Summary
The ligand, potassium bicyclo[2.2.1]-hept-5-en-endo-2-oyl-hydroxylamine-3-carboxylate-monohydrate, KHL·H2O2 and its M(HL)2 complexes, [{Fe(HL)2}2SO4], K[FeL2] and K2[ML2] (M=MnII, FeII, CoII, NiII, CuII and ZnII) were prepared and characterized. For all, except the sulphate complex of iron(III), a monomeric octahedral configuration was postulated and this is realized through the coordination of oxygen atoms of the carboxylic, carbonyl and oxime group of two mono-or di-anion ligands. The dianionic form of the ligand is the result of deprotonation of the carboxylic group and mide-alcohol form of the hydroxamic group. For the sulphate-containing iron(III) complex a dimeric coordination is proposed with two monoanions of the organic ligand (the carbonyl oxygens are not coordinated) and the bridging SO4 group. The relative degree of covalency of the metal-carboxylic oxygen bond is 10.6–45.2% and increases in the order: MnII<FeII<CoII<NiII<ZnII<FeIII. The complexes have been characterized by elemental and t.g. analysis and i.r. spectra.
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Midyanko, O.V., Galla, V.Y., Buzash, V.M. et al. Synthesis and physico-chemical characterization of coordination compounds of 3d metals with potassium bicyclo[2.2.1]-hept-5-en-endo-2-oyl-hydroxylamine-3-carboxylate. Transition Met Chem 15, 156–159 (1990). https://doi.org/10.1007/BF01023907
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DOI: https://doi.org/10.1007/BF01023907