E4 Butterfly Complexes (E=P,As) as Chelating Ligands |
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| Authors: | Dr Christoph Schwarzmaier Dr Sebastian Heinl Dr Gábor Balázs Prof?Dr Manfred Scheer |
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| Institution: | Institut für Anorganische Chemie der Universit?t Regensburg, 93040 Regensburg (Germany) |
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| Abstract: | The coordination properties of new types of bidentate phosphane and arsane ligands with a narrow bite angle are reported. The reactions of {Cp′′′Fe(CO)2}2(μ,η1:1‐P4)] ( 1 a ) with the copper salt Cu(CH3CN)4]BF4] leads, depending on the stoichiometry, to the formation of the spiro compound {{Cp′′′Fe(CO)2}2(μ3,η1:1:1:1‐P4)}2Cu]+BF4]? ( 2 ) or the monoadduct {Cp′′′Fe(CO)2}2(μ3,η1:1:2‐P4){Cu(MeCN)}]+BF4]? ( 3 ). Similarly, the arsane ligand {Cp′′′Fe(CO)2}2(μ,η1:1‐As4)] ( 1 b ) reacts with Cu(CH3CN)4]BF4] to give {{Cp′′′Fe(CO)2}2(μ3,η1:1:1:1‐As4)}2Cu]+BF4]? ( 5 ). Protonation of 1 a occurs at the “wing tip” phosphorus atoms, which is in line with the results of DFT calculations. The compounds are characterized by spectroscopic methods (heteronuclear NMR spectroscopy and IR spectrometry) and by single‐crystal X‐ray diffraction studies. |
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| Keywords: | arsenic butterfly complexes chelate ligands phosphorus protonation |
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