Synthesis, structure and dioxygen reactivity of Ni (II) complexes with mono-, bis-, tetra-and hexa-oxime ligandsстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2017 г.
Аннотация:Four nickel complexes with β-(oximinoalkyl)amine ligands OxnHn containing one (Ox1H1), two (Ox2H2), four (Ox4H4) and six (Ox6H6) oxime groups were synthesized and characterized by elemental analysis, FTIR, HRMS and single crystal X-ray diffraction. β-Oximinoalkylamines OxnHn act as polydentate ligands forming five-membered chelate rings, in which nickel is coordinated with both amine and oxime nitrogen atoms. In all structurally characterized complexes, OH-groups of oximes arms are involved in hydrogen bonding with counterions (Cl−), which are located in the inner or outer coordination sphere of the nickel atom. Two new structural types of pseudo-octahedral Ni(II) β-oximinoalkylamine complexes containing two ligands per one nickel ion (Ni(Ox1H1)2Cl2 and Ni(Ox2H2)2Cl2) were identified. Dioxygen reactivity of the obtained complexes in aerobic oxidation of triphenylphosphine was studied. Bis-oxime complex Ni(Ox2H2)2Cl2 was found to be the most active promoter of triphenylphosphine oxidation among the synthesized nickel complexes.