Abstract
AbstractSynthesis and crystal structure are described for pyridinium isopolymolybdate of chemical composition (C5H6N)2n[Mo4O13]n. The crystals are triclinic, space group P1, with the following unit‐cell parameters: a =8.2695(11) Å, b =10.544(4) Å, c =11.177(4) Å, α = 71.76(5)°, β = 89.68(3)°, γ = 78.79(3)°, V =906.4(4) Å3, Z = 2 (chemical formula (C5H6N)2[Mo4O13]), D calcd = 2.755 g·cm–3. Crystal structure was solved by Patterson methods and refined to a final R value 0.085 for 4045 independent reflections. The studied compound, considered in analogy to triclinic (NH4)2Mo4O13 as pyridinium polyoctamolybdate, is proposed to be better described as pyridinium isopolytetramolybdate (C5H6N)2n[Mo4O13]n. It seems that the proper coordination number of molybdenum (VI) ions is five, resulting in pyramidal coordination polyhedra [MoO5]. Coordination polyhedra joined by common edges form tetramolybdate monomeric unit [Mo4O13]. The mers are connected by oxygen bridges Mo ‐ O ‐ Mo into infinite ribbon chains. Each two infinite chains are hold together by weaker intermolecular interactions. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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