Synthesis, Crystal Structure and Properties of a Organoammonium Heteropoly Complex, (C₆H₁₈N₂)₃ [P₂Mo₅O₂₃] · 4H₂O

Abstract

A new organoammonium disphosphopentamolybdate with the formula (C₆H₁₈N₂)₃[P₂Mo₅O₂₃] · 4H₂O 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) Å, b=11.1843(15) Å, c=17.973(3) Å, α=95.983(2)°, β=101.143(2)°, γ=96.991(2)°, V=2163.8(5) ų, Z=2, and R₁=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.

Keywords:

• molybdenum complex
• organoammonium salt complex
• phosphopolyoxometallate complex
• spectra and structure