Die Kristallstruktur von Samarium‐Sesquimolybdat Sm₂[MoO₄]₃

Synthesis, Structure, and Spectroscopic Properties of the New Lanthanum(III) Fluoride Oxomolybdate(VI) La3FMo4O16

“…Sm 2 Mo 3 O 12 exhibits a long, fifth Mo 6+ -O 2distance of almost 242 pm and can therefore not be addressed as Sm 2 [MoO 4 ] 3 ). [14] Thus, the observed distance of 235 pm in the title compound is in good agreement with related compounds. Although the contribution of this fifth, longer bonding association to the effective coordination number (ECoN) [13] of (Mo4) 6+ [δ(ECoN) Mo4-O15Ј = 0.014 to ECoN Mo4 = 3.9604], as well as to the valence state of Mo4 (bond valence contribution of O15Ј = 0.332 to the valence sum of Mo4, amounts to 6.037) [15][16][17] is rather small, this distance cannot be neglected, since the fifth ligand explains the deviation of the remaining four short-bonded oxygen atoms from the ideal tetrahedral arrangement (Table 1).…”

“…Whenever the molybdate units show an enhancement of their coordination number from four to five with one longer distance, the latter ranges in an interval between 230 and 245 pm (e.g. Sm 2 Mo 3 O 12 exhibits a long, fifth Mo 6+ –O 2– distance of almost 242 pm and can therefore not be addressed as Sm 2 [MoO 4 ] 3 ) 14. Thus, the observed distance of 235 pm in the title compound is in good agreement with related compounds.…”

Chloride Derivatives of Lanthanide Ortho‐Oxomolybdates:, 3. Crystal Structures, Spectroscopic Studies, and Magnetic Properties of the LnCl[MoO4] Representatives with the Large Lanthanides (Ln = La, Ce, Pr)

“…K 2 [MoO 4 ]: d (Mo 6+ –O 2– ) = 174–179 pm 21) and the longer distances show similar values as compared to related distances in other oxomolybdates with enhanced coordination numbers (e.g. Sm 2 Mo 3 O 12 : d max (Mo 6+ –O 2– ) = 242 pm 22). In the unit cell, the aforementioned building blocks are arranged according the following Scheme along the crystallographic a axis (Figure 4):…”

Syntheses, Crystal Structures, and Twinning of the Isotypic Rare‐Earth Metal Bromide Ortho‐Oxidomolybdates LaBrMoO4 and CeBrMoO4

“…K 2 [MoO 4 ]: d (Mo 6+ –O 2– ) = 174 – 179 pm29) and the longer distances resemble values found in related arrangements of other oxidomolybdates(VI) with enhanced coordination numbers (e.g. Sm 2 Mo 3 O 12 : d max (Mo 6+ –O 2– ) = 242 pm30).…”