Shul’gin, V. F., Konnik, O. V., Abkhairova, S. V., Gusev, A. N., Meshkova, S. B., Kiriyak, A. V., Rusanov, E. B., Hasegawa, M., & Linert, W. (2013). Anionic lanthanide complexes with 3-methyl-1-phenyl-4-formylpyrazole-5-one and hydroxonium as counter ion. Inorganica Chimica Acta, 402, 33–38. https://doi.org/10.1016/j.ica.2013.03.044
A series of [H3O]+[LnL4]-⋅nH2O complexes (n = 1-3, Ln = Nd, (1), Sm (2), Eu (3), Tb (4); HL = 3- methyl-1-phenyl-4-formylpyrazole-5-one) were synthesized and characterized. The structures of the SmIII and EuIII complexes were investigated by X-ray diffraction. The isostructutal crystalls 2 and 3 consist the tetrakis [LnL4]- anions which are linked by H-bonding with the hydroxonium counter- ion and water molecules. The lanthanide ion is situated in the center of distorted tetragonal antiprism formed by eight oxygen atoms of 4-formyl-5-hydroxypyrazolonate anions. The TbIII and SmIII complexes show strong luminescence in solid state, whereas the EuIII and NdIII complexes show low luminescence activity.