ABSORPTION, LUMINESCENCE AND CRYSTAL-STRUCTURE STUDIES OF DYSPROSIUM COMPOUND WITH L-ALPHA-ALANINE - [DY(L-ALPHA-ALAH)(H2O)6]CL3

The dysprosium compound with L-alpha-Alamine of the formula [Dy(L-alpha-AlaH)-H2O)6]Cl3 was obtained from a water solution in the form of single monoclinic crystals with space group P2(1). Distribution of atoms in the structure of Dy(L-alpha-AlaH)(H2O)6]Cl3 is rather close to that of the pseudo P2(1)/c group. The other parameters were as follows: a = 8.459(3) angstrom, b = 15.719(4) angstrom, c = 11.518(3) angstrom, beta = 102.11(3)-degrees, V = 1497.4 angstrom-3, Z = 4, d(m) = 2.08 g cm-3, d(c) = 2.07 g cm-3, mu-(MoK-alpha) = 5.22 mm-1, lambda = 0.71069 angstrom, F(000) = 900 and T = 299 K. The structure consists of a polymeric chain with oxygen bridges fastening the linear polymer running along the c-axis. The final R factor was 0.026 for 2586 reflections. Each dysprosium ion is coordinated by two carboxylate oxygens and six oxygens from water molecules. The absorption spectrum in the region 5500-40 000 cm-1 was recorded along the a-axis and the probabilities of f-f transitions were analysed on the basis of the Judd-Ofelt theory. Solid state fluorescence spectra were recorded at 77 and 300 K and compared with all known dysprosium carboxylates data.