A Water Sensitive Hydrate: The Bis-Catena Complex Salt [Mn(H₂O)₆][BiI₄]₂·2H₂O

Manuela Erbe (1) , Daniel Köhler (1) , Michael Ruck (1)

1 Fachrichtung Chemie und Lebensmittelchemie

Bright red crystals of [Mn(H₂O)₆][BiI₄]₂·2H₂O are obtained from a solution of MnI₂, BiI₃, and I₂ in absolute ethanol, which is exposed to humid air. Reversible dehydratization sets in at about 50 °C. Added water decomposes the hydrate by irreversible precipitation of BiOI. The optical band-gap is about 1.9(1) eV. X-ray diffraction on a single-crystal revealed a monoclinic lattice (space group P2₁/c) with a = 760.39(4) pm, b = 1315.6(1) pm, c = 1398.37(7) pm, and β = 97.438(4) °. In the crystal structure zigzag chains of edge-sharing [BiI_2/1I_4/2]^– octahedra and linear strings of H₂O-bridged [Mn(H₂O)₆]²⁺ octahedra run parallel [100].

Mots clés: Physical Sciences

Manuela Erbe, Daniel Köhler, Michael Ruck. A Water Sensitive Hydrate: The Bis-Catena Complex Salt [Mn(H₂O)₆][BiI₄]₂·2H₂O. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, 636 (8), pp.1513. ⟨10.1002/zaac.201000069⟩. ⟨hal-00552456⟩