[Ni(bpy)(mal)(H₂O)₃]·H₂O and [Ni(4,4′-dmbpy)(mal)(H₂O)₃]·1.5H₂O: syntheses, crystal structures, magnetic properties, and computational study of stacking interactions

Metal Chelate Monomers Based on Nickel Maleate and Chelating N‐Heterocycles as Precursors of Core‐shell Nanomaterials with Advanced Tribological Properties

“…Bands at 1557 (1545) and 1445 (1428) cm –1 correspond to the antisymmetric and symmetrical vibrations of coordinated COO – groups in MCMs. Comparison of the IR spectra of the MCMs synthesized with the spectra of previously obtained related compounds allows us to conclude that the coordination node of the nickel ion contains a bifunctional N‐heterocycle, a monodentate Mal anion and solvent molecules.…”

“…Both carboxyl groups of maleic acid are involved in metal binding with the formation of seven‐membered chelate ring. The interaction of nickel maleate and bpy in water leads to different types of complexes: [Ni(Mal)(bpy)(H 2 O) 3 ] · H 2 O, [Ni(Mal)(bpy) 2 ] · 7.34H 2 O, and [Ni(Mal)(bpy)(H 2 O) 3 ]H 2 O . In particular, in the complex [Ni(Mal)(bpy) 2 ] · 7.34H 2 O, the nickel(II) atom is coordinated in a distorted octahedral arrangement by two O atoms from one carboxylate group of Mal ligand and by four N atoms from two bpy ligands.…”

“…[5] Both carboxyl groups of maleic acid are involved in metal binding with the formation of seven-membered chelate ring. The interaction of nickel maleate and bpy in water leads to different types of complexes: [32][33][34] In particular, in the complex [Ni(Mal)(bpy) 2 ]•7.34H 2 O, the ARTICLE nickel(II) atom is coordinated in a distorted octahedral arrangement by two O atoms from one carboxylate group of Mal ligand and by four N atoms from two bpy ligands. Similarly, the interaction of nickel(II) maleate and phen leads to different complexes: [36] In the complex 2+ cation is nearly octahedrally coordinated by two nitrogen atoms from a phen molecule, one oxygen atom (O1M) from the Mal anion and the oxygen atoms of three water molecules.…”