The unit-cell parameters and crystal-lattice symmetry of hydrates of yttrium(III) and lanthanide(III) 2-furancarboxylates have been determined. Two isostructural series have been found: the first includes the La, Ce and Pr complexes with formula Ln(C5H303)3 • 2 H2O having monoclinic crystals (space group Pljc), the second includes the Y and Nd-Yb complexes with composition Ln(CsH303)3 • 3H2O which crystallize in Space group C2/c. The Lu complex crystals are different from those two series.In connection with the study of lanthanide(III) complexes with 2-furancarboxylic acid by Brzyska and Kröl (1985 a, b, c) the preliminary crystal data for monocrystals of these complexes have been determined. The crystal data (Table 1) were obtained from oscillation, de Jong-Botmian and/or Weissenberg X-ray pattems with CuAix radiation. Monocrystals of the Tm, Yb and Lu complexes were unstable on air and they were sealed in a glass capillary. Experimental densities were determined by the flotation in bromobenzene/dibromoethane mixture.The isomorphism of lanthanide salts is well known and a comparison of the geometry of crystal lattices shows that crystals of lanthanide(III) 2-furancarboxylates hydrates belong to two isostructural series (except Lu). The first series includes the dihydrated complexes of La, Ce and Pr which
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