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- W66970976 abstract "Transition metal complexes M(HL)2·nH2O (M(II)=Mn, n=2 (1); Co, n=3 (2); Ni, n=4 (3); Cu, n=3 (4); Zn, n=2 (5); Pb, n=0 (6)) of 4,5-diazafluorene-9-one salicyloylhydrazone (H2L), have been prepared by the reaction of H2L with the metal(II) acetates in EtOH–DMF. X-ray diffraction studies showed that the ligand in the solid state has a pseudo-helical structure in the keto-form. In complexes Mn(HL)2(H2O)2 (1) and Co(HL)2(DMF)2 (2a), the ligand coordinates to the metal ion as a mononegative ion in the enol-form with the enolic oxygen and azomethine nitrogen atoms of the aroylhydrazone group forming a five-membered chelate ring, while the phenolic hydroxyl group and pyridyl-N atoms of the diazafluorene moiety are free. The metal atoms are in octahedral geometry with N2O4 from two ligands HL in the equatorial plane and the axial sites occupied by solvent molecules. The structures were also characterized by IR and 1H NMR spectroscopy." @default.
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- W66970976 date "2000-06-01" @default.
- W66970976 modified "2023-10-11" @default.
- W66970976 title "Chemistry of aroylhydrazones II." @default.
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- W66970976 doi "https://doi.org/10.1016/s0277-5387(00)00389-2" @default.
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