Intercalation of Ru(II) tris (1,10-phenanthroline) complex in ±- and ³-zirconium dihydrogen phosphate. Synthesis, thermal behaviour and X-ray characterization

Layered inorganic systems such as ion-exchangers (±- and ³-zirconium dihydrogen phosphate) already used as hosts for larger cations, were studied for the intercalation of Ru(II) tris (1,10-phenanthroline) complex into these host matrices. The uptake of the complex occurs using the batch method; the colour of the materials changes from white to brilliant orange; the highest ion uptake is obtained in the case of the ³-phase. The materials obtained are thermally stable up to ~350 °C and the complex decomposition occurs in two (±-phase) or three (³-phase) steps. The complex decomposition is complete at ~ 700 °C and at 550 °C (respectively for ±- and ³-Ru(II) materials). As can be seen from the X-ray patterns, the Ru(II) materials are still layered and show a new phase with an increase in the interlayer distance with respect to the starting materials. The hydrogen form is always present in the case of the ±-materials; whereas, in the case of the ³-materials, it is present when d0.12 moles of the complex/mole of exchanger are inserted. Microanalysis measurements confirm the fact that the Ru(II) complex is not modified when exchanged.