A new cyclotriphosphate tetrahydrate of manganese and distrontium, MnSr2(P3O9)2.4H2O, was obtained as a polycrystalline sample by the method of ion-exchange resin. The cyclotriphosphate studied in this work is the second one having the formula MnSr2(P3O9)2.4H2O after BaZn2(P3O9)2.10H2O. Its crystallographic characterization, infrared studies and thermal behavior are given. The studied phosphate crystallizes in the triclinic system, P-1, with the following unit cell parameters : a = 6,653(1)Å, b = 7,110(1)Å, c = 5,123(1)Å, a = 103,37(2)°, b = 95,81(2)°,  g = 93,04(2)° and Z = 1. The intermediate products of dehydration of MnSr2(P3O9)2.4H2O are MnSr2(P3O9)2.2H2O, mixture of ([Mn(PO3)2]∞ + 2g [Sr(PO3)2]∞) and mixture of ([Mn(PO3)2]∞ + 2b[Sr(PO3)2]∞). The thermal behavior of the studied condensed phosphate has been investigated and interpreted by IR absorption and X-ray diffraction experiments. The title compound can be used as catalyst, ion exchanger, the reactant in ionic conditions, intercalation reactions, superphosphate fertilizer and as an inorganic pigment in ceramics.

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The triphosphate dodecahydrate of cobalt and sodium CoNa3P3O10.12H2O was prepared by the ion exchange resin process. Its structure was studied by X-ray diffraction and determined in the monoclinic space group P121/c1with the unit-cell parameters a = 14.6650(5) Å, b=9.1916(3) Å, c = 15.0239(5) Å, =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, CoNa3P3O10, which was characterized by X-ray diffraction. The obtained CoNa3P3O10 crystallized in monoclinic space group P21/n with the unit-cell parameters a=15,3774 Å, b=7,6988 A°, c=14,2832A°, β=92,9115°.The characteristic IR wavenumbers of the P3O105− ions observed in the vibrational spectra were calculated using isotopic substitutions, which confirms the existence of these groups in the studied compound. A comparison between the IR and Raman wavenumbers of CoNa3P3O10.12H2O, CoNa3P3O10 and Na5P3O10.12H2O was performed. A kinetic study was also made for CoNa3P3O10·12H2O.

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