Abstract
Chemical preparation, calorimetric studies, crystal structure and spectroscopic investigations are given for a new organic cation diphosphate: (o-CH3C6H4NH3)2H2P2O7. This compound is monoclinic P21/c with the following unit cell parameters: a=15.258(3), b=19.696(4), c=11.578(5) Å, β=89.93(2)° and Z=8. Crystal structure has been determined and refined to R=0.049, using 5660 independent reflections. The atomic arrangement can be described as a succession of inorganic layers parallel to a→,c→ planes. The organic groups (o-CH3C6H4NH3)+ are anchored onto two phosphoric layers through multiple hydrogen bonds that show a three-dimensional infinite network.
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