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- W2006042152 abstract "Abstract The behaviour of Fe II and Fe III ions in combination with the potential ligand 1,4‐bis(2‐pyridyl‐methyl)piperazine (BPMP) under anhydrous conditions has been investigated. BPMP has been reacted with FeCl 2 , FeCl 3 and [Fe(OTf) 2 (MeCN) 2 ]. This led to the isolation of four new complexes, which were fully characterized and structurally investigated by single crystal X‐ray diffraction. It turned out that in the presence of chloride co‐ligands Fe III favours the tetradentate coordination mode of BPMP with the piperazine unit in a boat configuration, like for instance in [BPMP(Cl)Fe( μ ‐O)FeCl 3 ] or [BPMP‐FeCl 2 ][FeCl 4 ], ( 1 ). However, the employment of FeCl 2 leads to the formation of a coordination polymer [BPMP‐FeCl 2 ] n , ( 2 ), containing the piperazine ring in a chair configuration binding to two iron centres each. 2 can only be dissolved in very polar solvents like dmf which is capable of breaking up the polymeric structure under formation of [Cl 2 (dmf)Fe( μ ‐BPMP‐1 κ 2 N , N :2 κ 2 N , N ))Fe(dmf)Cl 2 ]·2 dmf, ( 3 ). In contrast, using [Fe(OTf) 2 (MeCN) 2 ] instead of FeCl 2 as the starting material leads to a mononuclear Fe II complex with BPMP bound in the desirable tetradentate fashion: [BPMP‐Fe(OTf) 2 ], ( 4 ). Unlike other complexes with tetradentate N/py ligands the two residual ligands in 4 are bound almost trans to each other with the potential to adopt a cis orientation under oxidising conditions, and it will be interesting to exploit its catalytic properties in future." @default.
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- W2006042152 date "2006-05-29" @default.
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- W2006042152 title "The Coordination Chemistry of Iron with the 1,4-Bis(2-pyridyl-methyl)piperazine Ligand" @default.
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- W2006042152 doi "https://doi.org/10.1002/zaac.200600003" @default.
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