Synthesis, structure and luminescence properties of new rare earth metal complexes with 1-phenyl-3-methyl-4-acylpyrazol-5-ones

The isolation and characterization of new lanthanide complexes of formula [Ln(Q(L))(3)(EtOH)(H2O)], (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, HQ(L) = 1-phenyl-3-methyl-4-phenylacetylpyrazol-5-one) [Ln(Q(L))(3)(H2O)(2)] (L = La or Lu), [Ln(Q(S))(3)(EtOH)(H2O)] (Ln = Tb or Eu; HQ(s) = 1-phenyl-3-methyl-4-thienoylpyrazol-5-one, [Tb(Q(o))(3)(EtOH)(H2O)] (HQ(o) = 1-phenyl-3-methyl-4-furanoylpyrazol-5-one) [Tb(Q(F))(3)(H2O) (HQ(F) = 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one) and [NBu4][Ln(Q)(4)] (Ln = Eu or Tb, Q = Q(F) or Q(L)) is reported. The crystal structure of the tris(beta-diketonate) complexes [Nd(Q(L))(3)(EtOH)(H2O)], [Dy(Q(L))(3)(EtOH)(H2O)](EtOH), and [Eu(Q(s))(3)(H2O)(EtOH)] containing eight-coordinate lanthanide ions in a square antiprismatic environment has been determined. The coordination environment in the tetrakis complex [NBu4][Eu(Q(F))(4)] is also close to the square antiprismatic one. Photoluminescence (PL) and phosphorescence studies of selected derivatives are reported.