Heterobimetallic f-d complexes: Derivatives of lanthanide(III) beta-diketonates and nickel(II) or copper(II) N,N '-ethylenebis(salicylaldiiminate)

The reaction of stoichiometric quantities of Ln(dik)(3), where Ln = Y, La, or Gd; dik is hexafluoroacetylacetonate (hfa), pivaloytrifluoroacetonate (p ta), or acetylacetonate (acac) ion, and MSalen (M = Cu or Ni; H(2)Salen is a Schiff base prepared from salicylaldehyde and ethylenediamine) produces h eterobimetallic complexes of the composition [(MSalen)ln(dik)(3)]; this is supported by the results of elemental analyses and X-ray diffraction. The s tructure of the complex [(CuSalen)La(pta)(3)] is studied by X-ray diffracti on. The unit cell parameters are determined: space group P (1) over bar, a = 11.235(2) Angstrom, b = 12.356(2) Angstrom, c = 17.410(2) Angstrom, alpha = 96.36(2)degrees, beta = 100.77(2)degrees, gamma = 109.84(2)degrees, Z = 2, R-1 = 0.023. The crystal structure is built from the monomeric molecules , in which CuSalen is incorporated into the coordination sphere of the La3 ion as an additional donor ligand. When heated in vacuum, [(MSalen)Ln(dik) (3)] (dik = pta or hfa) is congruently sublimated in the 255-265 degrees C temperature range; heating [(MSalen)Ln(acac)(3)] results in its decompositi on accompanied by removal of the MSalen molecule.