Syntheses and Structures of Ni(II) Complexes Containing 2‑alkyliminomethyl Pyrene Ligands

Abstract

The N,O-bidentate ligand 2-((methylimino)methyl)pyren-1-ol (1) gives with nickel acetate in a mixed solvent of toluene and ethanol in the presence of NaOAc the nickel(II) complex 1(Ni). It was characterized by elemental analysis, IR, NMR, MS spectroscopy and single crystal X-ray diffraction. With respect to the nickel atom the complex 1(Ni) adopts a distorted square planar trans-coordination geometry. Concerning the ligand arrangement, complex 1(Ni) has a step configuration with the angle of 35.5o between the mean planes of the pyrene rings in the two independent molecules and step distance S = 1.93 Å, whereas the referent nickel(II) bis(salicylaldiminato) takes a much smaller step configuration with an angle of 17.6o and the step distance S = 0.845 Å (chart 1).

Metal Complexes of π-Expanded Ligands (3): Synthesis and Characterization of tris[2-[(octylimino)methyl]-1-pyrenolato-N,O] cobalt(III)

“…We focus on metal complexes of N-alkylsalicylaldimine (N-Rsal), one of the most basic and important metal complexes in chemistry, and modify the πsystem of this ligand with pyrene. We have recently reported the synthesis and characterization of L and the corresponding metal complex, M II L2 (M = Pt, Pd, Ni) (Chart 1) [1][2][3]. Cobalt N-alkylsalicylaldiminato (Co(N-Rsal)n) and the related complexes show a high binding affinity with dioxygen and are proposed for the best model compounds as artificial blood and dioxygen transport materials (Chart 2) [4,5].…”