Synthesis and characterization of novel (<Emphasis Type="Italic">E</Emphasis>,<Emphasis Type="Italic">E</Emphasis>)-dioxime and its mono- and polynuclear metal complexes containing azacrown moieties |
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Authors: | Zekeriya Bıyıklıoğlu Beytullah Ertem Selami Karslıoğlu Yaşar Gök |
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Institution: | (1) Department of Chemistry, Karadeniz Technical University, 61080 Trabzon, Turkey;(2) Department of Chemistry, Pamukkale University, 20217 Kınıklı/Denizli, Turkey |
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Abstract: | The novel (E,E)-dioxime,7,8-bis(hydroxyimino)-1,14-bis(monoaza8]crown-6)-benzof]-4,11-dioxa-1,14-diazadecane7,8-g]quinoxaline (H2L), has been synthesized by the reaction of 6,7-diamino-1,12-bis(monoaza18]crown-6)benzof]-4,9-dioxa-1,12-diazadecane (4) which has been prepared by the reduction of 6,7-dinitro-1,12-bis(mono-aza18]crown-6)benzof]-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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