Synthesis and X-ray crystal structure of cationic polynuclear hydroxide acetylacetonate lanthanide(III) clusters with homodinuclear or heterodinuclear decacarbonyl hydrides: [HMo2(CO)10](-) and [HCrW(CO)(10)](-)

The synthesis and characterization of new polynuclear lanthanide(III) ionic clusters of general formula [Lng(acac)(16)(OH)(10)](+) [Mo-2(CO)(10)(mu-H)](-) (Ln=Sm,Eu, Gd, Dy, Yb) and [Sm-9(acac)(16)(OH)(10)](+) [CrW(CO)(10)(mu-H)](-) is reported. The polymuclear complexes, prepared under pure nitrogen atmosphere by interaction of the hydridic metal carbonyls with the beta-dichetonate Ln(acac)(3)(.)3H(2)O (Ln= Sm, Eu, Gd, Dy, Yb). The new clusters were characterized by elemental analysis, complexometric titration for Ln, atomic absorption for Cr, W and Mo, gas-volumetric analysis for CO, FTIR spectroscopy and single crystal X-ray structure determination of [Sm-9(acac)(16)(OH)(10)][Mo-2(CO)(10)(mu-H)]. The Eu and Yb complexes are isostructural to the Sm one for which, similarly to their homonuclear chromium and tungsten derivative analogues, a square antiprismatic arrangement of eight Sm ions with the ninth at the center of the antiprism has been found