STRUCTURE OF A NEW TRINUCLEAR NICKEL(II) COMPLEX WITH A SALEN-TYPE BISOXIME LIGAND

salen-type bisoxime ligand Ni(II) complex synthesis crystal structure

ZINC(II) COMPLEXES WITH THE TETRADENTATE SCHIFF BASE LIGAND N,N?-BIS(1-PYRIDIN-2-YL-ETHYLIDENE)PROPANE-1,3-DIAMINE: SYNTHESIS AND CRYSTAL STRUCTURES, КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА НИТРАТА {АКВАИМИДАЗОЛ-[2-(2-карбамоилгидразон)-пропионато]}меди(II), ...

The results show that the Ni(II) complex consists of three Ni(II) ions, two tetradentate (-L)2– units, two coordinated -acetate ions, two coordinated DMF molecules, and two crystallization DMF molecules. <...> All hexacoordinated Ni(II) ions of the complex have a slightly distorted octahedral geometry. <...> The crystal packing of the Ni(II) complex reveals a notable feature of this structure: the formation of an infinite supramolecular 2D layered structure by virtue of intermolecular C—HᄷO hydrogen bonding. <...> Since the highly electronegative oxygen atom strongly affects azomethine nitrogen of N2O2 salen-type bisoxime ligands, thus influencing the N2O2 coordination core and possibly leading to diverse novel structures of the resulted complexes, we began to study monomers where the nitrogen and oxygen environment of the metal center is provided by tetradentate ligands [ 5 ]. <...> It is common knowledge that acetate ions often play an important role in coordination chemistry, -. 559 – 564 and they can adopt various binding modes such as terminal monodentate, chelating to one metal center, bridging bidentate in a syn-syn, syn-anti and anti-anti, and bridging tridentate to two metal centers [ 19—21 ]. <...> This contribution reports a new trinuclear Ni(II) cluster {[NiL(DMF)]2(OAc)2Ni}Œ2DMF (H2L = 4,4-dichloro-2,2-[(1,3-propylene)dioxybis(nitrilomethylidyne)]diphenol) and its structural characterization. <...> Molar conductance measurement was carried out on a model DDS-11D type conductivity bridge using a 1.0ė103 mol ŒL–1 solution in DMF at 25 ēC. Synthesis of H2L. <...> When the solvent was partially evaporated, several green block-shaped single crystals suitable for X-ray crystallographic analysis were obtained, yield 28.6 %. <...> The complete crystallographic data were deposited as a CIF file in the Cambridge Structural Database (CCDC No. 757708) and are available freely upon request citing the deposition number from the web site: www.ccdc.cam.ac.uk/data_request/cif. <...> IR spectra of H2L and the corresponding Ni(II) complex exhibit several distinguishable bands in the 400—4000 cm–1 region. <...> The O—H stretching frequency of the salentype ligand is expected in the 3300—3800 cm–1 region <...>

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