Synthesis and spectroscopic properties of Ni(II) complexes of some aroyl hydrazone ligands with 2,6-diacetyl pyridine monooxime: X-ray crystal structure of the salicyloylhydrazone Ni(II) complex

Co(III) and Ni(II) complexes of an anthracene appended aroyl hydrazone: Synthesis, crystal structures, DNA binding and catecholase activity

“…However, in the present case a reverse trend is observed. In fact, the Ni-N distance in this complex is comparatively longer than that normally observed for octahedral Ni(II) complexes of aroylhydrazones [3,39,40], but it is very similar to that reported for an anthracene aldehyde Schiff base complex of Ni(II) [41], and the steric bulk of the anthracene moiety may be responsible for this relatively long Ni-N bond. Important bond distances and bond angles are collected in Table 2.…”

Synthesis, characterization and antimicrobial activity of pentagonal-bipyramidal isothiocyanato Co(II) and Ni(II) complexes with 2,6-diacetylpyridine bis(trimethylammoniumacetohydrazone)

“…Lanthanide complexes with coordination numbers larger than seven were reported [12][13][14][15][16][17] with one dihydrazone ligand and the remaining coordination sites occupied with monodentate or bidentate ligands [12][13][14][15][16][17]; however, in isostructural complexes of Pr(III) and Sm(III) two ligands are pentadentate N 3 O 2 coordinated to the metal ion [14]. Mono-and binuclear octahedral complexes of Ni(II) with 2,6-diacetylpyridine dihydrazones were reported [18][19][20]. In the mononuclear Ni(II) complex, two monodeprotonated dihydrazone ligands are NNO tridentate, coordinated through pyridine nitrogen, azomethine nitrogen and carbonyl oxygen [18].…”

“…Mono-and binuclear octahedral complexes of Ni(II) with 2,6-diacetylpyridine dihydrazones were reported [18][19][20]. In the mononuclear Ni(II) complex, two monodeprotonated dihydrazone ligands are NNO tridentate, coordinated through pyridine nitrogen, azomethine nitrogen and carbonyl oxygen [18]. In binuclear Ni(II) complexes, the dihydrazone ligands are coordinated to one Ni(II) center through protonated amide oxygen and azomethine nitrogen, while the pyridine nitrogen is a bridge between two nickel centers [19,20].…”

Crystal Structures and Spectroscopic and Theoretical Properties of Pentacoordinate Nickel(II) Complexes Containing Tris(pyrazolyl)borate and Quinolinate Ligands

“…Compounds containing Ni II have been less addressed 11,12. Nickel(II) Schiff base complexes12b–12e and 1D polymers12f are blue‐light emitters both in solution and in the solid state. A Ni II octahedral complex containing 6‐methylpyridin‐3‐carboxylate ions12g shows emission maxima at 424 and 461 nm, which are attributed to metal‐perturbed ligand‐centered (LC) and ligand‐to‐metal charge‐transfer (LMCT) transitions, respectively.…”