Abstract
The novel (E,E)-dioxime,7,8-bis(hydroxyimino)-1,14-bis(monoaza[8]crown-6)-benzo[f]-4,11-dioxa-1,14-diazadecane[7,8-g]quinoxaline (H2L), has been synthesized by the reaction of 6,7-diamino-1,12-bis(monoaza[18]crown-6)benzo[f]-4,9-dioxa-1,12-diazadecane (4) which has been prepared by the reduction of 6,7-dinitro-1,12-bis(mono-aza[18]crown-6)benzo[f]-4,9-dioxa-1,12-diazdecane (3) and cyanogendi-N-oxide. Mononuclear NiII and CuII complexes of H2L have a metal:ligand ratio of 1:2 and the ligand coordinates through two hydroxyimino nitrogen atoms, as do most of the (E,E)-dioximes. The hydrogen-bridged NiII complex was converted into its BF +2 capped anologue by the reaction with BF3 · Et2O. The reaction of the CuII complex with 2,2′-dipyridyl as an end-cap ligand gave the homotrinuclear complex. Structures for the ligand and its complexes are proposed in accordance with elemental analysis, magnetic susceptibility measurements, 1H, 13C-n.m.r, IR and MS spectral data.
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Bıyıklıoğlu, Z., Ertem, B., Karslıoğlu, S. et al. Synthesis and characterization of novel (E,E)-dioxime and its mono- and polynuclear metal complexes containing azacrown moieties. Transition Met Chem 32, 591–596 (2007). https://doi.org/10.1007/s11243-007-0215-5
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DOI: https://doi.org/10.1007/s11243-007-0215-5