Magnetic coupling in EE and EO azido-bridged binuclear copper complexes: Synthesis, structure and magnetic studies

Employing Linear Tridentate Ligands with Pyrazole End Groups in Catalytic Tyrosinase Model Chemistry: Does Hemilability Matter?

“…The easily accessible N , N ‐bis[(1 H ‐pyrazol‐1‐yl)methyl]propane‐1‐amine ( pzma ) ligand (Scheme ) exhibits a central amine position which could also be used to connect two tridentate units for the synthesis of dinucleating ligands. Interestingly, prior investigation of bis(pyrazolylmethyl)phenylamine ligands had evidenced hemilabile properties;, i.e., a κ 2 coordination mode for copper(I) resembling our bidentate, catalytically active model systems and a κ 3 mode for copper(II) which should, e.g., stabilize copper(II) µ‐η 2 :η 2 peroxo complexes. In this context, hemilabile ligands may be useful to create a flexible coordination environment which could facilitate the coordination of external substrates for their catalytic conversion .…”

“…As the bipyrazolic ligands can either bind in a κ 2 or κ 3 fashion to copper centers (see above),, , 1a and 1b were treated with copper(II) perchlorate hexahydrate and copper(II) chloride dihydrate in order to determine the bonding mode to copper(II). From these reactions six copper(II) complexes were obtained which were investigated by single‐crystal X‐ray diffraction (Scheme , Table S1).…”

Metal ions directing the geometry and nuclearity of azido-metal(ii) complexes derived from bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine

“…[1][2][3][4] In addition to the terminal monodentate nature of the azido ligand [1][2][3][4] many bridging coordination modes were reported where a magnetic super-exchange mechanism is known to occur through various modes. [5][6][7][8][9][10][11][12][13][14][15][16] These include single and double μ 1,3 -N 3 (end-to-end, EE) [5][6][7][8][9][10][11][12][13][14][15][16][17] and μ 1,1 -N 3 (endon, EO), [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] μ 1,1,3 -N 3 , μ 1,1,1 -N 3 ...…”

“…5,7,18 On the other hand, the double symmetric μ-1,1-azide bridges (IV) are strongly ferromagnetic, provided that the Cu-N azide -Cu angle is less than 108°. 5,[17][18][19][20] Usually the asymmetric μ-1,1azide bridges propagate weak to moderate ferro-or antiferromagnetic interactions. 5 A number of structural parameters have been addressed to explain the magnetic behavior in Cu IIdouble μ-1,3-azido bridges such as a coordination polyhedron around the central Cu(II) ion measured in terms of the distortion from the ideal square pyramidal structure (τ), the Cu-N azide -Cu torsion angle (Δ) and the axial azido nitrogencopper bond length (R).…”

Synthesis, crystal structure, and characterization of two new end-to-end 1D pseudohalide bridged manganese(III) complexes

“…Schiff base, a remarkable group of organic molecules, has appeared as a commonly used chelating ligand for the formation of transition metal complexes [1][2][3][4][5][6][7]. For their fascinating properties in building competent catalysts [8][9][10][11], promising magnetic materials [12][13][14][15], vital pharmaceuticals[16], optoelectronic gadgets [17], bio-mimetic homolog [18] and so on, the newly produced Schiff bases and their complex compounds show considerable dedication to the research community [19][20][21][22][23][24] .…”