SYNTHESIS AND CHARACTERIZATION OF HOLMIUM COMPLEXES CONTAINING BETA-DIKETONATE LIGANDS

Two holmium beta-diketonate complexes, Ho(hfa)(3)(H2O)(2) (1) and [Ho( hfa)(3)(H2O)(2)](triglyme) (2), have been prepared and characterized b y IR, TGA, and single-crystal X-ray analyses. These complexes show pol ymeric chains by the intermolecular hydrogen bondings. The donor atoms of the intermolecular hydrogen bonding in both complexes are hydrogen atoms of the coordinated water molecules. The acceptor atoms in 1 are the carbonyl oxygen atoms of beta-diketonate ligands whereas those in 2 are oxygen atoms of the triglyme ligand. While compound 1 decompose s cleanly to Ho2O3, compound 2 sublimes intact. Crystal data for 1 and 2 are as follows: Ho(hfa)(3)(H2O)(2) triclinic P (1) over bar, a=10.1 58(4), b=11.628(2), c=12.579(6) Angstrom, alpha=67.02(3)degrees, beta= 73.95(4)degrees, gamma=76.12(2)degrees, V=1299.8(8) Angstrom(3). [Ho(h fa)(3)(H2O)(2)](triglyme), monoclinic P2(1)/c, a=12.559(3), b=19.111(2 ), c=16.789(6) Angstrom, beta=110.59(4)degrees V=3772(2) Angstrom(3).