Decomposition and Cycloaddition Reactions of hfacac, and Syntheses and Structures of LnIII2(hfacac)4(bdmap)2(H2O)2(THF)2, LnIIICuII(bdmapH)2(hfacac)2(O2CCF3)L, and LnIIICuII2(hfacac)(bdmap)3(O2CCH3)2(O2CCF3)(hfacacH) (Ln = Y, Pr, Nd; hfacac = hexafluoroacetylacetonato; bdmap = 1,3-bis(dimethylamino)-2-propanolato; L = 2-methyl-2,4,6-tris(trifluoromethyl)-1,3-dioxane-4,6-diolato)