Dinuclear Iron(III) and Nickel(II) Complexes Containing N‐(2‐Pyridylmethyl)‐N′‐(2‐hydroxyethyl)ethylenediamine: Catalytic Oxidation and Magnetic Properties

Abstract

Dinuclear Fe and Ni complexes, [(phenO)Fe(N )] (NO ) (1) and [(phenOH)Ni(N ) ] (2), were prepared by treating Fe(NO ) ⋅9 H O and Ni(NO ) ⋅6 H O in methanol, respectively, with phenOH (=N-(2-pyridylmethyl)-N'-(2-hydroxyethyl)ethylenediamine) and NaN ; both 1 and 2 were characterized by elemental analysis, IR spectroscopy, X-ray diffraction, and magnetic susceptibility measurements. Two ethoxo-bridged Fe and two azido-bridged Ni were observed in 1 and 2, respectively; corresponding antiferromagnetic interaction via the bridged ethoxo groups and strong ferromagnetic coupling via the bridged end-on azido ligands within the dimeric unit were observed. Complex 1 did not exhibit any catalytic activity, while 2 exhibited excellent catalytic activities for the epoxidation of aliphatic, aromatic, and terminal olefins.

Proton Switch in the Secondary Coordination Sphere to Control Catalytic Events at the Metal Center: Biomimetic Oxo Transfer Chemistry of Nickel Amidate Complex

“…200 s (Figure 6 a and Figure S10). The X‐band EPR spectrum of 1 is featureless (Figure S11), but an axial signal with g ⊥ = 2.17 and g ∥ = 2.25 developed upon treatment with 1 equiv of mCPBA (Figure S12), which is characteristic of nickel(III) species with low‐spin d 7 ( S = 1/2) electronic configuration [12f,j, 13a, 22] …”

Cu- and Ni-Grafted Functionalized Mesoporous Silica as Active Catalyst for Olefin Oxidation

“…Mo, Ru,, Pd, Fe, Mn, Cu, Ni, etc . incorporated materials have been used as catalysts in C−H activation of alkenes.…”

Synthesis, X-ray structure and DFT calculation of magnetic properties of binuclear Ni(II) complex with tridentate hydrazone-based ligand

“…The Ni-N azido(end-on) -Ni bond angle, the Ni-N azido(end-on) bond lengths and Ni⋅⋅⋅Ni distance observed in binuclear complex 1 fit into the range of values obtained for the ferromagnetically coupled binuclear tetraazido Ni(II) complexes with tridentate or bis-tridentate ligands. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] The positions of the terminal azido ligands with respect to the Ni 2 N 2 plane are defined by the N azido(terminal) -Ni-N azido(end-on) -Ni torsion angles.…”

“…In general, in the binuclear Ni(II) complexes with the core formula [Ni 2 (μ 1,1 -N 3 ) 2 ] 2+ the mono-, bi-, tri-or tetradentate ligands complete the coordination spheres of Ni(II) ions. 1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]22 In some cases, the azide anions function as bridging and terminal ligands. 1,[7][8][9][10][11][12][13][14][15][16][17][18][19][20]22 Scheme 1.…”