Layered inorganic systems such as ion-exchangers (alpha- and gamma-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 gamma-phase. The materials obtained are thermally stable up to similar to 350 degrees C and the complex decomposition occurs in two (a-phase) or three (gamma-phase) steps. The complex decomposition is complete at similar to 700 degrees C and at 550 degrees C (respectively for alpha- and gamma-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 alpha-materials; whereas, in the case of the gamma-materials, it is present when <= 0.12 moles of the complex/mole of exchanger are inserted. Microanalysis measurements confirm the fact that the Ru(II) complex is not modified when exchanged. (C) 2009 Elsevier Ltd. All rights reserved.