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Two oxo complexes with tetra­nuclear [Fe4(μ3‐O)2]8+ and trinuclear [Fe3(μ3‐O)]7+ units
Authors:Ana María Atria  María Teresa Garland  Ricardo Baggio  Piedad Corts
Abstract:Two new oxo complexes, namely hexa‐μ2‐acetato‐acetato­aquabis­(di‐3‐pyridylamine)di‐μ3‐oxo‐tetra­iron(III) chloride mono­hydrate ethanol 1.25‐solvate, Fe4(C2H3O2)7O2(C10H9N3)2(H2O)]Cl·1.25C2H6O·H2O, (I), containing a tetra­nuclear Fe43‐O)2]8+ unit, and 2‐methyl­imidazolium hexa‐μ2‐acetato‐acetatodiaqua‐μ3‐oxo‐triiron(III) chloride dihydrate, (C4H7N2)Fe3(C2H3O2)7O(H2O)2]Cl·2H2O, (II), with a trinuclear Fe33‐O)]7+ unit, are presented. Both structures are formed by two well differentiated entities, viz. a compact isolated cluster composed of FeIII ions coordinated to O2? and CH3CO2? anions, and an external group formed by a central Cl? ion surrounded by different solvent groups to which the anion is bound through hydrogen bonding. In the case of (I), charge balance cannot be achieved within the groups, so the structure is macroscopically ionic; in the case of (II), in contrast, each group is locally neutral owing to the inter­nal compensation of charges. The trinuclear complex crystallizes with the metal cluster, chloride anion and 2‐methyl­imidazolium cation bisected by a crystallographic mirror plane.
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