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Dinuclear Manganese(II) Complexes with Bridging Selenidodiarsenate Anions [As2Se4]4−, [As2Se5]4− and [As2Se6]2−
Authors:Anna Kromm  William S Sheldrick Prof Dr
Institution:Bochum, Lehrstuhl für Analytische Chemie der Ruhr‐Universit?t Bochum
Abstract:Solvothermal reaction of MnCl2(amine)] (amine = terpy and tren) with elemental As and Se at a 1:1:2 molar ratio in H2O/tren (10:1) affords the dimanganese(II) complexes {Mn(terpy)}2(μ‐As2Se4)] ( 1 ) and {Mn(tren)}2(μ‐As2Se5)] ( 2 ) respectively. The tetradentate As2Se4]4? bridging ligands in 1 contain a central As–As bond and exhibit approximately C2h symmetry. Pairs of gauche sited Se atoms participate in five‐membered As2Se2Mn chelate rings. In contrast, two AsSe3 pyramids share a common corner in the As2Se5]4? ligands of 2 and each coordinates an Mn(tren)]2+ fragment through a single terminal Se atom. Such dinuclear complexes are linked into tetranuclear moieties through weak Se···Mn interactions of length 3.026(3) Å involving one of these terminal Se atoms. At a 1:3:6 molar ratio, solvothermal reaction of MnCl2(tren)] with As and Se leads to formation of a second dinuclear complex {Mn(tren)}2(μ‐As2Se6)2] ( 3 ), which contains two bridging bidentate As2Se6]2? ligands. These are cyclic with an As2Se4 ring and can be regarded as being derived from As2Se5]4? anions by formation of two Se‐Se bonds to an additional Se atom.
Keywords:Selenidoarsenates  Manganese  Solvothermal synthesis  Crystal structure
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