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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Praseodymium(III)-monoacetatohexaaquo-dichloridemonohydrate, [Pr(CH3COO)(H2O)6]Cl2 · H2OSingle crystals of [Pr(CH3COO)(H2O)6]Cl2 · H2O (pale green) may be obtained from a solution of PrCl3 · 7 H2O in aqueous acetic acid by isothermic evaporation at room temperature. [Pr(CH3COO)(H2O)6]Cl2 · H2O crystallizes with the triclinic system, space group P1 (No. 2); a = 872.27(9) pm, b = 933.02(8) pm, c = 961.75(9) pm; α = 105.238(9)°, β = 107.913(9)°, γ = 110.568(8)°; R = 0.023, Rw = 0.022 (Z = 2). Pr3+ is nine-coordinated by O2- of six water molecules, one bidentate acetate group, and the bridging oxygen from another (formally monodentate) acetate anion. Centrosymmetric dimers {[Pr(CH3COO)(H2O)6]2}4+ are thus formed, held together by four “lone-some” Cl- anions and two “zeolithic” water molecules per dimer. The chloride ions are surrounded by five (Cl1) and six (Cl2) aquo ligands, respectively. The “zeolithic” water molecule (O9z) has four aquo ligands and two chloride ions (Cl1 and Cl2) as nearest neighbours.
    Notes: [Pr(CH3COO)(H2O)6]Cl2 · H2O wird in Form von blaßgrünen Einkristallen durch Eindunsten wäßriger, essigsaurer Lösungen von PrCl3 · 7 H2O erhalten. Die Verbindung kristallisiert triklin (Z = 2), Raumgruppe P1 (Nr. 2); a = 872,27(9) pm; b = 933,02(8) pm; c = 961,75(9) pm; α = 105,238(9)°; β = 107,913(9)°; γ = 110,568(8)°; R = 0,023; Rw = 0,022. Pr3+ ist von insgesamt neun Sauerstoffatomen umgeben: Sechs gehören zu „Hydratwasser“-Molekülen, zwei zu einer chelatartig angreifenden, das neunte zu einer einzähnig koordinierenden Acetatgruppe. Durch Verbrückung über Acetationen entstehen zentrosymmetrische Dimere {[Pr(CH3COO)(H2O)6]2}4+, die durch vier „einsame“ Cl--Ionen und zwei weitere Wassermoleküle pro Dimer zusammengehalten werden. Die Chloridionen sind von fünf (Cl1) bzw. sechs (Cl2) Wasserliganden umgeben, das „zeolithische“ Wasser (O9z) hat vier Wassermoleküle und zwei Chloridionen (Cl1 und Cl2) als nächste Nachbarn.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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