]. The PF₆⁻ anion links to the cobaltocenium cation via weak C—H...F hydrogen bonding.