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The title compound crystallized in the monoclinic space group P21/n (No. 14) [a = 11.211 (5), b = 12.862 (3), c = 23.05 (1) Å, β = 94.37 (3)°, V = 3314 (2) Å3, Z = 2]. The polyanion can be regarded as a dimer of a phenylphosphonatohexamolybdate, (C6H5P)Mo6O23(H2O)3, linked by four O atoms. In this monomeric unit the six molybdenum octahedra are grouped into two parts consisting of four and two edge-sharing octahedra, respectively. These two parts are connected by two corner-sharing O atoms to form a bent Mo6 ring. The phenylphosphonate group coordinates to the Mo6 ring from the narrow side as a tripodal ligand. The {(C6H5P)Mo6O21(H2O)3}2 units form layers parallel to (001) and the structure is stabilized by hydrogen bonds between water and neighboring anions. The monomeric unit has been shown to be a key structure in the process of deducing the aqueous solution structures of the (C6H5P)Mo_6^{2-} and (C6H5P)Mo_7^{4-} species found in a previous equilibrium study of the H+–MoO_4^{2-}–(C6H5P)O_3^{2-} system.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablock phenno

fcf

Structure factor file (CIF format)
Contains datablock phenno

CCDC reference: 131985

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