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Single crystals of [(CH 3 ) 4 N]FeF 4 ·H 2 O have been prepared from aqueous HF solution. The crystal structure was determined by X-ray diffraction: space group P1̄, Z = 2 (or 1 dimeric unit), a = 705.7(5), b = 818.5(8), c = 915.2(12) pm, α = 65.46(10)°, β = 82.90(9)°, γ = 72.76(7)°, R/wR = 0.047/0.021. The structure consists of centrosymmetrical dimeric anions [Fe 2 F 8 (H 2 O) 2 ] 2-  with fluorine double bridges and is isotypic with [(CH 3 ) 4 N]VOF 3  · H 2 O. Intramolecular H-bonds are found between the axial water and fluoride ligands. By additional strong intermolecular H-bonds (O ··· F 258 pm) the anions are connected to form infinite parallel chains between which the TMA cations are located. [(CH 3 ) 4 N]AlF 4  · H 2 O is shown to be isotypic.

zeitschrift für naturforschung b

Notizen: Die Kristallstruktur von [(CH 3 ) 4 N]FeF 4  · H 2 O mit einem di(µ-fluoro)-verbrückten [Fe 2 F 8 (H 2 O) 2 ] 2– -Anion / Crystal Structure of [(CH 3 ) 4 N]FeF 4  · H 2 O with a Di(μ-fluoro)-Bridged [Fe 2 F 8 (H 2 O) 2 ] 2-  Anion