Preparation and structure of a series of cyclohexaphosphates: M(p-CH3C6H4NH3)4P6O18·8H2O (M = Cd, Co, Zn, and Cu)

Four new cyclohexaphosphates with the general formula M(p-CH3C6H4NH3)4P6O18·8H2O (M: Cd, Co, Zn, and Cu) are reported. They crystallize with triclinic unit cells and are isotopic. As an example, we give the parameters of Cd(p-CH3C6H4NH3)4P6O18·8H2O: a = 13.834(2), b = 9.974(2), c = 9.134(1) Å, α = 108.12(1), β = 91.93(1), γ = 93.45(1)°, Z = 1, P1̄, V = 1193.9(6) Å3, and Dx = 1.618 g·cm−3. The crystal structure was determined using 5214 independent reflections with a final R = 0.027. The atomic arrangement can be described as layers built up by P6O186− ring anions, Cd cations, and water molecules, parallel to the (100) planes. Organic cations are located between these layers.