Two nickel(II) bis­[(pyridin-2-yl)meth­yl]amine complexes with homophthalic and benzene-1,2,4,5-tetra­carb­oxy­lic acids

Two new Ni^II complexes are presented, i.e. a one-dimensional polymeric complex incorporating homophthalate, where the anion acts as the bridging ligand, and a complex incorporating benzene-1,2,4,5-tetra­carboxyl­ate, with two independent Ni centres in different environments, one of them a centrosymmetric 4- dinuclear complex and the other a 2+ mononuclear unit, appearing in a 1:2 ratio. The supra­molecular structure is supported by a profuse hydrogen-bonding network.

On substituted pyrazole derivatives. I. 3-Methyl-4-[(Z)-2-(4-methyl­phenyl)hydrazin-1-yl­idene]-1-(3-nitro­phenyl)-1H-pyrazol-5(4H)-one and 3-methyl-4-[(Z)-2-(4-methyl­phenyl)hydrazin-1-yl­idene]-1-[4-(tri­fluoro­methyl)phenyl]-1H-pyrazol-5(4H)-one

The title substituted pyrazolone compounds, one of them presenting two mol­ecules in the asymmetric unit, differ in the substituents on two terminal benzene rings. The three-dimensional supra­molecular structure is achieved in both cases via a number of C-H...O, C-H...[pi] and [pi]-[pi] weak inter­actions, linking the mol­ecules into more or less compact supra­molecular structures.