The title compound K2CoP2O7 has been prepared as single crystals by a solid state reaction at 680°C. It was characterized by powder X-ray diffraction, scan electronic microscopy, infrared and UV-visible spectroscopies. The structure determined by single crystal X-ray diffraction, is isomorphous with Na2CoP2O7. The cell is tetragonal P42/mnm, a = 7.926(Å) ; c = 11.350(Å) and Z = 4. The framework is a layered structure. The Na cations are located between layers and insure the cohesion of the structure.
A. Guesmi, A. Driss
diphosphate, potassium, cobalt(lI), layer framework
Pages 1675-1683
Chemical preparation, structural, thermal behavior and IR studies are reported for a new monoclinic organic cyclotetraphosphate, [NH3(CH2)5NH3]2P4O12. 2H2O, having the following parameters : a = 8.471(1) Å, b = 15.958(2) Å. c = 9.175(2) Å, β = 108.29(2)°, V = 1177.6(3) Å3, ρcal. = 1.58 g/cm3, ρmes. = 1.57 g/cm3, P21/c, Z = 2. Atomic arrangement of 1,5-diammonium pentane cyclotetraphosphate dihydrate is described by a three dimensional network. The P4O12 anion having a Ci local symmetry, is surrounded by ten organic groups and four water molecules. Organic cation environment is made by five P4O12 groups and one water molecule. Thermal behavior exhibits the presence of two water molecules. IR bands are attributed by comparison with spectra of similar other compounds.
I. Aoun, M. Bdiri, A. Jouini
Cyclotetraphosphates, crystal structure, thermal behavior, 1R spectroscopy
Pages 1685-1695