Chemical preparation, crystal structure and vibrational study of MnNa3P3O10.12H2O and X-ray characterization of the new anhydrous triphosphate MnNa3P3O10

Abstract

ABSTRACT The MnNa3P3O10.12H2O was prepared by the ion exchange resin process. Its structure was studied by X-ray diffraction and determined in the monoclinic, space group P121/c1 with the unit-cell parameters a = 14.6650 (5) Å, b = 9.1916 (3) Å, c = 15.0239 (5) Å, α = γ = 90 °, β = 90.2210 (10) °, Z = 4 and V = 2025.13 (12) Å3. The thermal dehydration of this compound was performed, leading to an anhydrous new form MnNa3P3O10, which was characterized by X-ray diffraction. The obtained MnNa3P3O10 is monoclinic of space group: P21/n with the unit-cell parameters: a = 15.3774 (1) Å, b = 7.6988 (5) Å, c = 14.2832 (3) Å, β = 92.9115 (5) °. The characteristic IR wavenumbers of the P3O10 5− ions observed in the vibrational spectra were calculated by using isotopic substitutions, which confirms the existence of these groups in the studied compound. A comparison between the IR and Raman wavenumbers of MnNa3P3O10.12H2O, MnNa3P3O10 and Na5P3O10.12H2O was performed. A kinetic study was also made for MnNa3P3O10·12H2O.