Ethylenediamine complexes of transition metals in zeolite X

Single-crystal X-ray diffraction studies of two ion-exchanged zeolite forms of the faujasite type are performed. Form I, NaCu[Cu(en)(2)]X [a = 25.013( 5) Angstrom, space group Fd3, 315 F(hkl), R = 0.050], is obtained by the tr eatment of zeolite NaX crystals with a [Cu(en)(2)]SO4 solution. Form II, Na Co[Co(en)(x)]X [a = 25.000(5) Angstrom, space group Fd3, 532 F(hkl), R = 0. 051], is obtained by the treatment of zeolite NaCoX with an ethylenediamine solution. Along with Na, Cu, and Co ions situated at the positions typical of zeolite X, the cationic complexes [Cu(en)(2)](2+) and [Co(en)(x)](2+) a re found to be located in the large-sized zeolite cavities.