Synthesis, crystal structure and properties of a organoammonium heteropoly complex, (C6H18N2)3[P2Mo5O23] • 4H2O

A new organoammonium disphosphopentamolybdate with the formula (C6H18N2)(3)[P2Mo5O23]center dot 4H(2)O was synthesized and characterized by single crystal X-ray diffraction, thermal study, IR spectra and UV spectra. The complex crystallizes in the triclinic system, space group P-1 with a = 11.1498(15) angstrom, b = 11.1843(15) angstrom, c = 17.973(3) angstrom, alpha = 95.983(2)degrees, beta = 101.143(2)degrees, gamma = 96.991(2)degrees, V = 2163.8(5) angstrom(3), Z = 2, and R-1 = 0.0385. The structure of heteropoly anion [P2Mo5O23](6-) consists of five MoO6 octahedra and two PO4 tetrahedra. The octahedra form a pentagonal ring by sharing four edges and one corner. The PO4 tetrahedra are attached each one to one side of the ring by three oxygen atoms. The anions are arranged in layers and the interactions between anions are established through hydrogen contacts that involve water molecules and hexanediammonium cations.