INVESTIGATIONS ON THE CHEMICAL-TRANSPORT OF THE ANHYDROUS EUROPIUM CHLORIDES EUCL2, EU5CL11, EU4CL9, EU14CL33 AND EUCL3 WITH ALCL3

Aluminium trichloride is known as a versatile transporting agent for r are-earth trichlorides, but in case of europium the dichloride EuCl2 a s well as the mixed-valence compounds Eu5Cl11, Eu4Cl9 and Eu14Cl33 can be chemically transported, too. The observed transport directions are discussed in terms of partial-pressure and solubility diagrams. Under appropriate conditions the gas-phase complex Eu(AlCl4)2 is obtained a s a crystalline solid. Being isostructural with Sr(AlCl4)2, the crysta l structure of which has been determined very recently, Eu(AlCl4)2 is the first chloroaluminate of a rare-earth element in the divalent stat e.