Crystal structure and thermal behaviour of (C14H16N)6P6O18·6H2O

Chemical preparation, crystal structure and thermal behaviour are given for a new organic-cation cyclohexaphosphate: ((C6H5CH2)2NH2)6P6O18·6H2O). This compound is monoclinic P21/m with the following unit-cell parameters: a = 10.752(4) Å, b = 24.029(9) Å, c = 13.348(4) Å, β = 106.36(3)° and Z = 2. Crystal structure has been determined and refined to R = 0.041 using 2961 independent reflections. This structure can be described as a stacking of ribbons spreading parallel to the a-direction, formed by the P6O18 ring anions and the water molecules. The ribbons are interconnected by the dibenzylammonium proups.